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BILLING CODE 4510–26–C 
(B) Statement of the need for, and 
objectives of, the rule. 
The HCS is the cornerstone of OSHA’s 
risk mitigation strategy for controlling 
hazardous chemicals in the workplace. The importance of hazard communication in general and the HCS specifically have been well established over the past few decades, ever since OSHA first established the HCS in 1983 as a worker’s ‘‘right to know’’ standard (OSHA Publication 3021—Workers’ Rights, 2017). However, even prior to OSHA’s promulgation of the HCS, there was recognition that workers needed to know the hazards encountered in the workplace and the importance of communicating, classifying, and training about how to address those 
hazards. 
The foundational goal of the HCS is 
to identify, understand, and communicate the hazards associated with exposure to chemicals before workers experience chronic exposure to those hazards. For further discussion on 
the need for this revision to the HCS, see Section IV., Need and Support for the Revised Hazard Communication Standard, earlier in this preamble. 
(C) The response of the agency to any 
comments filed by the Chief Counsel for Advocacy of the Small Business Administration in response to the proposed rule, and a detailed statement of any change made to the proposed rule in the final rule as a result of the 
comments. 
No comments were filed by the Chief 
Counsel for Advocacy of the SBA in response to the proposed rule. 
(D) A statement of the significant 
issues raised by the public comments in 
response to the initial regulatory flexibility analysis, a statement of the assessment of the agency of such issues, and a statement of any changes made in the proposed rule as a result of such comments. 
Significant issues raised by public 
comments in relation to the PEA were addressed earlier in this FEA, within discussion of the preliminary cost analysis and revisions (if any) to the 
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preliminary cost analysis in response to 
public comments. 
(E) A description of and an estimate 
of the number of small entities to which the rule will apply or an explanation of why no such estimate is available. 
As shown above in Table VI–2, OSHA 
estimates that 114,585 establishments within 106,017 private (business) firms/ enterprises defined as small by the SBA will be affected by the final rule. 
As shown above in Table VI–3, OSHA 
estimates that 84,754 very small establishments (fewer than 20 employees) within 83,952 private (business) firms/enterprises identified as very small will be affected by the final rule. 
(F) A description of the projected 
reporting, recordkeeping and other compliance requirements of the rule, 
including an estimate of the classes of small entities which will be subject to the requirements and the type of professional skills necessary for preparation of the report or record. 
This final standard revises the HCS 
by, among other things, updating the criteria for classification of certain chemical and physical hazards, simplifying the requirements for providing updated labels and labels for small containers, strengthening the awareness of hazard information related to the contents of SDSs, and modernizing definitions. The preamble to the final standard provides a comprehensive description of, and further detail regarding, the compliance requirements of the rulemaking. 
Small business enterprises in Mining, 
Quarrying, and Oil and Gas Extraction, Manufacturing, and Wholesale Trade who import, produce, distribute, or otherwise come into contact with hazardous chemicals will be subject to the requirements of the final standard. For details on the affected NAICS industries and the number of affected small business enterprises (firms), see Section VI.C., Profile of Affected Industries, Establishments, and Employees in this FEA. 
All affected establishments must have 
a written hazard communication program explaining how the establishment meets the criteria of the standard with respect to labeling, SDSs, and worker information and training as discussed under paragraph (e) of the standard. 
Chemical manufacturers and 
importers must evaluate chemicals produced in their workplaces or imported by them to classify the chemicals in accordance with the standard. For each chemical, the chemical manufacturer or importer must determine the hazard classes, and, where appropriate, the category of each class that apply to the chemical being classified. Employers are not required to classify chemicals unless they choose not to rely on the classification performed by the chemical manufacturer or importer for the chemical to satisfy this requirement. A description of the types of entities subject to the new and revised requirements, and the types of professional skills necessary for compliance with the requirements, is presented in the relevant sections of this economic analysis; the corresponding unit time burdens are summarized 
below. These costs would apply only to 
those businesses not already in compliance with the revisions. 
Costs associated with chemical 
reclassifications and related revisions to safety data sheets and labels; Health and Safety Specialist, fully loaded hourly wage of $61.18: 
•Medium establishments (100–499 
employees): an average of 1.5 hours per 
SDS, 
•Small establishments (1–99 
employees): an average of 2.1 hours per 
SDS. 
Costs associated with revisions to 
appendix language on precautionary statements and other mandatory language; Health and Safety Specialist: 
•Medium establishments (100–499 
employees): an average of 0.5 hours per 
SDS, 
•Small establishments (1–99 
employees): an average of 0.7 hours per 
SDS. 
Costs associated with management 
familiarization with the revisions to the HCS; Health and Safety Specialist: 
•Medium directly affected 
establishments (20–499 employees): an 
average of 4.0 hours per establishment, 
•Medium indirectly affected 
establishments (20–499 employees): an 
average of 1.0 hours per establishment, 
•Small directly affected 
establishments (1–19 employees): an 
average of 1.0 hours per establishment, 
•Small indirectly affected 
establishments (1–19 employees): an 
average of 0.25 hours per establishment. 
Training costs associated with the 
revisions to the HCS; Mining, Quarrying, and Oil and Gas Extraction, and Manufacturing Sectors, per affected firm: 
•2.5 hours, Health and Safety 
Specialist, fully loaded hourly wage of $61.18; 
•0.2 hours, Logistics Personnel, fully 
loaded hourly wage of $60.37; 
•0.2 hours, Production Worker, fully 
loaded hourly wage of $31.09. 
Cost savings associated with the 
released-for-shipment provision, small firms in fertilizer and paint 
manufacturing, and small wholesalers of related farm and paint supplies: 
•Percentage loss avoided ranging 
from 0.009 percent to 0.025 percent, 
applied to average product value. 
Cost savings associated with 
abbreviated labels on very small 
containers, small firms in six manufacturing industries within NAICS 325—Chemical Manufacturing: 
•Cost savings of $0.058 per label for 
very small containers multiplied by the number of affected labels. 
(G) A description of the steps the 
agency has taken to minimize the significant economic impact on small entities consistent with the stated objectives of the applicable statutes, including a statement of the factual, policy, and legal reasons for selecting the alternative adopted in the final rule and why each one of the other significant alternatives to the rule considered by the agency which affect the impact on small entities was rejected. 
As was the case with the 2012 HCS, 
OSHA in this final rule has published an implementation schedule (paragraph (j) Dates) that minimizes the impacts on small employers. The final rule requires that chemical manufacturers, importers, and distributors, and employers evaluating substances be in compliance with all modified provisions of the HCS no later than eighteen months after the effective date of the final rule 
(paragraph (j)(2)(i)) and that chemical manufacturers, importers, and distributors, and employers evaluating mixtures must be in compliance with all modified provisions of the HCS no later than thirty-six months after the effective date of the final rule (paragraph (j)(3)(i)). Finally the final rule requires that all employers, as necessary, update any alternative workplace labeling used under paragraph (f)(6) of this section, update the hazard communication program required by paragraph (h)(1), and provide any additional employee training in accordance with paragraph (h)(3) for newly identified physical hazard, or health hazards or other hazards covered under this section no later than twenty-four months after the effective date of the final rule for substances and forty-two months after the effective date for mixtures (paragraphs (j)(2)(ii) and (j)(3)(ii)). 
Taking into consideration all of the 
information received from the public during the comment periods and in hearing testimony, as well as the results of the economic analysis that examine the effects of different compliance dates on the overall costs of compliance, OSHA believes the implementation 
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schedule published in this final rule 
sets a proper balance between employee safety and the economic interests of small business enterprises. 
VII. OMB Review Under the Paperwork 
Reduction Act of 1995 
A. Overview 
OSHA is publishing a final rule to 
revise the HCS, 29 CFR 1910.1200, 
which contains collections of information that are subject to review by OMB under the Paperwork Reduction Act of 1995 (PRA), 44 U.S.C. 3501 et 
seq., and OMB regulations at 5 CFR part 
1320. This rule is revising and updating the existing previously approved paperwork package under OMB control number 1218–0072. 
The PRA defines collection of 
information to mean ‘‘the obtaining, 
causing to be obtained, soliciting, or requiring the disclosure to third parties or the public of facts or opinions by or for an agency regardless of form or format.’’ 44 U.S.C. 3502(3)(A). Under the PRA, a Federal agency cannot conduct or sponsor a collection of information unless OMB approves it and the agency displays a currently valid OMB control number (44 U.S.C. 3507). Also, notwithstanding any other provision of law, no employer shall be subject to penalty for failing to comply with a collection of information if the collection of information does not display a currently valid OMB control number (44 U.S.C. 3512). 
On February 16, 2021, OSHA 
published an NPRM (86 FR 9576) to modify the HCS to align with Rev. 7 (Document ID 0060), to address issues that arose during the implementation of the 2012 update to HCS, and to better align with other U.S. agencies and international trading partners, while improving the effectiveness of the standard. The NPRM proposed to revise the OMB-approved information collection requirements contained in the HCS. Specifically, OSHA proposed to (1) clarify that under paragraph (d)(1) the chemical manufacturer or importer must determine for each chemical the hazard classes, and where appropriate, the category of each class, that apply to the chemical being classified under normal conditions of use and foreseeable emergencies; (2) add language to paragraph (f)(1) requiring that the chemical manufacturer, importer, or distributor ensure labels on shipped containers bear the date the chemical is released for shipment; (3) revise paragraph (f)(5) by adding two new provisions related to bulk shipments of chemicals; (4) revise paragraph (f)(11) by adding a provision related to release for shipment that 
allows chemical manufacturers, importers, and distributors to provide updated labels with each shipment instead of relabeling; and (5) add new provisions allowing more limited labeling for small containers in paragraph (f)(12). On February 16, 2021, the agency prepared and submitted to OMB an Information Collection Request (ICR) for the 2021 proposed rule for review in accordance with 44 U.S.C. 3507(d). 
B. Solicitation of Comments 
In accordance with the PRA (44 
U.S.C. 3506(c)(2)), OSHA solicited 
public comments on the collection of 
information contained in the NPRM. 
OSHA encouraged commenters to submit their comments on the information collection requirements contained in the proposed rule under docket number OSHA–2019–0001, along with their comments on other parts of the proposed rule. In addition to generally soliciting comments on the collection of information requirements, the proposed rule indicated that OSHA and OMB were particularly interested in comments that addressed the following: 
•Whether the proposed collections of 
information are necessary for the proper performance of the functions of the agency, including whether the 
information is useful; 
•The accuracy of the OSHA’s 
estimate of the burden (time and cost) 
of the proposed collection of information, including the validity of the methodology and assumptions used; 
•The quality, utility, and clarity of 
the information to be collected; and 
•Ways to minimize the compliance 
burden on regulated entities, including through the use of appropriate automated or other technological techniques for collecting and transmitting information. 
On August 4, 2021, OMB issued a 
Notice of Action (NOA) stating, ‘‘Terms of the previous clearance remain in effect. Prior to publication of the final rule, the agency should provide to OMB a summary of all comments received on the proposed information collection and identify any changes made in response to these comments’’ (see https://
www.reginfo.gov/public/do/PRAViewICR?ref_ nbr=202102-1218- 
002). 
The agency received numerous public 
comments in response to the NPRM during the initial comment period. In addition, OSHA held public hearings on the proposal from September 21–23, 2021, where the agency heard testimony from stakeholders (see Document ID 0423; 0424; 0425). Participants who filed notices of intention to appear at 
the hearing were permitted to submit additional evidence and data relevant to the proceedings for a period of 60 days following the hearing. The record remained open for the submission of final briefs, arguments, and summations until December 22, 2021. OSHA received additional post-hearing comments. 
OSHA received one comment from 
Ameren specifically on the proposed ICR, which stated that they agree with the collection of information 
requirements listed in Table 1— Collection of Information Requirements Being Revised in the Hazard Communication Standard in the NPRM, although they noted that ‘‘[t]his does not necessarily indicate that Ameren agrees with these as a change to the HCS’’ (Document ID 0309, p. 3). 
The comments submitted in response 
to the rest of the proposed rule and the hearing proceedings resulted in modifications to the provisions containing collections of information. OSHA considered these responses and resulting modifications when preparing the revised ICR for the final rule. Summaries of comments received on the NPRM and OSHA’s responses are found in Sections VI., Final Economic Analysis and Regulatory Flexibility Analysis, and Section XIV., Summary and Explanation of the Final Rule, in this preamble. 
OSHA submitted the final ICR 
concurrent with the publication of this final rule, containing the full analysis and description of the burden hours and costs associated with the final rule, to OMB for approval. A copy of this ICR will be available to the public at http:// 
www.reginfo.gov/public/do/
PRAViewICR?ref _nbr=202002-1218-002 
(this link will become active on the day following publication of this notice). At the conclusion of OMB’s review, OSHA will publish a separate notice in the Federal Register to announce the results. 
C. Summary of Information Collection 
Requirements 
As required by 5 CFR 1320.5(a)(1)(iv) 
and 1320.8(d)(2), the following paragraphs provide information about the ICR. 
1. Title: Hazard Communication 
Standard (29 CFR 1910.1200). 
2. Description of the ICR: The final 
rule revises the currently approved Hazard Communication ICR and changes the existing collection of information requirements currently approved by OMB. 
3. Brief Summary of the Information 
Collection Requirements: 
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This final rule revises and clarifies the 
collection of information contained in 
the existing ICR. Specifically, OSHA is (1) modifying the language in paragraph (d)(1) to clarify what hazards are required to be classified; (2) adding language to paragraph (f)(1) providing that hazards identified and classified under subparagraph (d)(1)(ii) do not have to be addressed on labels of shipped containers; (3) revising paragraph (f)(5) by adding two new provisions related to bulk shipments of chemicals; (4) revising paragraph (f)(11) to include a provision that adds flexibility related to updating labels for products already released for shipment; (5) adding paragraph (f)(12) to provide new labeling requirements for small containers; (6) clarifying the language in paragraph (g)(2); and (10); and (7) adding language in paragraph (i) to include requirements for how concentrations and concentration ranges can be claimed as trade secrets on SDSs. See Table VII.1. 
BILLING CODE 4510–26–P 
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BILLING CODE 4510–26–C 
1. OMB Control Number: 1218–0072. 
2. Affected Public: Business or other 
for-profit. 
3. Number of Respondents: 5,580,906. 
4. Frequency of Responses: Varies. 
5. Number of Reponses: 98,762,005. 
6. Average Time per Response: Varies. 
7. Estimated Annual Total Burden 
Hours: 7,206,569. 
8. Estimated Annual Total Cost 
(Operation and maintenance): 
$69,207,596. 
VIII. Federalism 
OSHA reviewed this final rule 
according to the Executive Order on 
Federalism (E.O. 13132, 64 FR 43255, Aug. 10, 1999), which requires that Federal agencies, to the extent possible, refrain from limiting State policy options, consult with States before taking actions that would restrict State policy options, and take such actions only when clear constitutional and statutory authority exists and the problem is of national scope. E.O. 13132 permits preemption of State law only as provided by Congress or where State law conflicts with Federal law. Federal agencies must limit preemption of State law to the minimum level necessary to 
achieve the objectives of the statute pursuant to which the regulations are promulgated. 
Under section 18 of the OSH Act, 29 
U.S.C. 667, Congress expressly provides 
that States and U.S. territories may adopt, with Federal approval, a plan for the development and enforcement of occupational safety and health standards. OSHA refers to States that obtain Federal approval for such OSHA- approved occupational safety and health plans as ‘‘State Plans.’’ Occupational safety and health standards developed by State Plans must be at least as effective in providing safe and healthful employment and places of employment as the Federal standards and, when applicable to products that are distributed or used in interstate commerce, must be required by compelling local conditions and not unduly burden interstate commerce. 29 U.S.C. 667(c)(2). Subject to these requirements, State Plans are free to develop and enforce under State law their own occupational safety and health standards. In States without OSHA-approved 
State Plans, Congress expressly provides 
for OSHA standards to preempt State occupational safety and health standards in areas addressed by the Federal standards. In these States, this final rule limits State policy options in the same manner as every standard promulgated by OSHA. In States with OSHA-approved State Plans, this final rule does not significantly limit State policy options to adopt equally effective or stricter standards. 
OSHA previously concluded that 
promulgation of the HCS complies with E.O. 13132 (77 FR 17687) and reaffirms that finding with respect to this final rule. 
IX. State Plans 
When Federal OSHA promulgates a 
new standard or more stringent 
amendment to an existing standard, OSHA-approved State Plans must either amend their standards to reflect the new standard or amendment or show OSHA why such action is unnecessary, e.g., 
because an existing State standard 
covering this area is ‘‘at least as effective’’ as the new Federal standard or amendment. 29 CFR 1953.5(a). State 
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Plans must adopt the Federal standard 
or complete their own standard within six months of the promulgation date of the final Federal rule. 
The 22 States and territories with 
OSHA-approved occupational safety and health plans that cover public and private-sector employees are Alaska, Arizona, California, Hawaii, Indiana, Iowa, Kentucky, Maryland, Michigan, Minnesota, Nevada, New Mexico, North Carolina, Oregon, Puerto Rico, South Carolina, Tennessee, Utah, Vermont, Virginia, Washington, and Wyoming. Another seven states and territories have OSHA-approved occupational safety and health plans that cover State and local government employees only: Connecticut, Illinois, Maine, Massachusetts, New Jersey, New York, and the Virgin Islands. 
This final rule updates the HCS to 
conform with updates to the GHS, improve alignment with other U.S. agencies and international trading partners, and address certain implementation concerns. This rule will increase worker protection by improving the quality and consistency of information provided to employers and employees regarding chemical hazards and protective measures. 
OSHA received one comment relevant 
to the relationship between State Plans and Federal OSHA from the California Department of Public Health/Hazard Evaluation System and Information Service (Cal/HESIS). Cal/HESIS proposed that State Plans such as California be allowed to require manufacturers that sell chemicals in their states or territories to classify chemicals as carcinogens or reproductive or developmental toxicants when the chemical is listed as such by a state or territory body (such as California’s Prop 65 list) and disclose this information on SDSs (Document ID 0313, p. 8). OSHA disagrees with this suggestion. As the agency discussed regarding State Plan amendments to their hazard communication standards in the 2012 HCS ‘‘OSHA intends to closely scrutinize amendments to previously approved State hazard communication standards submitted under current or future State plans to ensure equal or greater effectiveness, including assurance that any additional requirements do not conflict with, or 
adversely affect, the effectiveness of the national application of OSHA’s standard. OSHA must also determine in its review whether any State plan standard provisions that differ from the Federal provisions, when applicable to products distributed or used in interstate commerce, are ‘‘required by compelling local conditions and do not unduly burden interstate commerce.’’ OSH Act section 18(c), 29 U.S.C. 667(c).’’ (77 FR 17687). 
The key benefit in aligning the HCS 
with the GHS in 2012 was to provide a uniform and consistent method for classification and dissemination of the information on the label and the SDS (77 FR 17605). Allowing states to develop their own classification criteria, which could lead to vastly different and potentially contradictory information on the labels, would diminish and eliminate significant portions of those 
benefits. In 2012 stakeholders agreed 
that a dual system would undermine the benefits of aligning with the GHS (77 FR 17583). OSHA also finds that if State Plans were allowed to require different elements on labels and SDSs from state to state that this could disrupt and unduly burden interstate commerce as it could mean that manufacturers would need to develop different labels and SDSs depending upon the state. Therefore, State Plans must adopt comparable provisions within six months of publication of the final rule. 
X. Unfunded Mandates Reform Act 
OSHA reviewed this final rule 
according to the Unfunded Mandates 
Reform Act of 1995 (UMRA), 2 U.S.C. 1501 et seq., and E.O. 13132 (64 FR 
43255, Aug. 10, 1999). As discussed above in Section VI., Final Economic Analysis and Regulatory Flexibility Analysis, OSHA has concluded that this final rule will not impose a Federal mandate on the private sector in excess of $100 million (adjusted annually for inflation) in expenditures in any one year. 
As noted above in Section IX., State 
Plans, OSHA’s standards do not apply to State and local governments except in States that have elected voluntarily to adopt a State Plan approved by the agency. Consequently, this proposal 
does not meet the definition of a 
‘‘Federal intergovernmental mandate.’’ 
See 2 U.S.C. 658(5). 
For the reasons discussed above in 
Section VI., Final Economic Analysis 
and Regulatory Flexibility Analysis, the changes to the HCS would not require tribal governments to expend, in the aggregate, $100 million or more in any one year for their commercial activities. 
Therefore, for the purposes of the 
UMRA, OSHA certifies that this final rule would not mandate that State, local, or tribal governments adopt new, unfunded regulatory obligations of, or increase expenditures by the private sector by, more than $100 million in any year. XI. Protecting Children From Environmental Health and Safety Risks 
E.O. 13045 (62 FR 19885, Apr. 23, 
1997), requires that Federal agencies 
submitting covered regulatory actions to OMB’s Office of Information and Regulatory Affairs (OIRA) for review pursuant to E.O. 12866 provide OIRA with (1) an evaluation of the environmental health or safety effects that the planned regulation may have on children, and (2) an explanation of why the planned regulation is preferable to other potentially effective and reasonably feasible alternatives considered by the agency. E.O. 13045 defines ‘‘covered regulatory actions’’ as rules that are likely to (1) be economically significant under E.O. 12866 (now amended by E.O. 14094) (i.e., a rulemaking that has an annual 
effect on the economy of $200 million 
or more, or would adversely affect in a material way the economy, a sector of the economy, productivity, competition, jobs, the environment, public health or safety, or State, local, or tribal governments or communities), and (2) concern an environmental health risk or safety risk that an agency has reason to believe may disproportionately affect children. In this context, the term ‘‘environmental health risks and safety risks’’ means risks to health or safety that are attributable to products or substances that children are likely to come in contact with or ingest ( e.g., 
through air, food, water, soil, or product use). 
OIRA has determined that this final 
rule is not significant under Section 3(f)(1) of E.O. 12866, as amended (see Section VI., Final Economic Analysis and Regulatory Flexibility Analysis) and that the environmental health and safety risks addressed through this final rule do not present a disproportionate risk to children as set forth in E.O. 13045. 
XII. Environmental Impacts 
OSHA has reviewed this final rule 
according to the National 
Environmental Policy Act of 1969 (NEPA) (42 U.S.C. 4321 et seq.), the 
regulations of the Council on Environmental Quality (40 CFR part 1500), and DOL’s NEPA procedures (29 CFR part 11). In the NPRM, OSHA preliminarily determined that the proposed regulatory changes would have no impact on air, water, or soil quality; plant or animal life; or the use of land or aspects of the external environment and thus would have no significant environmental impacts (86 FR 9687). No commenter challenged this determination. Based on its review of the final rule, OSHA has determined 
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54Comments regarding specific adoption of 
particular provisions are discussed in the 
appropriate sections of the Summary and Explanation. that the regulatory changes will have no 
impact on air, water, or soil quality; plant or animal life; the use of land; or aspects of the external environment and the final rule will therefore have no significant environmental impact. 
XIII. Consultation and Coordination 
With Indian Tribal Governments 
OSHA reviewed this final rule in 
accordance with E.O. 13175 (65 FR 67249, Nov. 6, 2000) and determined that it does not have tribal implications as defined in that order. The final rule will not have substantial direct effects on one or more Indian tribes, on the relationship between the Federal government and Indian tribes, or on the distribution of power and responsibilities between the Federal government and Indian tribes (see E.O. 13175 § 1(a)). 
XIV. Summary and Explanation of the 
Final Rule 
This section of the preamble explains 
OSHA’s changes to the HCS (29 CFR 
1910.1200). OSHA proposed to align this update of the HCS with the GHS Rev. 7 (Document ID 0060), where appropriate. The agency had preliminarily decided to base most of the GHS alignment on Rev. 7 for several reasons, even though Rev. 8 was issued in July 2019 (Document ID 0065). First, OSHA had preliminarily determined that there were sufficient significant updates to the GHS to warrant the initiation of the rulemaking process and OSHA began its work to update the standard prior to the release of Rev. 8. Second, the U.S.’s major trading partners (including Canada, Europe, and Australia) have or are preparing to align with Rev. 7 (Document ID 0172; Document ID 0168; Document ID 0176). While the proposal was largely based on Rev. 7, OSHA asked for comment on adopting some of the most consequential changes from Rev. 8 in the Issues and Options section (86 FR 9691–9694). 
In addition, OSHA proposed several 
changes that were unrelated to alignment with the GHS but were intended to address specific issues that have arisen since the 2012 rulemaking to revise the HCS and to provide better alignment with international trading partners, without lowering the protections provided by the standard. 
OSHA received numerous comments 
on which GHS revision to align with in this rulemaking and received overwhelming support from commenters for its proposal to update to Rev. 754
54(See, e.g., Document ID 0293, 
p. 1; 0327, pp. 1–2; 0359, p. 7; 0339, p. 
1; 0323, p. 1; 0281, Att. 2, p. 2; 0358, p. 2). The most prevalent reasons given for supporting the update to Rev. 7 were better alignment with international trading partners, especially Health Canada’s HPR, and improvements in hazard communications such as updating and adding additional hazard classes with the updates to the GHS. Specifically, Givaudan and the Household & Commercial Products Association (HCPA) supported alignment with Rev. 7 in order to increase consistency between OSHA’s HCS and Health Canada’s HPR (Document ID 0293, p. 1; 0327, pp. 1– 2). Similarly, Dow Chemical (Dow) supported alignment with Rev. 7 on the basis that OSHA’s proposed update would improve alignment with major trading partners (Document ID 0359, p. 7). Hach and the Dangerous Goods Advisory Council (DGAC) also supported the update to Rev. 7 to better align with trading partners (Document ID 0323, p. 1; 0339, p. 1). 
Only two commenters objected to 
OSHA’s proposal to align with Rev. 7. Toby Threet stated that OSHA should not adopt Rev. 7 because the agency should strive to align as closely as possible with other countries in order to meet the goal of GHS harmonization and argued that OSHA has not shown that the majority of other countries have aligned with Rev. 7, both because (1) at the time OSHA issued the NPRM several countries were preparing to align with Rev. 7 but had not yet (Canada, Europe, Australia, and New Zealand) and (2) OSHA failed to consider whether this would align with other, potentially more major, trading partners (such as China, Russia, Brazil, and India) (Document ID 0279, pp. 1–2). 
OSHA disagrees with this comment. 
As indicated in the NPRM, Canada, Europe, Australia, and New Zealand all announced their intention to update their regulations to Rev. 7 (86 FR 9694). The U.S.’s closest trading partner, Canada, updated the HPR to align with Rev. 7 on January 4, 2023 (see https:// 
www.canada.ca/en/health-canada/ 
services/environmental-workplace- health/occupational-health-safety/ workplace-hazardous-materials- information-system/amendments- hazardous-products-regulations.html), and the European Union (EU) updated its Classification, Labelling, and Packaging (CLP) regulation in 2023 as well (see https://echa.europa.eu/new- 
hazard-classes-2023). OSHA works diligently with our UN partners through the UNSCEGHS to address stakeholder concerns regarding the timing of updates across U.S. international trading partners. However, given the lengthy and complex process of regulatory development, exact timelines are difficult to manage. Nevertheless, 
OSHA does not believe that there will 
be meaningful differences in timing of updates between the international trading partners as OSHA’s compliance deadline will allow stakeholders extended time to comply with the updated standard. The compliance dates for the HCS are discussed in more detail in the Summary and Explanation for paragraph (j). 
Additionally, Brazil and Russia are 
currently in the process of aligning with Rev. 7, further indicating that this is the correct revision for OSHA to align with. China is using the fourth version of the GHS and therefore is currently not aligned with OSHA’s HCS. India has not yet implemented the GHS and does not participate at the UNSCEGHS. OSHA does not believe it is acceptable to postpone its rulemaking until all trading partners, particularly those that have never adopted the GHS, adopt Rev. 7 as this would result in OSHA not updating the HCS for an indefinite period of time, meanwhile depriving U.S. workers of these important protections. While OSHA strives to align with major trading partners that are similarly committed to maintaining a harmonized GHS system where possible, the agency’s primary mission is to protect workers. 
ASSP also stated that OSHA should 
not align with GHS Rev. 7. They suggested that the agency should align with Rev. 8 because it is a newer version (Document ID 0284, p. 1). ASSP went on to state that updating to Rev. 7 would result in OSHA continuing to play ‘catch-up’ since the European Union’s Registration, Evaluation, Authorisation, and Restriction of Chemicals (REACH) regulation is updated every two years. OSHA notes that currently Health Canada HPR and the EU CLP have updated to Rev. 7, so the agency does 
not agree that the United States is falling 
behind its trading partners (Document 
ID 0176; 0172). 
Other commenters expressed 
concerns about deviating from a single version of the GHS, either due to 
incorporating elements of another 
revision or due to incorporating 
elements that differed from the GHS 
altogether. Several commenters noted that they disapproved of selectively adopting elements of Rev. 8, and two of 
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these commenters noted that this was 
because selective adoption would cause misalignment with trading partners (Document ID 0323, p. 2; 0423, Tr. 105; 0359, p. 7; 0368, p. 11). However, Ameren noted that adopting specific provisions from Rev. 8 ‘‘could improve worker safety now in lieu of waiting until the next revision of the HCS’’ (Document ID 0309, p. 14). While OSHA strives to align with trading partners where possible, OSHA’s primary mission is to protect workers. Therefore, OSHA has concluded that some elements of Rev. 8 improve the safety of workers and the clarity of information being communicated and is adopting those provisions instead of their Rev. 7 equivalent. 
Other stakeholders indicated that 
OSHA should not include changes that are not included in the GHS. The International Carbon Black Association (ICBA) supported alignment with Rev. 7, but opposed adding the sections of the proposal, such as the requirement to classify hazards based on downstream use, that went beyond GHS obligations because they felt this would lead to misalignment with international trading partners (Document ID 0291, p. 6). ACC provided similar comments and stated that ‘‘we strongly urge OSHA to pull directly from the UN GHS wherever possible, while retaining flexibility for existing provisions that provide similar levels of protection’’ (Document ID 0347, p. 4). NAIMA supported aligning with the GHS, but noted that ‘‘[t]here are also proposals from OSHA that have nothing to do with the GHS but will create heavy and unprecedented burdens upon all industries subject to the HCS’’ and stated that they did not support such changes (Document ID 0338, p. 1). These commenters provided greater specificity about their opposition to specific proposals that differ from Rev. 7, and OSHA discusses these specific comments in detail in the corresponding sections in the Summary and Explanation below. 
OSHA received several comments 
asking the agency to completely withdraw the proposal or repropose it with significant changes due to concerns about the proposed rule decreasing worker protections (Document ID 0305, p. 1; 0312, p. 7; 0322, Att. 1, p. 1; 0344, p. 4; 0350, p. 1; 0354, p. 1). OSHA disagrees with the conclusion that this rule will decrease worker protections; as the agency has stated, and as discussed throughout the Summary and Explanation below, it expects this update of the HCS to improve worker safety by incorporating 
new hazard classes and categories, improving and streamlining precautionary statements, and providing 
additional clarification of existing regulatory requirements. Therefore, OSHA is moving forward with finalizing the update to the HCS in this rulemaking. To the extent these commenters raised concerns about worker safety with respect to specific provisions, those comments are addressed in their respective sections of 
the Summary and Explanation. 
Finally, OSHA received a variety of 
non-substantive comments pointing out 
minor errors such as missing punctuation or European spelling differences. OSHA has updated the regulatory text to incorporate these minor changes where appropriate, but does not discuss non-substantive edits in the Summary and Explanation below. 
A. Discussion of Incorporation by 
Reference 
OSHA is updating the agency’s 
incorporation by reference section, 29 CFR 1910.6, to include the national and international consensus standards listed below. Where OSHA has updated consensus standards, OSHA does not intend to require chemicals already classified using an earlier version of a consensus standard to be reclassified and has retained earlier versions of the consensus standards in the text of the standard where relevant to avoid suggesting retesting is necessary (for the U.N. Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, this is reflected in the use of a generic citation where either Rev. 4 or Rev. 6 is acceptable, and a specific citation to Rev. 6 where there is new material included and only Rev. 6 is acceptable to use). OSHA believes that requiring the reclassification of chemicals based on updated test methods could result in unnecessary economic impacts and create unnecessary confusion for stakeholders. OSHA had considered alternative ways to clarify this in the final regulatory text, for instance by including a provision in the 
DATES section of the rule stating that 
chemicals classified based on older test methods, prior to the effective date of the rule, do not need to be reclassified, and invited comments on this topic (86 
FR 9694). OSHA received one comment from Ameren on this issue (Document ID 0309, p. 14), which is addressed in the Summary and Explanation for Appendix B. OSHA has decided to not make the change to the 
DATES section 
but rather to retain references to the older versions of the consensus standards where relevant and has clarified this matter in the relevant portions of the Summary and Explanation for Appendix B. In the NPRM, OSHA requested 
comment on whether it should update 
all of the consensus standards and received no comments on that particular question. ASTM International (ASTM) submitted a comment indicating that they believe OSHA should, in the future, update all references to consensus standards in bulk through the Federal Register, as the Food and Drug Administration (FDA) does (Document ID 0307, pp. 2–3). OSHA has decided to only add or update the references that the agency proposed, rather than updating all existing references to consensus standards in the regulatory text and Appendix B, but will consider the approach suggested by ASTM in a future rulemaking. OSHA is finalizing the proposed references to the 
consensus standards as proposed with 
one exception: DOD pointed out that one of OSHA’s proposed citations to consensus standards was incorrect and OSHA has updated the reference 
throughout the final rule (Document ID 0299, p. 3). 
OSHA is finalizing its decision to 
incorporate by reference the materials below. Each standard is available for purchase through the publication agencies listed below. 
The following standards appear in the 
amendatory text of this document and were previously approved for appendix B to § 1910.1200: ASTM D56–05; ASTM D3278–96, ASTM D3828–07a, ASTM D93–08, ASTM D86–07a, ASTM D240– 02 (Reapproved 2007), ASTM D1078– 05, ISO 1056:1996(E) ISO 1056–2:2005, ISO 13943:2000(E/F), NFPA 30B, UN ST/SG/AC.10/Rev.4. 
•ADR 2019, European Agreement 
Concerning the International Carriage of Dangerous Goods by Road, Annex A, January 1, 2019. 
This standard describes test methods, 
units of measurement, definitions, and applicable standards and regulations for determining fluidity of liquids for classification purposes. 
ÆUnited Nations: https://
shop.un.org/product/18246?v=22452 r. 
•ASTM D 4359–90 (reapproved 
2019), Standard Test Method for Determining Whether a Material is a Liquid or a Solid, Approved July 1, 2019. 
This standard covers test methods 
used to determine whether a viscous material is a liquid or a solid for regulatory purposes and was developed under internationally recognized principles established in ‘‘Decision on Principles for the Development of International Standards, Guides and Recommendations’’ by the World Trade Organization Technical Barriers to Trade (TBT) Committee. The standard 
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only addresses test methods for the 
specified purpose of determining state of a material and is not intended to address all safety concerns associated with use of the material being tested. 
ÆASTM International: https://
astm.org/Standard/standards-and- publications.html. 
•DIN 51794:2003–05, Determining 
the ignition temperature of petroleum products, May 2003. 
This standard specifies test methods 
for determining the ignition temperature of flammable gases and liquids, as well as petroleum products and their mixtures at temperatures between 75 °C 
and 650 °C. The ignition temperature is a measurement of a flammable substance’s tendency to ignite when in contact with hot objects. The standard also provides guidance for classification purposes. 
ÆGerman Institute for 
Standardisation (DIN): https://din.de/ en/about-standards/buy-standards. 
•IEC 60079–20–1, Explosive 
atmospheres—Part 20–1: Material characteristics for gas and vapor classification—Test methods and data, Edition 1.0, 2010–01 This standard describes test methods for measurement of the maximum experimental safe gaps of a gas- or vapor- air mixture under normal conditions of temperature and pressure in order to make a determination of appropriate safety equipment as well as describes test methods for use in the determination of auto-ignition temperature of a chemically pure vapor or gas. This standard also provides guidance for classifying gases and vapors for explosive potential. 
ÆInternational Electrotechnical 
Commission (IEC): https://webstore.ansi.org/standards/iec/iec6007920ed2010. 
•ISO 817:2014(E), Refrigerants— 
Designation and safety classification, Third Edition, 2014–04–15. 
This standard provides guidance for 
determining the lowest temperature a substance can spontaneously ignite under normal atmospheric conditions without an external source of ignition, such as a spark or flame. The standard also provides guidance for classification of these materials for safety purposes. The standard was developed under internationally recognized principles established in ‘‘Decision on Principles for the Development of International Standards, Guides and Recommendations’’ by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 
ÆISO: https://iso.org/store.html. 
ÆISO 10156:2017(E), Gases and Gas 
Mixtures—Determination of Fire Potential and Oxidizing Ability for the Selection of Cylinder Valve Outlets, Fourth Edition, 2017–07. 
This standard provides test methods 
for determining the flammability of a gas or gas mixture and determining whether a gas or gas mixture is more or less oxidizing than air under atmospheric conditions. The standard also provides guidance for classifying gases or gas mixtures and for determining the appropriate selection of gas cylinder valve outlets. The standard was developed under internationally 
recognized principles established in 
‘‘Decision on Principles for the Development of International Standards, Guides and Recommendations’’ by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 
ÆInternational Organization for 
Standardization (ISO): https://iso.org/ store.html. 
•UN ST/SG/AC.10/11/Rev.6, UN 
Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, Sixth Revised Edition, copyright 2015. 
This standard provides test methods, 
classification procedures, and criteria for classification of explosives, self- reactive substances, organic peroxides, and other various hazards ( e.g., 
flammability of aerosols, desensitized explosives, flammable solids, liquids, oxidizing solids and liquids, corrosive to metals). 
ÆUnited Nations: https://unece.org/ 
info/Transport/Dangerous-Goods/pub/ 2581. 
OSHA is making all documents 
available for review by the public in accordance with the agency’s policies regarding availability of documents. Copies of the standards are available for purchase from the issuing organizations 
at the addresses or through the other 
publisher contact information listed in 
§ 1910.6 of the amendatory text in this 
document. In addition, these standards 
are available for inspection at any 
Regional Office of the Occupational Safety and Health Administration (OSHA), or at the OSHA Docket Office, U.S. Department of Labor, 200 Constitution Avenue NW, Room N– 3508, Washington, DC 20210; telephone: 202–693–2350 (TTY number: 877–889– 5627). Due to copyright issues, OSHA cannot post consensus standards on the OSHA website or through regulations.gov. 
B. Discussion of Regulatory Text (a) Purpose 
Paragraph (a)(1) of the HCS states that 
‘‘[t]he purpose of this section is to 
ensure that the hazards of all chemicals produced or imported are classified, and 
that information concerning the classified hazards is transmitted to employers and employees.’’ In the 2012 HCS, paragraph (a)(1) explained that the requirements of the standard were intended to be consistent with Rev. 3. The NPRM proposed to change the reference from Rev. 3 to Rev. 7. As stated in the introduction to the Summary and Explanation, revisions included in this final rule primarily serve to align the HCS with Rev. 7, with the exception of selected provisions which either align with Rev. 8 or do not relate to the GHS. OSHA is therefore finalizing paragraph (a)(1) to update the reference to the GHS to ‘‘Revision 7,’’ replacing ‘‘Revision 3.’’ In addition, OSHA is inserting ‘‘primarily’’ before ‘‘Revision’’ because the agency is finalizing some of the proposed changes from Rev. 8. 
(b) Scope and Application 
Paragraph (b) of the HCS specifies the 
scope and application of the rule, 
including the chemicals that are (and are not) covered by the standard. This final rule modifies paragraph (b)(6)(x) of the 2012 HCS, which excludes nuisance particulates from coverage under the HCS under certain circumstances. Specifically, OSHA is modifying paragraph (b)(6)(x) to clarify that nuisance particulates are excluded from the scope of the standard when the chemical manufacturer or importer can establish they do not pose any physical hazard, health hazard, or other hazards covered under the HCS. 
Paragraph (b)(6)(x) of the 2012 HCS 
stated that the standard does not apply to nuisance particulates ‘‘where the chemical manufacturer or importer can establish that they do not pose any physical or health hazard covered under this section.’’ However, this could be interpreted as excluding hazards not 
otherwise classified (HNOC), which is not OSHA’s intent. Therefore, in the NPRM OSHA proposed a slight revision to this provision to make clear that nuisance particulates are excluded if they do not pose any physical hazard, health hazard, or other hazards ( i.e., 
HNOC) covered by the standard (86 FR 9696). This proposed change was intended to clarify that all hazards covered by the standard must be considered when evaluating nuisance particulates. OSHA’s proposal did not alter the requirement, first adopted in 1994, that nuisance particulates are excluded if they pose no hazard. 
OSHA received no comments 
specifically regarding the addition of HNOC to this provision. However, OSHA received comments regarding 
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55The ‘‘burden of proof’’ provision to which 
USBSA et al. referred is located in 5 U.S.C. 556, 
which applies to federal agency hearings. See 5 U.S.C. 556(a). The provision states, in pertinent part, ‘‘Except as otherwise provided by statute, the proponent of a rule or order has the burden of proof.’’ 5 U.S.C. 556(d). paragraph (b)(6)(x) as a whole 
(Document ID 0325, pp. 12–13; 0397, pp. 12–13; 0279, p. 13). USBSA et al. commented that OSHA’s proposal to add ‘‘other hazards’’ to the existing text of paragraph (b)(6)(x) would ‘‘contravene the burden-of-proof provision of the Administrative Procedure Act, 5 U.S.C. 556(d)’’
55 
(Document ID 0325, pp. 12–13; 0397, pp. 12–13). USBSA et al. argued that OSHA’s proposed change would improperly place the burden of proof on manufacturers and importers to determine whether nuisance particulates present ‘‘other hazards’’ under the HCS, in order to meet the requirements of (b)(6)(x) for when nuisance particulates may be excluded from the scope of the HCS (Document ID 0325, p. 12). 
Similarly, Toby Threet commented 
that paragraph (b)(6)(x) requires the manufacturer or importer to establish the absence of a hazard and suggested that OSHA should revise the paragraph to exclude nuisance particulates where the chemical manufacturer or importer can establish that they are not classified 
as a physical hazard, health hazard, or any other hazards covered under the HCS. According to Threet, ‘‘the requirement to ‘establish’ the absence of a hazard’’ suggests that OSHA is intending to mandate testing, which the HCS does not require (Document ID 0279, p. 13). 
OSHA disagrees with these 
comments. First, both comments pertain to aspects of paragraph (b)(6)(x) that have been part of the HCS since 1994 and that OSHA’s proposed change does 
not affect. Regardless, contrary to USBSA et al.’s contention, paragraph (b)(6)(x) does not improperly shift the burden of proof onto the chemical manufacturer or importer. As USBSA et al. recognized, courts considering similar language in other OSHA standards have rejected the same argument. They have done so based on the well-established principle that the party seeking to claim an exemption from a legal requirement bears the burden of demonstrating it applies. See Triumph Constr. Corp. v. Sec’y of Labor, 
885 F.3d 95, 98 (2d Cir. 2018); Harry C. 
Crooker & Sons v. OSHRC, 537 F.3d 79, 
86 (1st Cir. 2008). Paragraph (b)(6)(x) is such an exemption (see 59 FR 6154 (stating in promulgation the provision that ‘‘the burden of proof for this exemption belongs to the manufacturer 
or importer’’)). 
Likewise, contrary to Threet’s 
assertion, paragraph (b)(6)(x) does not establish testing requirements or otherwise affect methods of classification under the HCS, as OSHA made clear when promulgating the provision in 1994 (59 FR 6126 (‘‘The hazard evaluation process for nuisance particulates is not any different than for any other chemical.’’)). Therefore, the suggestion to change the words ‘‘do not pose’’ to ‘‘are not classified’’ is unnecessary and OSHA declines to adopt it. OSHA’s addition of ‘‘other hazards’’ to this paragraph is merely clarifying that nuisance particulates also must not pose an HNOC. Because the 
revision will clarify OSHA’s original 
intent and ensure that nuisance particulates posing a combustible dust hazard or an HNOC are properly addressed by the standard, OSHA is finalizing paragraph (b)(6)(x) as proposed. 
OSHA received several additional 
comments that are related to paragraph (b), but that are outside the scope of this rulemaking. An anonymous submitter commented that they support the rule and stated that ‘‘all chemical labels should follow the same guidelines and get approved before being used [in] an 
. . . establishment or put on a shelf’’ 
(Document ID 0296). OSHA interprets this comment as supporting its proposal, but to the extent that the commenter was suggesting that OSHA should apply the HCS to all chemicals in the United States or that it should approve the labels before they are placed on chemicals, these suggestions are outside the scope of this rule because they would involve fundamental changes to the HCS that OSHA has not proposed and in some cases does not have the authority to do. 
NAIMA commented that the HCS 
should apply to all labels within the U.S. Specifically, NAIMA commented that OSHA should not cede labeling authority for products regulated by other agencies and should not allow states to create additional requirements for labelling or classification requirements (Document ID 0338, pp. 11–12). Both of these suggestions are outside the scope of this rulemaking as the agency did not propose anything 
related to these issues. Additionally, OSHA only has jurisdiction to address the occupational hazards posed by chemicals and, even in that sphere, is in some cases preempted from enforcing safety and health standards where other Federal agencies exercise statutory authority (see 29 U.S.C. 653(b)(1)). OSHA cannot mandate how other agencies address labeling issues under 
their jurisdiction, and it already exercises its authority over State Plans in order to ensure that no states create requirements that conflict with the HCS. 
OSHA received several comments on 
pesticide labels and SDSs and consumer product labeling (e.g., Document ID 
0275; 0343, pp. 3–4; 0331, pp. 2–3; 0407, p. 9; 0341; 0340, pp. 3–4). As discussed in the 2012 HCS, OSHA and EPA have worked together to provide guidance to the regulated communities on preparing labels and SDSs for pesticide products (77 FR 17696– 17697). In addition, consumer product labeling is outside of OSHA’s jurisdiction. Since OSHA did not propose to address these issues in the NPRM, these comments are out of scope for this rulemaking and the agency declines to take any of the requested actions. 
(c) Definitions 
Paragraph (c) of the HCS provides 
definitions for terms used throughout 
the rest of the HCS. Paragraph (c) is designed to increase stakeholders’ comprehension of requirements under the HCS and improve compliance with the standard. Many of the definitions in paragraph (c) align with the GHS, but some are unique to the HCS. For definitions that are specifically related to individual health and physical hazards please see Appendices A and B. 
In the NPRM, OSHA proposed 
modifications to three existing definitions in paragraph (c), the addition of definitions for eight new terms, and the deletion of one 
definition. OSHA proposed modifications to: exposure or exposed, hazardous chemical, and physical 
hazard. The eight new terms proposed 
were: bulk shipment, combustible dust, 
gas, immediate outer package, liquid, physician or other licensed health care professional (PLHCP), released for shipment, and solid. OSHA proposed to 
delete the definition of pyrophoric gas. 
For the reasons discussed in the 
remainder of this section, OSHA is finalizing the definitions of bulk 
shipment, exposure or exposed, gas, hazardous chemical, immediate outer package, physician or other licensed health care professional (PLHCP), released for shipment, and solid as 
proposed. In addition, OSHA is eliminating the definition of pyrophoric 
gas as proposed. The agency is 
finalizing the definitions of combustible 
dust, liquid, and physical hazard with 
changes from the NPRM based on comments the agency received. These definitions are discussed below in alphabetical order. 
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Bulk shipment. OSHA proposed 
adding a definition of the term bulk 
shipment to the standard. The proposed 
definition stated that bulk shipment 
means any hazardous chemical transported where the mode of transportation (vehicle) comprises the immediate container ( i.e., contained in 
tanker truck, rail car, or intermodal container). This definition clarifies paragraph (f)(5)(ii), which OSHA proposed in the NPRM to explain that labels for bulk shipments need not be placed on the immediate container but may instead be transmitted with the shipping papers or bills of lading or by other technological or electronic means, as long as the label is immediately available to workers in printed form at the receiving end of the shipment. The proposed definition also distinguishes OSHA’s bulk shipment requirements from the DOT’s Pipeline and Hazardous Materials Safety Administration (PHMSA) requirements for bulk packaging (49 CFR parts 100–185). 
OSHA received multiple comments 
on this proposed definition. The Fragrance Creators Association (FCA) requested clarification as to whether the proposed definition of bulk shipment 
would encompass intermediate bulk containers (IBCs). An IBC is ‘‘a rigid or flexible portable packaging, other than a cylinder or portable tank, which is designed for mechanical handling’’ (49 CFR 171.8), typically holding 110–350 gallons (Document ID 0345, p. 5). According to FCA, these IBCs are commonly placed into inventory as-is, and therefore should be labeled to ensure employee health and safety (Document ID 0345, pp. 5–6). OSHA intends the definition of ‘‘bulk shipment’’ to apply only when the mode of transportation is the immediate container, such as a tanker truck, rail car, or intermodal container. Therefore, IBCs do not fall within OSHA’s definition of a bulk shipment. 
DGAC, Interested Parties for 
Hazardous Materials Transportation (IPHMT), NACD, and NPGA suggested that OSHA should adopt DOT’s definition of ‘‘bulk packaging’’ (Document ID 0339, pp. 1–2; 0423, Tr. 62; 0336, pp. 3–4; 0329, pp. 2–3; 0423, Tr. 124; 0465, pp. 2–3; 0364, pp. 6–7; 0423, Tr. 229). DOT defines ‘‘bulk packaging’’ as: ‘‘a packaging, other than a vessel or a barge, including a transport vehicle or freight container, in which hazardous materials are loaded with no intermediate form of containment. A Large Packaging in which hazardous materials are loaded with an intermediate form of containment, such as one or more articles or inner packagings, is also a bulk packaging. 
Additionally, a bulk packaging has: 
(1) A maximum capacity greater than 
450 L (119 gallons) as a receptacle for a liquid; 
(2) A maximum net mass greater than 
400 kg (882 pounds) and a maximum capacity greater than 450 L (119 gallons) as a receptacle for a solid; or 
(3) A water capacity greater than 454 
kg (1000 pounds) as a receptacle for a gas as defined in § 173.115 of this subchapter.’’ 49 CFR 171.8. 
NACD expressed concern that 
OSHA’s proposed definition of ‘‘bulk shipment’’ would conflict with DOT’s 
definition of ‘‘bulk packaging’’ 
(Document ID 0329, pp. 2–3; 0465, pp. 2–3; 0423, Tr. 124). DGAC stated that the definition of bulk shipment ‘‘should be similar or identical to those contained in the DOT regulations in Section 171 of the Hazardous Materials Regulations . . . [because] many of the packaging described as bulk are used for international movement of hazardous materials, but they’re also used as a containment system in manufacturing. So to have different definitions would create problems’’ (Document ID 0423, Tr. 62). NPGA and IPHMT suggested that OSHA incorporate the DOT definition, on the basis that incorporation would provide clarity on requirements for bulk shipments where both HCS and DOT’s Hazardous Materials Regulations (HMR) requirements apply; would offer uniformity in the training and education of workers on the types of containers and the required information to be displayed for bulk shipments; and would allow for updates to the 
definition of bulk shipment without 
requiring revision to the HCS 
(Document ID 0336, pp. 3–4; 0364, pp. 6–7). They also noted that the definition of bulk shipment needed to be ‘‘clear 
between the agencies’’ in order to codify the joint DOT and OSHA policy from a 2016 guidance document regarding labeling of bulk chemical shipments (Document ID 0244). 
OSHA disagrees with these 
comments. The agency intends for its definition of bulk shipment to differ from DOT’s definition of bulk packaging, as DOT’s definition would not adequately support OSHA’s requirements in HCS paragraph (f)(5)(ii). OSHA’s use of the term bulk shipment 
solely refers to situations where the mode of transportation is also the immediate container, while DOT’s definition for bulk packaging encompasses a broader range of forms of packaging, including those with an intermediate form of containment such as 55-gallon drums or super sacks (flexible intermediate bulk containers) 
which can hold over a ton of material. OSHA only intends to create an exception in (f)(5)(ii) for shipments that do not have intermediate forms of 
packaging. Thus, adopting the DOT definition would not align with OSHA’s 
intent and would provide less information to workers. The guidance created with DOT in 2016 does not conflict with this interpretation and a single definition is not required in order to codify it, as suggested by NPGA and IPHMT. That guidance uses the terms bulk shipment and bulk packaging 
correctly to refer to each agency’s separate definitions and does not use the terms interchangeably. Therefore, OSHA is declining to adopt the suggestion that the agency incorporate or otherwise align with the DOT definition for bulk packaging and is 
finalizing the definition of bulk shipment as proposed. 
Combustible dust. OSHA proposed 
adding a definition of the term combustible dust to the HCS. In the 2012 update to the HCS, OSHA included combustible dust under the definition of hazardous chemical, but did not provide a separate definition of the term. At that time, OSHA did not include a definition of combustible dust 
because the agency was considering a separate combustible dust rulemaking, 
OSHA had already begun work at the GHS on a definition for combustible 
dust, and the UNSCEGHS was also considering combustible dust classification and communication issues (see 77 FR at 17705). Additionally, OSHA explained that it had previously provided considerable guidance on the nature and definition of combustible dust in a variety of materials, including OSHA’s Hazard Communication Guidance for Combustible Dusts (77 FR 17704). Since the 2012 rulemaking, however, OSHA has not promulgated a combustible dust standard and the UNSCEGHS has adopted a definition for combustible dust. 
Rev. 7 defines combustible dust as 
‘‘finely divided solid particles of a substance or mixture that are liable to catch fire or explode on ignition when dispersed in air or other oxidizing media’’ (Document ID 0060). In the NPRM, OSHA preliminarily determined that the definition developed in the GHS was consistent with existing OSHA guidance on combustible dust hazards and proposed adopting this definition (86 FR 9697; Document ID 0190; 0255). In addition, OSHA has other standards that use the term combustible dust but 
do not define the term ( e.g., Grain 
Handling Facilities, 29 CFR 1910.272). 
In the NPRM, OSHA preliminarily 
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determined that the proposed definition 
was consistent with uses of the term in other standards (86 FR 9696). While OSHA still believes the final definition to be consistent with other standards’ use of the term, the agency wishes to clarify its position should inconsistencies arise or become evident. Where the term combustible dust is 
used but not defined in another standard, and where OSHA has guidance specific to that standard, that guidance, rather than the HCS definition, is the relevant interpretive source. 
OSHA received comments from ACC, 
API, and DGAC supporting the proposed addition of a combustible dust 
definition consistent with Rev. 7 (Document ID 0347, pp. 26–27; 0316, p. 2; 0339, p. 1). The agency also received several critical comments. First, several commenters believed that the proposed definition for combustible dust was 
confusing, ambiguous, and too broad (Document ID 0287, pp. 2–4; 0325, pp. 3–4; 0329, p. 3; 0369, Att. 2, pp. 2–3). For example, the Vinyl Institute found the proposed text ‘‘is ambiguous and confusing, is provided without context, appears to be inconsistent with accepted scientific practice and OSHA guidance, and may conflict with the existing HCS classification for flammable solids’’ (Document ID 0369, p. 2). 
Several commenters stated that they 
or their member companies are accustomed to relying on National Fire Protection Association (NFPA) standards to provide a clear and well- defined definition of combustible dust, including testing procedures, and would prefer for OSHA to adopt or align with NFPA’s definition. PLASTICS stated that OSHA has, in the past, referenced NFPA standards that define combustible 
dust as ‘‘[a] finely divided combustible 
particulate solid that presents a flash- fire hazard or explosion hazard when suspended in air or the process-specific oxidizing medium over a range of concentrations.’’ PLASTICS argued that this definition ‘‘clearly state[s] it is necessary to perform testing to determine if a material is a combustible dust and specify the design and energy levels of the igniters to be used’’ (Document ID 0314, p. 15). NACD noted that OSHA’s proposed definition is broader than the NFPA definition and that chemical distributors who import products ‘‘need to be able to provide their foreign suppliers with clear parameters and test methods so they can objectively determine whether or not their material is a combustible dust’’ (Document ID 0329, p. 3). The American 
Forest & Paper Association (AF&PA) and the American Wood Council (AWC) jointly submitted a comment that their members ‘‘have comfortably relied on the well-established, harmonized definition of that term contained in the NFPA combustible dust standards, which specifies the tests to be performed on the material’’ (Document ID 0287, pp. 3–4). AF&PA, AWC and PLASTICS also commented that while the GHS references the ISO/IEC 80079– 
20–2 standard for combustible dust, the 
GHS definition, and therefore also the proposed HCS definition, for combustible dust are inconsistent with 
the current ISO/IEC and NFPA standards (Document ID 0287, pp. 3–4; 0314, pp. 15–16). PLASTICS further commented that the benefits of harmonization with the GHS on the definition of combustible dust would be 
limited since combustible dust is not a classified hazard in the GHS and is only recognized under Canada’s Workplace Hazardous Materials Information System (WHMIS) (Document ID 0314, p. 16). 
Several of these commenters 
requested that OSHA either align its proposed definition with NFPA’s definition or finalize the HCS without adding a definition for combustible 
dust, effectively allowing employers to 
continue using the NFPA definition (Document ID 0314, pp. 15–16; 0369, p. 3; 0287, pp. 3–4). 
OSHA disagrees with commenters’ 
suggestion to adopt the NFPA definition in lieu of the agency’s proposed definition for combustible dust. OSHA 
acknowledges that the wording in the GHS is not precisely the same as the definition in the ISO/IEC testing method consensus standard or the NFPA definition. However, the ISO/IEC method was the starting point for the definition in the GHS and the UN Subcommittee modified it to ensure that it was compatible with other consensus standards and would cover various conditions under which a dust could deflagrate. Similarly, OSHA proposed a broad definition with the intention of providing classifiers with a general understanding of the intrinsic properties 
of the category described. This 
definition, along with others in 
paragraph (c), is not intended to provide 
the detailed descriptions and/or test methods required to classify materials, which are instead provided through guidance materials and consensus standards. This is consistent with other hazards included in the HCS and GHS, for which the HCS and GHS provide a general definition and also provide further criteria or guidance on how to determine if a chemical exhibits this hazard. Additionally, the NFPA definition 
indicates that specific tests would be 
required to determine explosibility. Adopting the NFPA definition in its entirety would be contrary to the general HCS principle that the standard does not require the label and SDS preparer to conduct testing. OSHA is aware that NFPA standards address combustible dust hazards in NFPA 652 as well as other NFPA consensus standards and believes that the agency’s proposed definition of combustible dust 
is compatible with NFPA standards, even though it does not replicate them. Classifiers can therefore continue to rely on the NFPA standards to determine whether a material is a combustible dust. 
Several stakeholders also provided 
comments on specific terms used in OSHA’s proposed definition which differ from the terms used by NFPA. AF&PA and AWC commented that ‘‘catch fire’’ is undefined and could be conflated with ‘‘ignition’’ (Document ID 0287, pp. 3–4). PLASTICS also stated that OSHA’s phrase ‘‘catch fire’’ is unclear, in part because it suggests that ignition energy levels are irrelevant, whereas NFPA standards use and define the term ‘‘flash-fire’’ instead (Document ID 0314, pp. 15–16). The Vinyl Institute commented that ‘‘catch fire’’ could be interpreted as meaning ignition or resulting in a self-sustaining propagation, which could be confused with flammable solid (Document ID 0369, Att. 2, pp. 2–3). USBSA et al. similarly commented that the use of the phrase ‘‘catch fire’’ in OSHA’s definition of combustible dust would 
cause an overlap between the proposed category of combustible dust and the existing category of flammable solids (Category B.7 in Appendix B). As a result of this overlap, a substance might be classified as a combustible dust because of a flammability hazard (rather than because of an explosion hazard) and also classified as a flammable solid for the same reason (Document ID 0325, pp. 3–4; 0425, Tr. 15). USBSA et al. concluded that OSHA should adopt criteria that permit manufacturers to distinguish between the categories of ‘‘combustible dust’’ and ‘‘flammable solids’’ (Document ID 0325, p. 4). 
OSHA agrees with the comments that 
the phrase ‘‘catch fire’’ is insufficiently clear. Accordingly, OSHA has eliminated the phrases ‘‘are liable to catch fire’’ and ‘‘on ignition’’ and replaced ‘‘catch fire’’ with ‘‘pose a flash- fire hazard,’’ similar to NFPA standards 652 and 654 (Document ID 0433; 0457). However, OSHA disagrees that the 
definition will cause confusion between the category of combustible dust and the 
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separate category of flammable solids, 
which have very specific classification criteria and clear test methods for determining flammability. To the extent that there is overlap between the classifications, this is because flammable solids are one type of combustible dust. Even so, it is important to identify both hazards because they can occur under different conditions. For further discussion on flammable solids, please see the Summary and Explanation for Appendix B.7. 
USBSA et al. also commented on the 
word ‘‘explode,’’ stating that it ‘‘is inaccurate and misleading’’ (Document ID 0325, p. 4). USBSA et al. noted that, of the elements needed for an explosion (fuel, ignition source, oxygen, dispersion of dust particles in sufficient quantity and concentration, and confinement of the dust cloud), several were missing from the proposed definition. USBSA et al. stated that without confinement as a criterion, the proper term is ‘‘deflagrate’’ instead of ‘‘explode.’’ USBSA et al. went on to state that OSHA should include the NFPA confinement and particle size criteria of less than 500 microns in the HCS definition of combustible dust (Document ID 0325, pp. 4–6; 0425, Tr. 15–17). 
OSHA agrees that ‘‘explode’’ was not 
sufficiently clear in the proposed definition. In order to provide clarity and consistency with the NFPA definition of combustible dust, as 
commenters requested, OSHA has replaced the term ‘‘explode’’ with ‘‘explosion hazard’’ which refers to when solid particulates are dispersed in air or an oxidizing media. It is the oxidizing media that is especially important for the explosion hazard to be present (Document ID 0433; 0457). Additionally, deflagration is a type of explosion hazard, as indicated by the NFPA definition of explosion hazard, and therefore OSHA believes that it is more appropriate to use the broader term ‘‘explosion hazard’’ here, rather than USBSA et al.’s suggested ‘‘deflagration.’’ Also, to be consistent with the NFPA definition and the term ‘‘explosion hazard’’ OSHA is making a corresponding change of the term ‘‘particle’’ to ‘‘particulate’’ in the HCS 
definition of combustible dust. 
OSHA disagrees, however, with 
USBSA et al.’s suggestion to include criteria for confinement and particle size because these criteria are not appropriate to OSHA’s purpose in providing the definition of combustible 
dust. While OSHA agrees that certain 
conditions must apply before a combustible dust explosion can occur, OSHA does not believe the confinement 
and particle size criteria should be part of the HCS definition, which OSHA has written to include intrinsic properties of combustible dusts but not the conditions required for their ignition. OSHA has taken a similar approach to defining other physical hazards in the HCS. For example, the definition of 
flammable liquids (Appendix B.6) 
includes the flash point, which is an intrinsic property of a material. For a flammable liquid to ignite, several conditions, such as vapor layer and source of ignition, are needed, but these are not properties of the material that render it intrinsically flammable and are therefore excluded from OSHA’s definition. Such conditions are important to evaluating the risk of ignition in handling and use, but not to identifying whether a liquid is itself flammable. Similarly, in the case of combustible dust, confinement is a condition wholly external to the material itself, and the particle size of the material does not determine whether it can ignite (even though it is relevant, together with other factors including the confinement area, to the likelihood of ignition). Therefore, OSHA has chosen not to add confinement and particle size to the HCS definition of combustible 
dust. 
ACC recommended that OSHA place 
‘‘measurable parameters around the definition or specify that it is ideally meant for organic and metal dusts’’ (Document ID 0347, p. 26). OSHA has determined that it is neither necessary to add more specific parameters to the definition of combustible dust nor 
helpful to limit it as ACC proposes. OSHA and NFPA have both provided guidance documents that outline how to determine if a dust is combustible as well as lists of materials that are commonly considered combustible. Moreover, combustible dust hazards are not limited to organic and metal dusts, so to limit the definition as ACC suggests would potentially result in some chemicals that pose combustible dust hazards not being labeled as such. 
Dow commented that the agency 
should make a clear distinction between the definition of combustible dust and 
the phrase ‘‘explosible dust’’ as it is used in Appendix C.4.31 (Document ID 
0359, p. 5). OSHA intends these terms to be interchangeable and uses both terms in its own guidance products. For further discussion on this issue please see the Summary and Explanation for Appendix C.4.31. 
USBSA et al. also asked OSHA to 
clarify that the definition of combustible 
dust is for hazard communication 
purposes only and is not for other regulatory purposes. As OSHA stated 
earlier, the proposed definition is sufficiently broad to be consistent with uses of the term in other standards (86 FR 9696) and would not be the primary source for interpreting those existing standards when the agency has guidance specific to those standards. 
The Edison Electric Institute (EEI) 
asked OSHA to include a statement addressed to its compliance officers in the preamble of this rule acknowledging that a product labeled as posing a combustible dust hazard may not necessarily be combustible in a particular workplace (Document ID 0360, pp. 7–8). As EEI points out, OSHA has repeatedly stated that the determination of a hazard for classification purposes does not necessarily indicate risk in any particular workplace. However, OSHA addresses compliance issues and instructions to its compliance officers in other documents and therefore will not use the preamble of this rule to address this issue. 
For the reasons discussed above, 
OSHA is finalizing the definition of combustible dust as proposed with the following modifications: the phrases ‘‘liable to catch fire’’ and ‘‘ignition’’ are replaced with ‘‘pose a flash-fire hazard’’; the term ‘‘explode’’ is replaced with ‘‘explosion hazard’’; and the term ‘‘particles’’ is changed to ‘‘particulates.’’ The final version defines combustible 
dust as ‘‘finely divided solid 
particulates of a substance or mixture that pose a flash-fire hazard or explosion hazard when dispersed in air or other oxidizing media.’’ While these modifications represent departures from the GHS definition, the agency believes the definition as finalized best effectuates the purpose of the HCS by remaining consistent with the intent of the GHS definition while addressing the Vinyl Institute and others’ concerns, discussed above, that OSHA’s original definition was confusing, ambiguous, and overly broad (Document ID 0287, pp. 2–4; 0325, pp. 3–4; 0329, p. 3; 0369, Att. 2, pp. 2–3). 
Exposure or exposed. OSHA proposed 
revising the definition of exposure or 
exposed. The definition in the 2012 
HCS provided, in relevant part, that exposure or exposed means that an employee is subjected in the course of 
employment to a chemical that is a physical or health hazard. In the NPRM, OSHA proposed revising the definition to mean that an employee is subjected in the course of employment to a ‘‘hazardous chemical,’’ rather than to ‘‘a chemical that is a physical or health hazard,’’ to clarify that the HCS covers the hazards of all hazardous chemicals, 
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including those considered to be 
HNOCs. OSHA received no comments on this proposed revision, and is therefore finalizing the definition of exposure or exposed as proposed. 
Gas, liquid, and solid. OSHA 
proposed to include three new definitions for the terms gas, liquid, and 
solid. The agency proposed including 
these terms to align with Rev. 7 (Document ID 0060). Although not included in the GHS definitions of these terms, OSHA also proposed adding the temperature in equivalent degrees Fahrenheit and pressure in equivalent pounds per square inch (PSI) to the new HCS definitions of gas and liquid 
because those measurements are more commonly used in the U.S. 
OSHA proposed defining gas and 
liquid to be consistent with Rev. 7. 
Furthermore, in accordance with Rev. 7, OSHA proposed including, as part of the definition of liquid, that a viscous 
substance or mixture for which a specific melting point could not be determined ‘‘shall be subjected to ASTM 4359–90 . . . or to the test for determining fluidity (penetrometer test) prescribed in section 2.3.4 of Annex A of the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) . . .’’ Finally, OSHA proposed adopting the GHS definition of solid as a substance or 
mixture not meeting the definitions of liquid or gas. 
The agency proposed to include these 
definitions to improve clarity and ensure consistency in hazard communication and classification both domestically and internationally. The agency believes that defining these terms in the standard will clarify provisions under Appendices B and D for classification of hazardous chemicals and preparation of SDSs. OSHA indicated in the proposal that it did not anticipate that these new definitions would impact other existing standards for construction or general industry. OSHA requested comments on its 
proposal to include these definitions in this update. 
OSHA received multiple comments 
on the specific proposed definitions for gas, liquid and solid. NIOSH supported 
the definitions, indicating that aligning with the GHS definitions would provide transparent, consistent, and clear language that is universally understood and would facilitate hazard communication and inform risk management decisions across multiple scenarios (Document ID 0456, Att. 2, p. 2). API, Michele Sullivan, and DGAC also supported aligning the definitions with the GHS (Document ID 0316, p. 2; 0339, p. 1; 0366, p. 2; 0423, Tr. 62). Ameren supported the new definitions 
and noted that OSHA should consistently implement these and other definitions in the NPRM in all affected OSHA standards (Document ID 0309, p. 15). OSHA discusses the impact of this final rule on other OSHA standards further below. 
Since no commenters objected to the 
proposed definition of gas, OSHA is 
finalizing it as proposed. 
OSHA received two comments that 
were critical of the definition of liquid. 
Specifically, PLASTICS and Toby Threet both commented that the phrase ‘‘shall be subjected to’’ in the proposed definition seemed to indicate OSHA was requiring testing even though the HCS has never required testing to comply with the standard (Document ID 0314, p. 16; 0279, p. 14). 
OSHA agrees with these commenters 
that the proposed language implies a testing requirement and needs clarification. Since it was first promulgated in 1983, the HCS has required that manufacturers, importers, distributors, and employers evaluate the chemical hazards in the workplace and communicate those hazards to workers, but has not required testing in order to meet the provisions of the standard (48 FR 53280, 53290). The HCS specifies in paragraph (d)(2) that there is no requirement to test a chemical for hazard classification purposes. Moreover, the GHS specifically states, in Chapter 1.3.2.4.1, that it ‘‘does not include requirements for testing substances or mixtures’’ (Document ID 0060, p. 19). 
To clarify OSHA’s intention on testing 
for this provision, Threet recommended removing the phrase ‘‘shall be subjected to’’ from the definition and to state 
instead that either of the cited testing methods ‘‘can establish whether a viscous substance or mixture is a liquid if a specific melting point cannot be 
determined’’ (Document ID 0279, p. 14). 
OSHA agrees that these revisions are 
more consistent with the agency’s intent 
and is amending the definition of liquid 
to include these revisions. Additionally, 
OSHA did not provide the PSI conversion for the first time the value 101.3 kPa is used. OSHA is inserting 14.69 PSI with 101.3 kPa in parentheses in the midsection of the definition so that it reads: ‘‘. . . which is not completely gaseous at 68 °F (20 °C) and 
at a standard pressure of 14.69 PSI (101.3 kPa) . . .’’ Accordingly, this final rule defines a liquid as shown in the 
amendatory text of this final rule. 
Finally, OSHA received one 
additional comment on the definition of solid beyond the supportive comments 
noted above. PLASTICS suggested revising the proposed definition to 
recognize plasma as an additional state of matter. PLASTICS noted that plasma is ‘‘a generally accepted state of matter generated in certain lighting and has both cutting and arc welding applications’’ (Document ID 0314, pp. 16–17). 
OSHA does not believe that revising 
the proposed definition of solid would 
serve OSHA’s purpose in adding the term, which was to clarify the HCS and align with the GHS (86 FR 9697). The GHS and the HCS do not define or use the term plasma. The terms in paragraph (c) include those that are relevant to the GHS and the HCS, are needed for comprehension of provisions within the standard, and improve global harmonization (77 FR 17697). Since the term plasma is not defined in the GHS, is not referenced in the GHS definitions of gas, liquid, or solid, and is not related 
to any physical hazard covered under the HCS, the agency declines to revise the proposed definition of solid to 
recognize plasma as a state of matter. OSHA notes that, insofar as the physical properties of the material noted by PLASTICS as ‘‘plasma’’ in lighting, cutting, and arc welding meet the criteria of one of these definitions, they would be covered under the relevant hazard classes. 
For the reasons discussed above, 
OSHA is finalizing the definitions of gas 
and solid as proposed and is revising 
the term liquid to incorporate the 
changes suggested by commenters. 
Hazardous chemical. OSHA proposed 
updating the definition of hazardous 
chemical to delete a reference to 
pyrophoric gas because OSHA proposed 
classifying pyrophoric gas as a physical 
hazard in the flammable gas hazard class (see discussion in the Summary and Explanation for Appendix B.2). OSHA received one comment, from Ameren, stating that the revised definition is acceptable (Document ID 0309, p. 15). No commenter opposed the revision. The agency is therefore 
finalizing the definition of hazardous 
chemical as proposed. 
Immediate outer package. OSHA 
proposed to add a definition for immediate outer package. In this final 
rule, paragraph (f)(12) (discussed in more detail in the Summary and Explanation for paragraph (f)) relaxes labeling requirements for small containers, but still requires complete label information on the immediate outer package. For example, in the case of a kit, the container would be whatever surrounds the chemical itself (e.g., a vial), and the immediate outer 
package would be the first box or package surrounding the container. 
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OSHA received several comments in 
support of the proposed definition. Both 
Ameren and SAAMI supported the definition as proposed and SAAMI commended the agency for providing better harmonization with DOT (Document ID 0309, p. 15; 0294, p. 3; 0412, p. 2). DGAC supported the proposed definition as it provides clarity to the regulation and should enhance compliance with the standard (Document ID 0339, p. 1). No commenter opposed the proposed definition. OSHA is therefore finalizing the definition of immediate outer package as proposed. 
Physical hazard. OSHA proposed to 
update the definition of physical 
hazard. The proposed definition also 
explicitly stated that ‘‘[t]he criteria for determining whether a chemical is classified as a physical hazard are detailed in Appendix B’’. The proposal included two substantive changes to the previous definition: (1) it moved the reference to aerosols out of the parenthetical following the word ‘‘flammable’’; and (2) it added a reference to desensitized explosives. These proposed revisions reflect the new hazard classes proposed for aerosols and desensitized explosives in Appendix B to align with Rev. 7 (see the Summary and Explanation for Appendix B). OSHA received one comment, from Ameren, indicating the revised definition is acceptable (Document ID 0309, p. 15). No commenter opposed the revised definition. Therefore OSHA is finalizing the definition of physical hazard as proposed with two minor technical amendments: OSHA is changing the contents of the parentheticals following ‘‘flammable’’ and ‘‘oxidizers’’ to read ‘‘. . . flammable (gases, liquids, or solids) . . .’’ and ‘‘. . . oxidizers (gases, liquids, or solids) . . .’’ for grammatical consistency with each other. 
Physician or other licensed health 
care professional (PLHCP). OSHA 
proposed adding a definition of physician or other licensed health care professional (PLHCP) to the standard. 
The new definition is necessary in light of OSHA’s proposal to replace the phrase ‘‘physician and nurse’’ in paragraph (i) with the term PLHCP to be 
consistent with other OSHA standards that use the term PLHCP and to better 
reflect current medical practices. That change is also discussed in the Summary and Explanation for paragraph (i). The proposed definition of PLHCP is consistent with the way the 
agency has defined that term in all health standards promulgated since the 
bloodborne pathogen standard, 29 CFR 1910.1030, in 1991. One commenter, Ameren, indicated that the definition is 
appropriate because it is already used in other OSHA standards and reduces confusion with other OSHA standards (Document ID 0309, p. 15). No commenter opposed the proposed definition. OSHA is therefore finalizing the definition of physician or other licensed health care professional (PLHCP) as proposed. 
Pyrophoric gas. OSHA proposed 
deleting the definition for pyrophoric 
gas from paragraph (c) in conjunction 
with its proposals to delete the reference to pyrophoric gas from the HCS definition of hazardous chemical and 
add the definition of pyrophoric gas to 
Appendix B.2, discussed earlier in this section of the Summary and Explanation. OSHA received one comment from Ameren indicating the change was acceptable (Document ID 0309, p. 15). No commenter opposed the change. OSHA is therefore deleting the definition of pyrophoric gas from 
paragraph (c). 
Released for shipment. OSHA 
proposed to add a new definition, released for shipment, to mean ‘‘a chemical that has been packaged and labeled in the manner in which it will be distributed or sold.’’ This is a new term OSHA proposed for use in paragraphs (f)(1) and (f)(11) related to updating labels when new hazard information becomes available. This definition is similar, but not identical to, the definition used by the EPA’s Pesticide Registration and Classification Procedures regulation, 40 CFR 152.3. EPA defines a product as released for 
shipment ‘‘when the producer has 
packaged and labeled it in the manner in which it will be distributed or sold, or has stored it in an area where finished products are ordinarily held for shipment.’’ OSHA did not propose to include chemicals that are stored in an area where finished products are usually held but have not been packaged and labeled in the HCS definition of released for shipment 
because there do not appear to be any feasibility issues with ensuring that such chemicals are labeled with the most updated information. The agency requested comments on whether the proposed definition is appropriate for application to the HCS. In addition, 
OSHA was interested in understanding 
whether the slight differences between 
OSHA’s and EPA’s definitions would 
pose any compliance issues for entities 
dealing with both OSHA and EPA 
labeling requirements. 
OSHA received several comments on 
the proposed definition of released for 
shipment. SOCMA supported the 
proposed definition (Document ID 0447, p. 3). The Vinyl Institute also supported 
the definition, commenting that it reflects the realities of manufacturing operations by recognizing the occurrence of delayed or returned manufactured shipments (Document ID 0369, Att. 2, pp. 8–9). 
A few other commenters were 
concerned that the proposed definition would cause confusion. Tom Murphy commented that workers may misunderstand the intention of the proposed definition; for example, the proposed language could be interpreted by workers as meaning products that had passed quality control testing, were correctly packaged for shipment, were ‘‘approved for presentation to the customers,’’ and were ready to move into inventory (Document ID 0277, p. 2). Murphy suggested that ‘‘packaged for shipment’’ may be a better term and would reduce misinterpretation by workers (Document ID 0277, p. 2). ACC similarly commented that released for 
shipment might be misunderstood to 
mean that the package ‘‘has met the business need or logistics criteria’’ and is ready for shipment, and suggested that OSHA adopt ‘‘packaged for shipment’’ or ‘‘labeled for shipment’’ instead (Document ID 0347, p. 9). 
NACD recommended that OSHA 
reconsider including this definition, which they commented could create confusion and uncertainty as to whether the label must state ‘‘released for shipment.’’ Similar to other commenters, NACD noted that many products may be packaged and labeled but are still awaiting a final quality control check, third-party testing, or customer approval (Document ID 0329, p. 3; 0465, p. 3). 
OSHA has decided not to adopt these 
suggestions for several reasons. First, the suggested changes would misalign the agency and EPA’s terms. Specifically, under EPA’s regulation, released for shipment is defined as product or stock that is packaged and labeled in a manner in which it will be 
distributed or sold, and the producer or distributor must provide the pesticide label to the receiver before or at the time of distribution (40 CFR part 152.3). Many of the regulated entities who are affected by OSHA’s proposal to add a definition of released for shipment are 
also required to comply with EPA’s regulations, and OSHA does not want to cause confusion for parties who must comply with both, so OSHA finds that the proposed changes are not necessary and would be contrary to OSHA’s purpose for including this definition. 
Moreover, OSHA disagrees that the 
definition will result in confusion. In response to NACD’s comments, OSHA 
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does not intend for the manufacturer, 
importer, or distributor to include the phrase ‘‘released for shipment’’ on the label. The definition is only provided in paragraph (c) to help classifiers and other stakeholders understand the meaning of paragraph (f)(11). Furthermore, as is discussed in the Summary and Explanation for paragraphs (f)(1) and (f)(11), OSHA is eliminating the proposed requirement for the released for shipment date to be included on the label. Therefore, it is unnecessary for manufacturers to use the date of manufacture as a stand in for that term, as suggested by NACD. OSHA believes this clarification that the phrase ‘‘released for shipment’’ is not intended to be printed on the label (or anywhere on the package) may also relieve commenters’ concerns that the phrase 
‘‘released for shipment’’ will be 
confused with readiness for shipment in a business or logistical sense by 
individuals working in facilities where 
packages are stored for shipment. 
Toby Threet commented that the 
‘‘date of labeling and the date of release for shipment are the same thing, under OSHA’s definition’’ (Document ID 0279, p. 15). Since the agency is eliminating the proposed requirement to include the released for shipment date on the label, no such confusion should arise from the definition that OSHA proposed for released for shipment. 
After considering the comments and 
testimony submitted, OSHA has determined that the definition for released for shipment should be 
retained in the final rule and should use the term ‘‘released’’ in order to align with EPA’s definition of released for 
shipment in its Pesticide Registration 
and Classification Procedures regulation, 40 CFR 152.3. Therefore, OSHA is finalizing the definition of released for shipment as proposed. 
OSHA also received a few comments 
not related to any specific proposed definition. API commented that in general ‘‘any definitions used should align with the GHS’’ (Document ID 0316, p. 2). API stated that if a GHS definition is not available then the term should not be used. Alternatively, they suggested that if OSHA uses a term that is not taken directly from the GHS, then OSHA should ‘‘be transparent that the definition has not yet been harmonized 
in GHS and could change once harmonized’’ (Document ID 0316, p. 2). OSHA disagrees that only terms from the GHS should be used in the HCS. The OSHA HCS regulatory framework existed well before the GHS. While OSHA has aligned with the hazard classes of the GHS and most provisions in the annexes of the GHS that apply to occupational situations, the HCS includes additional provisions to inform and protect workers while providing a consistent framework for businesses regulated under the HCS. In addition, OSHA has been clear in both the NPRM and this final rule about the extent to which each definition aligns with the GHS. 
OSHA also received a comment from 
PRINTING United Alliance (PRINTING) 
requesting the addition of a definition 
for ‘‘injurious corrosive material’’ (Document ID 0357, pp. 4–5). This is a term that appears in OSHA’s Medical Services and First Aid standard at 29 CFR 1910.151(c), not in the HCS. PRINTING expressed difficulty ascertaining which chemicals are ‘‘injurious corrosive materials’’ that require provision of eye wash or flushing stations pursuant to 29 CFR 1910.151(c) and asked OSHA to add a definition to the HCS similar to that used by Michigan Occupational Safety & Health Administration (MIOSHA) in a guidance document related to eyewash facilities (Document ID 0357, pp. 4–5). However, the HCS is not an appropriate location for a definition of ‘‘injurious corrosive material’’ because that term is not used in the HCS. Therefore, the agency will not be including this definition in the update to the HCS. 
OSHA also received a comment from 
IMA–NA stating that OSHA should ‘‘align any definition of nanomaterials in the HCS to the EPA’s definition’’ (Document ID 0363, pp. 5–6). While OSHA has addressed particle characteristics, including particle size, in the context of Section 9 of the SDS in Appendix D (see Summary and Explanation for Appendix D), the agency has not proposed to add a definition of nanomaterials to the HCS and finds this comment to be outside the scope of this rulemaking. 
Finally, as indicated above, OSHA 
received one general comment on the potential impact of several of the new or revised definitions on other standards. While Ameren commented that the definitions are generally acceptable, 
they also commented that they believed 
these new and revised definitions 
would impact other OSHA standards, 
contrary to OSHA’s assertion, and that OSHA needed to ensure that for several of the new and revised definitions they were consistently implemented in other OSHA standards. Specifically, they cited potential impacts on 29 CFR 1910.120, Hazardous waste operations and emergency response, and 29 CFR 1926.1101, Asbestos. However, Ameren did not provide any specifics as to how these two standards might be impacted. Many of the terms that OSHA is 
adding or updating in this final rule are 
not used in the standards referenced by Ameren. Of the terms Ameren cited, only gas and liquid are used in 29 CFR 
1910.120 and 29 CFR 1926.1101. In both standards, the terms are used in a very different way in contexts that make clear what is meant by the term gas or 
liquid. For instance, the term gas is used 
to modify the word meter (1910.120 (c)(6)(ii)) and used in reference to gas leakage in chemical protective suits (1910.120 (g)(4)(iii)). OSHA is not convinced that there will be any confusion on what is meant by the terms gas or liquid in these cases. 
As stated above in the discussion 
under the combustible dust definition, 
while OSHA indicated in the proposal that it did not anticipate that these new definitions would conflict with or otherwise impact other existing standards for construction or general industry, the agency notes that where the same term is used but not defined in another standard, and where OSHA has guidance specific to that standard, that guidance, rather than the HCS definition, is the relevant interpretive source. 
(d) Hazard Classification 
Paragraph (d)(1) of the HCS outlines 
the requirements for chemical 
manufacturers and importers to evaluate the hazards of chemicals that are in the workplace or being imported to determine the hazard classes, and where appropriate, the category of each class that apply to the chemical being classified. 
In the NPRM, OSHA proposed two 
changes to paragraph (d)(1). OSHA proposed to revise the second sentence of paragraph (d)(1) to read that for each chemical, the chemical manufacturer or importer shall determine the hazard classes, and where appropriate, the category of each class that apply to the 
chemical being classified under normal 
conditions of use and foreseeable emergencies (emphasis added to 
indicate the proposed new language). The intent of the language that OSHA proposed was to simply reiterate the scope language currently in paragraph (b)(2) and OSHA’s longstanding position that hazard classification must cover hazards associated with normal conditions of use and foreseeable emergencies. As OSHA explained in its compliance directive for the HCS (Document ID 0007), for example, known intermediates, by-products, and decomposition products that are produced during normal conditions of use or in foreseeable emergencies must be addressed in the hazard 
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56Throughout this section and in the regulatory 
text, OSHA refers to the ‘‘intrinsic’’ properties of 
chemicals. OSHA considers this to be synonymous with ‘‘inherent’’ properties, a term used by some commenters and in the original HCS. classification. OSHA also proposed to 
add a new sentence to paragraph (d)(1) stating that the hazard classification shall include any hazards associated with a change in the chemical’s physical form or resulting from a reaction with other chemicals under normal conditions of use. 
OSHA believed adding this language 
to be necessary because there had been some confusion about whether chemical reactions that occur during normal conditions of use must be considered during classification and whether this information should be placed on the label and/or the SDS. This issue has arisen, for instance, when multiple chemicals are sold together with the intention that they be mixed together before use. For example, epoxy syringes contain two individual chemicals in separate sides of the syringe that are mixed under normal conditions of use. The intent of this proposed new language was to ensure that manufacturers and importers understood what information should be on the label (hazards associated with the chemical as shipped, including changes in physical form) versus what belonged on the SDS (all hazard information including information on hazards created through downstream use), and OSHA accordingly proposed a change in paragraph (f)(1) as well to reflect the new language in (d)(1). In addition, the proposed new language better aligns with international trading partners’ label requirements under REACH and WHMIS and provides consistency on where this information is located so workers can easily find the information. 
OSHA received several comments 
agreeing on the need for clarification about the requirements related to classification of hazards resulting from downstream uses. NABTU agreed that OSHA’s clarification on the hazards covered under (d)(1) would help workers find information more quickly and minimize mistakes, as well as aid in training, because it would improve consistency in the location of information (Document ID 0425, Tr. 37). Additionally, NABTU provided several examples where hazards created by chemical reactions as part of the intended use of the product were not being conveyed consistently and, in some cases, not at all (see, e.g., 
Document ID 0450, Att. 2, p. 5). NABTU provided safety data sheets for spray foams, epoxies, and cement where a chemical reaction occurs in downstream workplaces following the manufacturer’s instructions. The information on the SDSs for these 
chemicals does not differentiate the hazards of the original chemical versus the hazards the worker might be exposed to through prescribed use of the product (see, e.g., Document ID 0450, 
Att. 2, p. 5). Additionally, California’s Department of Industrial Relations, Division of Occupational Safety and Health (Cal/OSHA) provided the example of a hair smoothing product used in professional hair salons where the intended use of the product created 
different hazards due to chemical 
reactions (formation of formaldehyde during use which caused various adverse health effects) than the hazards associated with the original chemical. In this case, these hazards were not identified on either the label or the SDS (Document ID 0451, pp. 3–4). Without this information, downstream users are unaware of the potential exposures and therefore do not have the information necessary to adequately protect themselves. NIOSH also supported the change and said that it would be helpful for worker safety and health (Document ID 0281, Att.1, p. 6). 
However, OSHA also received 
numerous comments indicating that OSHA’s proposed language could be misunderstood and cause confusion on what would be required under paragraph (d)(1). Many of these commenters opposed inclusion of the proposed language as written. Based on the comments received, as explained further below, OSHA is modifying the proposed language to more clearly articulate OSHA’s intent for the scope of this requirement as well as to better distinguish between hazards associated with the chemical as shipped and hazards associated with downstream use. Specifically, OSHA is deleting the phrase ‘‘under normal conditions of use and foreseeable emergencies.’’ The agency is adding at the end of (d)(1) the phrase ‘‘The hazard classification shall include any hazards associated with the chemical’s intrinsic properties including:’’ and then adding two subparagraphs, (d)(1)(i) and (d)(1)(ii).
56 
New paragraph (d)(1)(i) reads, ‘‘a change in the chemical’s physical form and;’’ and new paragraph (d)(1)(ii) reads, ‘‘chemical reaction products associated with known or reasonably anticipated uses or applications.’’ OSHA is also changing the language in paragraph (f)(1) to clarify that hazards identified and classified under new paragraph (d)(1)(ii) will not be required to appear on a product’s label (see the Summary 
and Explanation for paragraph (f)(1)). Changes in Appendix D clarify that 
hazards identified and classified under both paragraphs (d)(1)(i) and (d)(1)(ii) must be included in Section 2 of the product’s SDS. As stated above, OSHA considers the language, as finalized, to be a rephrasing of the language proposed in the NPRM to more clearly articulate OSHA’s intent and not a substantive change from what OSHA originally intended in the NPRM or the preexisting requirement to incorporate downstream uses. The rest of the section therefore still relies on previous guidance and statements OSHA made regarding ‘‘normal conditions of use and foreseeable emergencies’’ to support the language OSHA is finalizing in this rule. 
In the following discussion, OSHA 
addresses the comments received on paragraph (d)(1), separated by theme. 
I. Arguments That the HCS Has 
Historically Not Required Manufacturers To Classify Chemicals Due to Hazards Related to Downstream Use 
Several stakeholders commented that 
the HCS historically has not required manufacturers to classify hazards based on downstream reactions (Document ID 0318, pp. 3–4; 0325, pp. 7–15; 0326, p. 3; 0337, p. 2; 0314, pp. 4–5; 0348, p. 2; 0356, p. 7; 0369, p. 4). For example, ACC stated, ‘‘[n]ot only is OSHA’s approach incompatible with the current language of the HCS, it is not supported in the text or regulatory history of the HCS’’ (Document ID 0347, p. 3). ACC quoted OSHA’s preamble from the 2012 update, where OSHA stated that manufacturers and importers have greater knowledge and expertise with regards to the composition of the chemicals they make or import than do downstream employers and are usually in the best position to assess the intrinsic hazards associated with them, whereas downstream employers are usually in the best position to determine the risk arising from the use of the chemical in their workplaces (Document ID 0347, p. 3). ACC also quoted OSHA’s compliance directive, where OSHA acknowledges that downstream users who alter the product become the manufacturer and become the 
responsible party, so would need to consider all the known or intended uses of the products when classifying for hazards. ACC commented that OSHA has not identified any guidance documents that would support the agency’s interpretation of (d)(1) (Document ID 0347, pp. 2–3). Additionally, PLASTICS indicated that OSHA has not historically required manufacturers to classify the hazards of by-products produced during 
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downstream use of a chemical. 
PLASTICS provided several examples dating back to 2004 indicating that OSHA did not intend to have the byproducts included in the hazard determination process or that the downstream employer was responsible for the hazard determination process for byproducts. PLASTICS also indicated that OSHA has been unclear and that various guidance documents have appeared to be inconsistent in their discussion of the scope of the hazard classification process (Document ID 0314, Att. 1, pp. 4–9). 
NAIMA suggested that OSHA should 
address the hazard classification revision in a separate rulemaking, and request information from the regulated community. NAIMA viewed the proposed changes as OSHA’s attempt to impose new burdens and regulatory changes in the guise of harmonizing the HCS with the GHS (Document ID 0338, p. 9). 
OSHA disagrees that the HCS has not 
historically required manufacturers to identify hazards related to downstream uses of the chemical they produce or provided any guidance to this effect. While ACC is correct that OSHA, in the preamble to the 2012 HCS, distinguished between the relative knowledge of manufacturers and downstream employers, ACC neglected to include in their comment the paragraph immediately following the one it quoted. That paragraph states: ‘‘OSHA’s approach in promulgating the HCS reflects this reality. It places the duty to ascertain and disclose chemical hazards on manufacturers and importers, so that downstream users can use this information to avoid harmful exposures to chemical hazards. But because manufacturers and importers will often have less information about the particular exposures of downstream users, their hazard assessment and communication obligations are imposed only for all normal conditions of use of their chemicals and foreseeable emergencies associated with those 
chemicals’’ (emphasis added) (77 FR 17601–02). Additionally, during the 2012 rulemaking, in paragraph (a)(1) OSHA changed the language to specify that the purpose of the HCS is to ensure classification of hazards, rather than merely assessment or evaluation of them, further indicating that the language in the scope section regarding normal conditions of use and foreseeable emergencies was intended to apply to the classification process, not just assessment of hazards more broadly (77 FR 17693). Thus, the 2012 HCS did, 
in fact, contemplate that manufacturers would classify their chemicals for hazards associated with these types of 
downstream uses. 
This concept has been part of the HCS 
since the beginning. As indicated in the preamble to the 1983 HCS, stakeholders raised concerns then regarding responsibility for providing information on MSDSs (now referred to as SDSs) that only the downstream employer could know. In response, OSHA agreed that ‘‘[t]he chemical manufacturer or 
importer, in making hazard 
determinations, should evaluate and communicate information concerning all the potential hazards associated with a chemical, whereas the employer may supplement this information by instructing employees on the specific nature and degree of hazard they are likely to encounter in their particular exposure situations’’ (48 FR 53296). The preamble of the 1983 HCS went on to explicitly state ‘‘[t]herefore, the chemical manufacturer must provide thorough hazard information, which would be applicable to a full range of reasonably foreseeable exposure situations, rather than limiting the information on the basis of presumed use. The downstream employer will then be assured of having the information reasonably necessary to make informed choices for control measures’’ (48 FR 53307). When OSHA updated the HCS in 2012, it replaced the hazard determination process with the hazard classification process and indicated that hazard classification was ‘‘very similar to the process of hazard determination that is currently in the HCS, with the exception of determining the degree of hazard where appropriate’’ (58 FR 17698). 
Another example of OSHA’s 
longstanding view that manufacturers must consider downstream hazards is found in a 1994 LOI regarding normal conditions of use for wood products. The LOI stated that wood and wood products are exempt from the hazard communication standard as articles ‘‘if the only hazard presented from use of the product is flammability or combustibility, which are hazards that are well-known among users of wood products. However, it may not be generally known among users that inhalation of certain types of wood dust or chemicals used to treat wood can present a serious lung disease hazard. For this reason, OSHA has always 
required under the hazard 
communication standard that 
distributors of wood products provide 
MSDS to employers whose employees 
may be exposed to these inhalation 
hazards’’ (available at https://
www.osha.gov/laws-regs/standard
interpretations/1994-12-05). As in 1994, OSHA does not intend that every possible downstream use be accounted for, only those that are known or can be reasonably anticipated. This policy was reiterated in a 2016 LOI which stated that manufacturers ‘‘must make a reasonable effort to obtain reliable information to determine how their product(s) or by-product(s) may expose workers under normal conditions of use or in foreseeable emergencies. A manufacturer’s or importer’s hazard classification must anticipate the full range of downstream uses of its products and account for any hazardous by-products that are known to be present and may be formed’’ (available at https://www.osha.gov/laws-regs/
standardinterpretations/2016-05-20 ). 
The LOI went on to state that manufacturers are not required to contact every downstream workplace to obtain this information, but a reasonable effort should be made. 
Finally, contrary to ACC’s and 
PLASTICS’ assertions, OSHA guidance documents have included in the hazard determination step that ‘‘[a]ll possible physical or health hazards that might be associated with a chemical’s use must be considered,’’ including in OSHA’s 2007 Guidance For Hazard Determination (available at https://
www.osha.gov/hazcom/ghd053107). This concept was carried forward into the 2015 HCS compliance directive which also indicates that manufacturers must consider downstream uses of their chemicals when classifying. For example, the directive, which provides in-depth guidance on how to apply the criteria for classification, explains that a HNOC means an adverse physical or health effect that is not covered under one of the existing hazard classes in the standard. The directive then explains that: ‘‘The term physical effect generally refers to a material impairment of health or functional capacity caused by the intrinsic hazard(s) of a particular chemical in normal conditions of use or foreseeable emergencies’’ (Document ID 0007, pp. 19–20). These statements in combination make clear that OSHA expected the hazards of downstream uses to be accounted for in the classification process. Additionally, what PLASTICS identified as inconsistency in OSHA’s guidance actually represents its misinterpretation of the level of knowledge that can be expected from a manufacturer, importer, or distributor in two different scenarios: one where the chemical in question is used downstream to manufacture other chemicals and the other where the chemical is used by end-users. However, the confusion that PLASTICS 
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points to is exactly why OSHA has 
decided to clarify in this final rule the scope of this existing obligation. 
Additionally, OSHA has enforced the 
HCS in accordance with this understanding of the obligations to label for downstream hazards, which further reinforces the longstanding nature of this requirement. For instance, in 2011 and 2012 OSHA cited a number of manufacturers under the HCS for failing to communicate the hazards of formaldehyde exposure to salons, stylists, and consumers using hair products containing that chemical (see https://www.osha.gov/hair-salons/ government-response). 
As indicated above, OSHA has 
determined that the language it originally proposed to add to paragraph (d)(1), which would have stated that hazard classification shall include any hazards associated with a change in the chemical’s physical form or resulting from a reaction with other chemicals under normal conditions of use, is insufficiently precise, and is therefore adopting revised language in this final rule. The final language provides that hazard classification ‘‘shall include any hazards associated with the chemical’s intrinsic properties including: (i) a change in the chemical’s physical form and; (ii) chemical reaction products associated with known or reasonably anticipated uses or applications.’’ This language in the final rule ties a responsible party’s classification obligations to what the manufacturer, importer, or distributor knows or can reasonably anticipate and avoids the concerns that several commenters raised that the language was too vague (see, e.g., Document ID 0368, pp. 3–4; 0402, 
p. 1; 0283, p. 13; 0461, pp. 2–3; 0315, pp. 3–4; 0313, p. 3). Stakeholders should be familiar with the term ‘‘reasonably anticipated’’ because OSHA has used similar language in multiple standards, guidance products, and LOIs, including the bloodborne pathogens standard (29 CFR 1910.1030), the respirable crystalline silica standard (29 CFR 1910.1053), and the hazardous waste operations and emergency response standard (29 CFR 1910.120). Moreover, this term is commonly used by other agencies as well; for example, the National Toxicology Program (NTP) uses ‘‘reasonably anticipated’’ as a classification for carcinogens (reasonably anticipated to be a human carcinogen) (86 FR 72988). EPA’s TSCA regulations (40 CFR 723.250) also use the term ‘‘reasonably anticipated’’ in their scoping language: ‘‘Reasonably anticipated means that a knowledgeable 
person would expect a given physical or chemical composition or characteristic to occur based on such factors as the 
nature of the precursors used to manufacture the polymer, the type of reaction, the type of manufacturing process, the products produced in polymerization, the intended uses of the substance, or associated use conditions (40 CFR 723.250).’’ 
II. Arguments That Classification 
Should Be Based on Inherent or Intrinsic Hazards 
OSHA received multiple comments 
from a variety of stakeholders stating 
that hazard classification is based on the 
intrinsic or inherent properties of the chemical and the proposed changes in paragraph (d)(1) go beyond the meaning of intrinsic or inherent properties (Document ID 0303, p. 1; 0347, pp. 2– 3; 0322, p. 14; 0424, Tr. 116, 117, 138, 195, 205; 0366, p. 3; 0323, pp. 2–5; 0214, pp. 1–15). 
OSHA agrees that the intention of the 
hazard communication standard is to provide information based on the intrinsic or inherent hazards of the chemical that are presented in the workplace and that are not tied to the level of exposure to the chemical, but disagrees that the change in paragraph (d)(1), either as proposed or as finalized here, goes beyond the meaning of intrinsic or inherent hazards. In final paragraph (d)(1), OSHA has made explicit that hazard classification under the HCS should be based on the intrinsic properties of the chemical to which workers are exposed. As finalized, paragraph (d)(1) also identifies two examples of intrinsic properties: changes in the chemical’s physical form and chemical reaction products associated with known or reasonably anticipated uses or applications. Label and SDS preparers must consider both when classifying the 
chemicals they produce, import, or 
distribute. These examples are 
consistent with OSHA’s longstanding 
interpretation of intrinsic properties or hazards. 
To clarify the meaning of intrinsic 
hazards, OSHA provided several examples in guidance issued in 2015 and 2016 regarding what the agency would consider non-intrinsic hazards (Document ID 0007, p. 20; 0008, p. 385). For instance, the agency explained that hazards due to scalds caused by exposure to chemicals at high temperatures and slips and falls caused by treading on a solid chemical shaped in a rounded form or spilled liquids are not physical effects caused by the chemical’s intrinsic properties under the HCS. Any substance that is heated to high temperatures can cause a scald, and any spilled liquids could be a slip hazard. Intrinsic hazards are hazards 
that are derived from the essential nature or character of the substance, reaction product, or mixture, which would not simply be true of any substance under those conditions. Even prior to adopting the GHS in 2012, OSHA had identified intrinsic hazards as the basis for identification and hazard determination for the information on the labels, SDSs, and worker training. OSHA is not deviating from this approach. How a chemical will behave when its physical form changes and what chemical reaction products form when it is used downstream are based on the properties that are intrinsic to that chemical and would not be true of simply any substance under those circumstances, and thus fall within OSHA’s conception of what constitutes an intrinsic hazard. 
Michele Sullivan suggested that the 
agency should instead take a two- pronged approach to address the issue of inherent hazards and require (1) classification of chemicals as shipped, with hazard class and category and (2) inclusion of hazards or warnings, rather than classification, for chemical products with directions for downstream use, such as kits (Document ID 0366, p. 3). OSHA does not agree with this approach because it incorrectly applies the idea of intrinsic hazards as a more limited concept, and the agency believes that the language ‘‘known or reasonably anticipated uses or applications’’ cabins the breadth of the language in (d)(1)(ii) so that it is feasible for manufacturers, importers, and distributors to classify in accordance with the requirements. 
As noted above, to address these 
concerns, OSHA is updating the regulatory text to include the term ‘‘intrinsic’’ in (d)(1) to clarify that the 
hazard information required is based on classification of hazards related to the intrinsic properties of the chemicals workers are exposed to. The agency believes that this clarifies OSHA’s intent that the hazard be of an intrinsic nature and that it considers hazards from both changes in the chemical’s physical form and chemical reaction products associated with downstream use to be related to intrinsic properties. 
III. Arguments That the Proposed 
Revision to (d)(1) Would Shift the Burden From Downstream Users to the Originating Manufacturer (or Upstream) 
Several commenters expressed 
concern that OSHA’s proposed changes to paragraph (d)(1) would improperly shift the responsibility for determining and classifying chemical hazards from downstream users, such as 
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manufacturers and employers that 
process chemicals, to the original manufacturer of the chemical (Document ID 0314, p. 2; 0323, p. 3; 0326, pp. 4–5; 0337, p. 2; 0347, p. 2; 0423, Tr. 134; 0348, pp. 1–2; 0404, pp. 3–4; 0361, p. 1; 0362, pp. 2–3; 0329, p. 8; 0287, p. 6). For example, ACMA noted that ‘‘. . . unlike the PSM standard where the responsibility for the analysis is properly placed on the employer operating the covered process, OSHA’s proposal would shift that obligation upstream to each of the multiple chemical manufacturers or importers who supplied a reactant in the downstream chemical reaction’’ (Document ID 0318, p. 9). The Vinyl Institute noted that ‘‘[a] broad expansion of the scope of the hazard classification of the upstream supplier to reflect the hazards of downstream chemical reactions and the products of those reactions (including ‘‘foreseeable emergencies’’) would be inappropriate. It would shift the responsibility from where it belongs (on the downstream manufacturer) to an upstream supplier who generally has not specified the chemicals to be used in the downstream reaction, has not designed the process chemistry, has not designed the process equipment in which the reaction occurs, has no control over the operation of the process and has no idea what other chemicals in the facility might be involved in what might be a foreseeable emergency from the perspective of the downstream manufacturer-employer’’ (Document ID 0369, p. 5). NACD stated that determining downstream hazards is outside the scope of responsibilities for a distributor or producer under the standard and that it is downstream employers who, under the HCS, bear the responsibility to conduct hazard assessments that apply to their own workplaces. NACD also commented that any chemical that can be mixed with a wide range of other chemicals could have an exponentially long and unknown list of hazards that ‘‘result from a chemical reaction’’ and that such hazards cannot reasonably be documented by an upstream user (Document ID 0465, p. 4). The Council of Chemical Association Executives (CCAE) provided similar comments (Document ID 0469, p. 2). Dow stated that the concept of classifying reaction products is overly broad and expands OSHA’s existing requirement for manufacturers to assess chemical hazards of the product as manufactured and shipped (Document ID 0359, p. 2). 
OSHA disagrees that the proposed 
new language in paragraph (d)(1) shifts any burden from the downstream user to the manufacturer. First, as explained 
above, the revisions to paragraph (d)(1) clarify the existing requirements for hazard classification and do not create new requirements. Regardless, the intent of the new language is not to require manufacturers, distributors, or importers to predict how downstream employees will be exposed to a chemical or to anticipate every conceivable way the chemical could be used, but rather to classify the chemical 
for hazards that arise through known or reasonably anticipated uses, thereby 
providing downstream users with sufficient information to perform a hazard assessment specific to their own workplace and how employees use the chemical there. As described above, OSHA has revised the language in this final rule to better reflect this intent. OSHA agrees that downstream users still must assess whether the specific processes they use will cause hazards in the workplace and is only adding this language to clarify that if the upstream manufacturer, distributor, or importer is aware of hazardous chemical reactions with the known or reasonably anticipated uses of its product it must include hazard classifications for those hazards. 
IV. Arguments That the Proposed 
Change to (d)(1) Would Be Infeasible or Overly Burdensome to Manufacturers as It Would Require Knowledge of All the Downstream Uses To Classify Correctly 
Many comments indicated that it 
would be infeasible or extremely burdensome for manufacturers, distributers, and importers of chemicals to learn all downstream uses of products and correctly classify them accordingly (Document ID 0291, pp. 5–6; 0303, p. 2; 0314, p. 10; 0315, p. 3; 0316, pp. 3–4; 0317, pp. 2–3; 0318, pp. 4–5; 0319, pp. 1–2; 0323, p. 3; 0324, p. 2; 0327, p. 7; 0347, Att. 1, pp. 2–4; 0468, pp. 1, 3; 0348, p. 2; 0356, pp. 7–9; 0357, pp. 1– 3; 0359, p. 2; 0363, pp. 3–4; 0366, p. 3; 0367, p. 4; 0329, p. 2; 0369, p. 6). For example, Worksafe stated that ‘‘[b]oth ‘normal conditions of use’ and ‘foreseeable emergencies’ are largely unknowable by producers’’ (Document 
ID 0354, p. 4). HCPA also stated that it is not practical to list every potential 
hazard of the cleaning product which 
could interact with any number of 
unknown soils when used by 
downstream consumers (Document ID 0327, pp. 7–8; 0424, Tr. 15–17). 
NAIMA asserted that under the 
proposed new language, the upstream 
chemical manufacturer or supplier 
would be responsible for performing a 
chemical process hazard analysis and hazard classification for each downstream chemical reaction and the 
reaction products of that downstream chemical reaction conducted by a downstream customer or manufacturer. NAIMA stated that downstream reactions typically involve at least two chemicals, and often mixtures, that would require multiple manufacturers’ suppliers to provide redundant and overlapping chemical process hazard analysis and hazard classification to all of these downstream manufacturers. They also noted this same requirement would also apply upstream to the suppliers’ suppliers, and ‘‘the real world problem with such astounding overreach is it is unlikely that any manufacturers will take the risk of such a convoluted and impossible evaluation’’ (Document ID 0338, p. 10). 
Dow also stated that proposed 
changes implied that the manufacturer and SDS preparer are responsible for knowing all foreseeable downstream uses of the substance, including chemical reactions and resulting chemicals generated, that could occur in the downstream supply chain with that substance. Dow suggested that to require this level of knowledge would present a significant compliance challenge for chemical manufacturers because manufacturers cannot reasonably know all possible resulting chemical reactions and uses by downstream users and the hazards they may create. Dow further explained that the hazards created by manufacturing and the resulting chemical reactions are the responsibility of the manufacturer performing that manufacturing, as they are the experts in the product and the chemistry they are performing (Document ID 0359, pp. 1–2). 
NACD commented that its members 
do business in different markets, which makes it difficult for them to ascertain every type of downstream use that could be considered normal conditions of use. NACD stated that it is impractical for a manufacturer or distributor to know all possible uses, hazards, or potential reactions associated with downstream customers, and manufacturers should be only responsible for communicating the hazards present in the form of the chemical as sold (Document ID 0329, p. 8; 0423, Tr. 128–130; 0465, p. 4). 
Innovative Chemical Technologies 
(ICT) stated that a chemical producer 
cannot adequately guess all possibilities and then analyze those scenarios for hazards to include on the SDS because a reaction results in one or more new chemical substances, which may be more or less hazardous than the reactants. ICT expressed concern that compliance with the proposed revision would require chemical producers to 
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essentially do a portion of a process 
hazard analysis (PHA) for reaction products, focused on customer sites that it does not own or control (Document ID 0324, p. 2). ACMA and PLASTICS submitted similar comments (Document ID 0314, Att. 1, p. 12; 0318, p. 8). OSHA notes that ACMA also asserted in their comment that the proposed language in paragraph (d)(1) is economically infeasible but did not provide financial data to corroborate the assertion. As explained in Section VI.G., Economic Feasibility and Impacts, OSHA has determined based on the record evidence that the requirements of this final rule are economically feasible. 
After reviewing the concerns 
expressed in the numerous comment submissions on this provision, OSHA concludes that the agency’s intention was not clear as written and was therefore misinterpreted. OSHA did not intend for an upstream supplier or manufacturer to identify every conceivable use or process in which a downstream user might apply the chemical and to classify these potential hazards of chemicals downstream. OSHA’s intent was to ensure classification only for those downstream uses where the manufacturer knows or could reasonably anticipate how the chemical will be used and where that use creates a hazard that needs to be communicated in the workplace. The record demonstrates that manufacturers have basic information on how their chemicals will be used by downstream users and markets to those uses. For instance, many chemical manufacturers have product stewardship programs to address these very issues (Document ID 0443, p.1; 0330, p.1). However, the agency is also aware that product research and new uses will continue to be developed and that some chemicals have so many uses it would be difficult to anticipate them all. Therefore, the agency finds it would be unreasonable to expect manufacturers to predict and account for every possible use downstream. For example chemicals, such as toluene, that are often used as starting materials for manufacturing other chemicals, would likely have too many possible uses for the upstream chemical manufacturer to know or reasonably anticipate the ways that it could be combined with other chemicals. OSHA would not expect manufacturers of toluene, for instance, to classify hazards of the products that use toluene as a starting material in the manufacture of a downstream user’s products. However, manufacturers of toluene would still need to ensure that the SDS had the appropriate information in Section 10 on stability 
and reactivity that would help those downstream manufacturers consider the risks of their specific processes. 
Therefore, as explained above, OSHA 
has modified the language to better reflect the agency’s intent that hazard classification should encompass hazards present during downstream uses or applications that are known or reasonably anticipated by the manufacturer, importer, or distributor, such as the intended use for which the 
substance is manufactured. 
Moreover, OSHA received comments 
describing situations where not only 
would it be feasible for manufacturers to include hazard information regarding known or reasonably anticipated uses or applications, it would also greatly improve worker safety. Cal/OSHA provided several examples of uses of materials that manufacturers should have been aware of but did not include on the SDS (Document ID 0322, pp. 13– 14; 0375, pp. 13–14). One such use was an aerosol degreaser used in automotive repair facilities that was linked to cases of neuropathy in automotive repair technicians. Cal/OSHA stated that it was standard practice in the industry for the technicians who were assigned the dirtiest jobs in an automotive repair facility to use between six and 10 cans of degreasing solvent products in just one day (Document ID 0322, pp. 13–14; 0375, pp. 13–14). The agency finds that this example shows the utility of the new language in paragraph (d)(1) because not only does it illustrate the intrinsic hazard presented by the product, but demonstrates that this type of use would be ‘‘reasonably anticipated’’ to a manufacturer familiar with the automotive repair industry, given Cal/OSHA’s findings that this was 
a pervasive practice in that industry. 
Cal/OSHA also provided an example 
of workers in hair salons being exposed to excessive amounts of formaldehyde 
formed as a reaction product to hair 
straightening products used in the 
salons (Document ID 0451, Att. 1, pp. 3– 4). Cal/OSHA had submitted this as an example of their concerns that the proposed language ‘‘normal conditions of use’’ would ‘‘open the door for producers—without sufficient downstream information—to not disclose a chemical based on the 
assumption that under ‘normal conditions of use,’ no health-hazardous exposures would occur,’’ concerns which Worksafe echoed in their comments (Document ID 0451, p. 2; 0354, p. 1). However, OSHA finds just the opposite, particularly with respect to the revised language that the agency is adopting in this final rule. Since the conditions described by Cal/OSHA are 
apparently commonplace in the salon industry, the formaldehyde hazard would result from a ‘‘known or reasonably anticipated use’’ for a manufacturer or distributor familiar with that industry and would therefore be encompassed by paragraph (d)(1). OSHA believes that clarifying hazard classification requirements under paragraph (d)(1) will ensure that manufacturers, distributors, and employers understand how to meet their obligation to disclose this information to workers and that workers will be better protected. 
Additionally, OSHA received 
examples of product stewardship programs and SDSs that demonstrate companies are aware of and able to determine the uses of their products, which further underscores the feasibility and utility of requiring them to identify known or reasonably anticipated uses. NIOSH also indicated that both individual manufacturers and coalitions have product stewardship programs, which allow sharing of information related to product uses, and cited ACC’s ‘‘Responsible Care’’ program as an example. NIOSH described these programs as a ‘‘great tool’’ for hazard communication (Document ID 0423, Tr. 39; 0456, Att. 2, p. 2). ACC, in its post hearing comments, also discussed at length the various ways that some of their members engaged with downstream users to ensure safety information was thoroughly provided, including on-site training, customer notification letters, surveys and questionnaires, and indicating additional information on the SDS regarding typical reactions (Document ID 0468, p. 5). NABTU also provided examples of SDSs and product stewardship programs that account for downstream uses of chemicals (Document ID 0450, Att. 7). 
In conclusion, OSHA agrees with 
commenters that it would not be possible for every manufacturer, importer, and distributor to be aware of every single use or application of its products, and the agency is not requiring these entities to do the kind of intensive investigations that many of the commenters described as infeasible. Additionally, regulated parties will not immediately be aware of all uses when new products are developed or when there are trade secret issues with downstream users. Similarly, OSHA would not expect a manufacturer to know every use of feedstocks (raw materials used to make other chemical products), starting materials or 
commodity chemicals, solvents, reactants, or chemical intermediates 
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where there could be thousands of uses 
or the substances are used in downstream manufacturing to produce new chemical products. However, the agency concludes that manufacturers must make a good faith effort to provide downstream users with sufficient information about hazards associated with known or reasonably anticipated uses of the chemical in question. As discussed above, OSHA is finalizing language to make this clear, and to tie the classification obligation to either the manufacturer, importer, or distributor’s own knowledge or facts that the manufacturer or importer can reasonably be expected to know. 
V. Arguments That It Would Be 
Impossible To Correctly Classify Uses Due to Downstream Manufacturers’ Trade Secret/CBI Issues 
Several commenters suggested that 
full classification might not be possible in situations where downstream users may not share usage information due to confidential business information (CBI) or trade secret concerns (see, e.g., 
Document ID 0291, pp. 5–6; 0324, p. 2; 0326, p. 4; 0337, pp. 2–3; 0348, p. 4; 0363, p. 4; 0367, p. 4; 0369, p. 5; 0347, p. 2; 0468, p. 3). OSHA would not consider a manufacturer or supplier to know or be able to reasonably anticipate a downstream use if the downstream user uses the chemical in a proprietary process, producing derivatives that are trade secrets. Therefore, this situation would not trigger the classification requirements under paragraph (d)(1). 
VI. Arguments That This Would Lead to 
Duplicative Classification 
ICBA and others expressed concern 
about how OSHA’s proposed new language in paragraph (d)(1) would apply to chemicals like carbon black, 
which are typically sold in bulk quantities for use in a multitude of different downstream products. ICBA noted that because those downstream products also contain various other substances, all of the upstream manufacturers of the ingredient substances would have to ‘‘independently and duplicatively classify[ ] downstream products,’’ which would be inefficient and could lead to ‘‘divergent hazard classifications of the same product’’ (Document ID 0291, p. 6; 0318, p. 2–9; 0348, pp. 1–4; 0461, pp. 1–2). ICBA stated that ‘‘the downstream user is in the best position to classify its own product.’’ Similarly, NAIMA stated that ‘‘It is unclear how manufacturer- suppliers and manufacturer-users would resolve a situation in which multiple suppliers of reactants used in a particular downstream chemical reaction are required to perform a 
hazard classification for that reaction and reach different conclusions, which seems likely for any chemical with broad uses’’ (Document ID 0338, p. 3). 
OSHA agrees that manufacturers of 
chemicals are responsible for the classification of their own chemical products. As discussed above, OSHA’s intent in adding clarifying language to paragraph (d)(1) was not to require upstream manufacturers to engage in hazard analyses with respect to products created downstream, but rather to ensure that upstream manufacturers provide sufficient hazard information about their own products so that downstream users have the information they need to conduct their own hazard analyses and/or take other appropriate action. This will not result in duplicative or divergent classification because the manufacturers, importers, and distributors will not be required to do hazard classification unless they know or could reasonably anticipate the uses with sufficient information to classify the hazard. ICBA and NAIMA’s concerns about duplicative classification rest on the assumption that the responsible party will be required to learn the processes of every downstream user and perform hazard classification for each process, but as OSHA has clarified above, that is not the case. Additionally, this change would not decrease the quality of information provided to workers. On the contrary, as indicated in the 1983 HCS, when manufacturers provide thorough hazard information, applicable to a full range of reasonably foreseeable uses, downstream manufacturers and employers will have the information necessary to make informed choices for control measures without limiting the downstream manufacturer from providing additional information as warranted (48 FR 53307). 
VII. Arguments That the Information Is 
Already Covered Under Other Specific Sections of the SDS 
The clarifying changes OSHA is 
making to paragraph (d)(1) also clarify the requirements of Section 2 of the SDS because that section requires the 
presentation of hazard information for chemicals. Accordingly, several commenters provided comments 
relevant to paragraph (d)(1) as it relates 
to the SDS. Several stakeholders 
commented that the information OSHA proposed to clarify is required in section 2 of the SDS is already covered in other 
sections of the SDS (Document ID 0303, 
p. 2; 0347, p. 2; 0468, Att. 2, p. 12; 0361, 
p. 1; 0329, pp. 7–8; 0356, p. 6; 0467, p. 
4). Tom Murphy commented that there are limits to the concept of 
‘‘foreseeable’’ in the context of an emergency and that the information is better covered under paragraph (h) Employee information and training and 
placed under section 10(c) of the SDS (Document ID 0277, p. 3). The American Welding Society (AWS) commented that ‘‘current requirements are adequate to ensure that manufacturers continue to warn about the general nature of the anticipated physical and health hazards arising out of product use, as appropriate, in Sections 2, 8, 10 and 11 of the product Safety Data Sheet’’ (Document ID 0303, p. 2), while ACC commented that ‘‘the requirement is unnecessary as these hazards are already identified in sections 5, 9, and 10 of the SDS. Anything beyond that is unrealistic and entirely speculative’’ (Document ID 0467, Att. 2, p. 14). ILMA commented that this information should be in section 11 and section 15 (Document ID 0356, p. 6). The Archer- Daniels-Midland Company (ADM) and PLASTICS stated that this information should be in other sections without further explanation (Document ID 0361, p. 1; 0467, p. 11). 
As OSHA discussed in the 2012 
update to the HCS, the standardization of the SDS format improves the effectiveness of the SDS by providing a format that makes it easier for users to find information (77 FR 17596). Additionally, the information commonly wanted and used by employees, and of the greatest interest for emergency responders is presented early in the SDS while more complex or technical information is presented later (58 FR 17596). While it is true that similar, but not identical, information may be contained in multiple sections of the SDS and used for different purposes and potentially by different readers of the SDS, the changes to paragraph (d)(1) specifically require Section 2 to contain information on hazards resulting from a change in the chemical’s physical form and from chemical reaction products when they are known or can be reasonably anticipated. Although there does exist some overlap between Section 2 and Section 10, Section 2 provides workers with necessary, easily understandable health and safety information, whereas Section 10 provides health and safety professionals information on when and how to design safety systems to protect workers. Similarly, Section 5 of the SDS provides information on fire-fighting measures which are specific to types of hazards related to fire; Section 8 provides information on exposure controls and personal protection but 
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does not indicate the actual hazards 
associated with the chemicals; Section 11 provides information on stability and reactivity of a chemical which is used primarily by medical professionals, occupational health and safety professionals, and toxicologists (Document ID 0060, p. 394); and Section 15, which is a non-mandatory section, permits additional information on regulatory requirements. Therefore, Section 2 is the appropriate location for information about actual hazards and the specific hazard classifications that workers can easily access. For more detailed discussion on the various sections of the SDS, please see the Summary and Explanation for Appendix D. 
VIII. Arguments That the Proposed 
Paragraph (d)(1) Does Not Align With the GHS or International Trading Partners 
Several stakeholders commented that 
the language proposed in the NPRM does not align with international trading partners, or the GHS (Document ID 0314, pp. 12–13; 0326, p. 3; 0338, p. 2; 0348, p. 3; 0362, p. 1; 0369, pp. 5–7; 0366, p. 1; 0347, pp. 4–5; 0468, Att. 2, p. 12). AWS stated that the GHS uses the term ‘‘hazard classification’’ to indicate only intrinsic properties of substances (or mixtures). AWS said these hazardous properties are based on the hazards exhibited in the form substances (or mixtures) are purchased, shipped, and received in commerce, not from subsequent use in the workplace. AWS urged OSHA to ‘‘not deviate from the principles of classification based upon intrinsic hazards and be consistent with the reasoned approach taken by the authors of the GHS’’ (Document ID 0303, p. 2). Hach made the same point (Document ID 0323, pp. 4–5). Similarly, NACD commented that since the proposed requirements in the SDS are not included in the GHS, the proposal would make OSHA’s requirements more divergent from the global system rather than aligning with it (Document 0465, p. 5). ACC stated that ‘‘the requirement is not part of the GHS, so rather than facilitating alignment, the change would have the opposite effect of making the U.S. rules even more divergent from the global system’’ (Document ID 0468, Att. 2, p. 12). The Vinyl Institute commented that the language proposed in the 2021 NPRM was in contrast to language in the EU CLP citing Article 5: ‘‘The information shall relate to the forms or physical states in which the substance is placed on the market and in which it can reasonably be expected to be used’’ (Document ID 0369, pp. 6–7). Contrary to commenters’ arguments, 
the GHS does not specify that it only 
applies to chemicals in their shipped form or in commerce; it states that it applies to all hazardous chemicals across stages in their life cycles (Document ID 0060, p. 5). As explained above, OSHA believes commenters have conflated the idea of intrinsic or inherent hazards with hazards of a chemical as shipped. Additionally, OSHA opined on the development and implementation of the GHS in the 2012 
rulemaking to update the HCS. As 
discussed there, in developing the GHS, it was recognized that countries’ regulatory authorities would need to have the discretion to address national circumstances in ways that are suited to the regulatory perspective of the country. Thus, authorities such as OSHA are free to make determinations about scope and application issues while still being harmonized with the primary provisions of the GHS (58 FR 17695). Therefore, OSHA disagrees with the commenters’ premise that any difference between the HCS and the GHS means that OSHA is improperly deviating from the GHS or from its trading partners. 
In any event, OSHA interprets the EU 
CLP differently than the Vinyl Institute and finds the changes to paragraph (d)(1) actually align with similar provisions in other jurisdictions since the CLP guidance quoted by the Vinyl Institute explicitly requires consideration of ‘‘reasonably expected use’’ during the classification process (Document ID 0256, p. 55). 
Additionally, since a number of other 
countries separately regulate hazards of chemicals as shipped and chemicals in the workplace, OSHA is improving alignment of labels with other countries that may only regulate hazards of 
chemicals as shipped by clearly stating that hazards related to downstream use only need to be on the SDS. Therefore, the agency believes that the inclusion of this language actually strengthens 
trading relations because it better aligns 
the HCS with international 
jurisdictional requirements for labeling 
and workplace hazard communication. 
IX. Arguments That Proposed Paragraph 
(d)(1) Will Result in Expansion of Tort Liability for Manufacturers 
Several commenters stated that the 
proposed changes to paragraph (d) would expand tort liability for manufacturers (Document ID 0314, p. 12; 0326, p. 4; 0366, p. 3; 0369, p. 4). Hach commented that ‘‘expanded legal obligation to perform hazard classifications at the downstream levels creates more opportunities for inadequate hazard communication,’’ 
which could cause plaintiffs’ attorneys to pursue claims against upstream manufacturers (Document ID 0323, p. 5). NACD and CCAE stated that because of liability concerns with attempting to determine all downstream uses and chemical reactivity hazards, the proposed change will result in several pages of ‘‘legalese’’ to indemnify the entity on the SDS, which will not enhance worker safety. Consequently, they stated, manufacturers and distributors should be responsible for communicating the hazards of the material in the form sold only (Document ID 0329, p. 8; 0423, Tr. 128– 130; 0465, pp. 4–5; 0469, p. 3). 
However, no commenter provided 
specific examples of case law or other evidence to support their contentions that the proposed language to update paragraph (d) would result in an expansion of tort liability. Moreover, the OSH Act expressly provides that nothing in the statute shall supersede, or in any manner affect, workers’ compensation laws or other common law or statutory rights, duties, or liabilities related to employment-related injuries, illnesses, or fatalities (29 U.S.C. 653(b)(4)). Therefore, OSHA finds no merit to arguments that adoption of the proposed changes to paragraph (d) would expand tort liability. 
X. Arguments That the Proposed 
Paragraph (d)(1) Will Result in Software Issues 
Both ACC and NACD commented that 
computer systems used by most larger companies to generate SDSs are automated using existing formulations based on current rules and companies would incur a significant burden to update the systems (Document ID 0347, Att. 1, p. 8; 0329, p. 5). NACD reasoned that, because many chemical manufacturers and distributors rely on 
the services of outside software companies to prepare SDSs, adopting the proposed changes in the SDS would create complications for manufacturers and distributors. NACD indicated that this change would require product-by- product evaluation of hazards, ‘‘which is contrary to the basic principles of the GHS’’ and which would cause problems because much of the software used by manufacturers relies on GHS classifications and data from the EU (Document ID 0465, p. 5). 
OSHA is not convinced that the 
changes to paragraph (d)(1) will lead to significant burdens for industry. First, as to NACD’s assertion that there are no data sources for downstream reactions, SDS preparers can use the same sources as they do for classification of other 
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chemicals as well as information from 
the manufacturer. Additionally, if it were true that software companies could not respond to updates to the GHS and changes in classification procedures, then neither OSHA nor other countries would ever be able to make regulatory changes to maintain alignment with the GHS (see Section VI., Final Economic Analysis and Regulatory Flexibility Analysis). In fact, NACD did not contend that there are technological barriers to creating compliant software, only that existing software is not currently configured to meet these requirements. Finally, because the new language simply clarifies that classifiers must include hazards associated with known or reasonably anticipated uses, these hazards are most likely already classified elsewhere, such as the 
example discussed above where 
formaldehyde was generated as a by- product during use of hair straightening 
products (Document ID 0451, pp. 2–8). 
Accordingly, OSHA finds that software- related concerns do not pose an obstacle to adopting the new language in paragraph (d)(1). 
XI. Arguments That the Inclusion of the 
Proposed Language Could Be Misinterpreted as Including ‘‘Articles’’ 
Some commenters believed that 
inclusion of the originally proposed language, ‘‘normal conditions of use’’ and/or ‘‘foreseeable emergencies,’’ could be misinterpreted as including ‘‘articles,’’ which are generally exempted from the HCS (Document ID 0339, p. 2; 0332, pp. 1–2, 4; 0358, p. 2; 0369, pp. 3–4). The Portable Rechargeable Battery Association (PRBA) suggested that the proposed language demonstrated ‘‘OSHA’s intention to expand the purview of the HCS to include certain products that have previously been exempted as articles’’ (Document ID 0332, p. 4). The Vinyl Institute commented that ‘‘it would be inappropriate to consider changes in physical form through destruction or recycling to be a normal condition of use that would change the classification of a product as an article. Under such an unprecedented approach, OSHA would disqualify almost every current article from continuing to be treated as an article’’ (Document ID 0369, pp. 3–4). The Vinyl Institute indicated this concern was prompted by OSHA’s classification requirement with respect to downstream changes in physical form under normal 
conditions of use such as: ‘‘(a) Reduction in particle size from combustible solids to combustible dust, (b) Reduction in particle size from non- respirable to respirable, (c) solid substances becoming corrosive or 
irritant when moistened or in contact with moist skin or mucous membranes’’ (Document ID 0369, pp. 3–4). Similarly, AF&PA and AWC’s joint comment stated that destruction and demolition of wood products could be considered ‘‘normal conditions of use’’ (Document ID 0287, pp. 5–6). 
OSHA did not and does not intend 
the change in paragraph (d)(1) to affect the definition of ‘‘article’’ or change the exemption status of any product. The HCS defines ‘‘article’’ as ‘‘a manufactured item . . . which is formed to a specific shape or design during manufacture . . . which under normal conditions of use does not release more than very small quantities . . . of a hazardous chemical . . . and does not pose a physical hazard or health risk to employees’’ (29 CFR 1910.1200(c)). Nothing in paragraph (d)(1) affects this definition. Moreover, to the extent the commenters were concerned about the originally proposed language ‘‘normal conditions of use and foreseeable emergencies,’’ that language, as explained above, has been revised and does not appear in the final rule. 
XII. Arguments That Proposed 
Paragraph (d)(1) Will Result in Over- Warning or Warning Fatigue for Downstream Chemical Users 
Several commenters suggested that 
the proposed changes in paragraph (d)(1) would lead to confusion and complexity of the SDS that could lead to ‘‘over-warning’’ or ‘‘warning fatigue’’ as workers could be receiving multiple warnings on the same chemical, or irrelevant hazard information potentially turning the SDS into a ‘‘novel.’’ They argued this could lead to workers being overloaded or overwhelmed with hazard information that may be too confusing to discern the real hazards they would be potentially 
exposed to (Document ID 0314, p. 10; 0318, p. 6; 0319, p. 2; 0337, p. 2; 0343, pp. 2–3; 0356, p. 8; 0369, p. 6; 0468, Att. 2, p. 12; 0348, p. 4; 0444, p. 3; 0361, p. 1; 0362, p. 7; 0329, p. 8). Many of these comments are related to chemicals that are produced in bulk quantities and intended to be ingredients in various downstream chemical products. For example, NACD indicated that ‘‘[a]ny chemical that can be mixed with a wide range of other chemicals could have an exponentially long and unknown list of hazards that ‘result from a chemical reaction’ ’’ (Document ID 0329, p. 8). 
OSHA disagrees that the changes to 
paragraph (d)(1) create any problem with warning fatigue. First, as explained above, manufacturers need not classify hazards for every conceivable future use, just those that are known or 
reasonably anticipated. Second, the SDS and the product label serve two different purposes. As provided for in paragraph (f)(1) of this final rule, hazards associated with known or reasonably anticipated uses do not need to be included on a product’s label. Such hazards must be included in Section 2 of the SDS, but this is appropriate because the SDS is meant to have more comprehensive information available to workers who need or desire more details about the product. OSHA is not dictating how this information is presented in Section 2 of the SDS. SDS preparers have discretion to present the information in an organized fashion to prevent confusion for the downstream user. 
XIII. Additional Comments 
OSHA received additional comments 
that did not fit neatly within any of the 
above categories. ACC stated its belief ‘‘that OSHA has conflated two separate obligations under the Hazard Communication Standard—the scope of the HCS with respect to an employer’s workplace, and the scope of the hazard classification (known as the ‘hazard determination’ prior to HCS 2012’’ (Document ID 0468, p. 2). ILMA and PLASTICS made similar comments (Document ID 0314, pp. 2–3; 0356, p. 6). OSHA believes that these concerns arose from the agency’s proposed use in paragraph (d)(1) of the terms ‘‘normal conditions of use’’ and ‘‘foreseeable emergency,’’ which both appear in paragraph (b)(2) of the HCS, which describes the scope of the entire standard. Because the use of those terms in paragraph (d)(1) created significant misinterpretations, OSHA has changed the regulatory language for this final rule, as explained above. 
Several commenters also argued that 
the examples OSHA provided were 
insufficient to support the broad nature of the proposed language in paragraph (d)(1) (Document ID 0325, pp. 8–13; 0323, p. 4; 0316, pp. 3–5, 0362, pp. 2– 3). For example, Hach claimed that the examples OSHA provided were unique situations and did not warrant the ‘‘proposed over broadening of the classification scope’’ (Document ID 0323, p. 4). 
OSHA disagrees with commenters 
who suggest that there is insufficient evidence presented to support the requirement. While OSHA provided several examples in the NPRM, other commenters, such as Cal/OSHA and NABTU (as discussed above), have also provided additional examples of situations where manufacturers should have reasonably anticipated 
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downstream hazards but failed to warn 
of these hazards and workers were harmed. 
SAAMI was concerned that the 
proposed language in paragraph (d)(1) would impose additional requirements on explosives since these types of materials can be used for demolition or destruction as a normal condition of use and that the classification as an explosive and the resulting hazard communication is sufficient to alert users to the potentialities (Document ID 0412, p. 3). OSHA believes that the classification of explosives already accounts for many of the hazards that would be associated with demolition or destruction because the hazard is still explosiveness regardless of whether that risk is in transport or during actual use of the explosives. However, the HCS covers all health and physical hazards and there are some circumstances of downstream use that need to be accounted for during the classification process, such as if the explosive itself creates a toxic atmosphere when used. 
The National Association of Printing 
Ink Manufacturers (NAPIM) suggested that OSHA should define the term ‘‘reaction’’ for paragraph (d)(1) because some members of the regulated community may not understand what OSHA intends it to mean in this context (Document ID 0317, p. 2). OSHA does not believe this is necessary. First, the term ‘‘reaction’’ is used in multiple ways throughout the HCS depending on the context of the requirement. For example, in Appendix A it is used to describe health effects (e.g., Table A.4.2) 
while in Appendix B the term ‘‘chemical reaction’’ is part of the definition for explosives (see B.1.1.1). Thus, OSHA believes that providing a single definition of ‘‘reaction’’ for the whole standard could create confusion. OSHA also does not believe the term ‘‘chemical reaction’’ needs a definition because it is common knowledge for SDS preparers that ‘‘chemical reaction’’ refers to a change of the chemical structure versus a mere change in the physical form of a substance. Several commenters indicated that the proposed language would only be reasonable if it were limited to uses specified or directed by the upstream supplier and that OSHA should ensure that paragraph (d)(1) only applies to a narrow range of downstream reactions (see, e.g., Document ID 0316, p. 4; 0362, 
p. 3; 0404, p. 3; 0367, p. 5; 0315, p. 3, 0359, p. 1–2). For example, HCPA agreed that ‘‘the chemical reactions should be included in the hazard assessment in cases when multiple 
chemicals are sold together with the intention that they’d be mixed together before use.’’ However, HCPA stated that 
the proposed changes in paragraph (d)(1) constitute agency overreach, giving the example of concentrated cleaning products that downstream customers dilute with water and the inability of the manufacturer to know every type of a soil a cleaning product might be used on (Document ID 0327, pp. 7–9; 0424, Tr. 15–17). They 
recommended that the mixing of two or 
more chemicals be considered in classification only when the label directs the user to use the chemical in such a manner and excludes products where the label directs users to only mix with water (Document ID 0327, p. 7). Similarly, Dow suggested that the proposed paragraph be revised to state that the manufacturer need only provide product chemical reaction hazard assessment based on its intent and the knowledge of a chemical reaction that will occur during the downstream use of its product as manufactured and sold (Document ID 0359, pp. 1–2). 
OSHA disagrees with these comments 
for several reasons. First, OSHA would not expect any additional hazard classifications simply for diluting a more concentrated chemical with water because, as HCPA noted, such an action would only reduce the chemical’s hazards, not increase them. Second, under the finalized language in paragraph (d)(1), manufacturers of cleaning products need only classify hazards associated with known or reasonably anticipated uses of the products, not every potential type of soil that a downstream customer might clean. OSHA believes that ‘‘known and reasonably anticipated uses’’, rather than only uses that are explicitly directed by the product’s label, is the appropriate requirement to provide sufficient information to downstream employers and workers. 
Two commenters suggested that 
OSHA should rescind the proposed text and address unique situations of hazard identification and downstream uses affecting the scope of HCS in a letter of interpretation rather than updating the standard (Document ID 0323, p. 5; 0368, p. 3). OSHA disagrees. The regulatory text is the first and primary place the regulated community turns to understand its obligations under the HCS. The agency is exercising its statutory authority to promulgate and revise safety and health standards through notice-and-comment rulemaking. OSHA has provided an opportunity for stakeholders to comment on the proposed regulatory text changes, reviewed and considered 
all of the comments, and made changes to the regulatory text, where appropriate, based on the record as 
whole. By making this change in the regulatory text, OSHA intends to ensure all regulated parties are aware of this requirement and alleviate confusion on this point. Addressing this issue in letters of interpretation would not achieve the full extent of that goal. 
XIV. Suggested Edits/Proposed New 
Language 
OSHA also received several 
recommendations for changing the proposed text for paragraph (d)(1), in addition to those discussed above. PLASTICS and Vinyl Institute recommended that OSHA state detailed and narrow conditions under which classification of downstream reactions would be required. Their recommendations for such conditions included where the manufacturer specifies the uses, provides all of the chemicals, and specifies the complete process and process conditions. Additionally, they recommended adding that the classification is only contingent on the downstream users following the specified processes (Document ID 0314, pp. 14–15; 0369, pp. 7–8). A joint comment from RISE and CropLife also provided recommendations for new text that would limit the classification requirement to only ‘‘approved’’ uses (Document ID 0343, p. 3). RISE and CropLife explained that their proposed revision ‘‘narrows the scope of the hazard classification and provides clarity so the provision can be more readily implemented without over classification of the chemical hazards’’ (Document ID 0343, p. 3). 
ACC submitted proposed new text for 
paragraph (d)(1): ‘‘In the case of a hazardous product for which instructions for use, provided at the time of the sale or importation, require its combination with one or more products, mixtures, materials or substances resulting in the creation of one or more new materials or substances that present one or more new or more severe hazards not already identified on the safety data sheet of the hazardous product, the safety data sheet must also provide the following information 
elements, in respect of each new material or substance and clearly indicate that they pertain to that new material or substance: (a) the nature of the new or more severe hazard; and (b) the content of the applicable specific information elements set out in Appendix D to § 1910.1200—SAFETY DATA SHEETS (Sections 4–11)’’ (Document ID 0347, Att. 1, p. 8). ACC stated that while their preference was for OSHA to remove the proposed 
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language entirely, if the agency was 
unwilling to remove the language, then OSHA should consider utilizing their draft text as it was modeled after a similar Canadian provision (Document ID 0347, Att. 1, p. 9). 
OSHA appreciates these stakeholders 
providing thoughtful proposals for new language, but the agency finds that the suggested changes do not represent the original intent which OSHA’s proposal sought to clarify. The commenters’ suggested changes would narrow the current obligations of the HCS (thereby reducing protections for workers) and, in some cases, would introduce new ambiguity. PLASTICS’ and Vinyl Institute’s suggested edits, while appearing to give clarity to what they perceived OSHA’s intent to be, contain qualifications that would actually narrow the scope of the HCS and the classification requirements. Similarly, in the language suggested by RISE and CropLife, requiring classification only for uses specified on the label would not only narrow the scope of the HCS but might incentivize manufacturers to minimize the information provided to downstream users to limit the need for classification. OSHA also does not believe that ACC’s language is less ambiguous. It would require the manufacturer to decide if or when a hazard is more severe than a hazard already identified or whether it is identified on the SDS. This also defeats the purpose of having the hazards in one section upfront on the SDS to ensure that the workers are aware of all of the potential hazards without having to read the entire SDS. Accordingly, OSHA declines to adopt the suggestions. 
XV. Out of Scope Comments 
OSHA received two comments on 
paragraph (d) that are out of scope for 
this rulemaking. First, Cal/HESIS recommended that OSHA add a new paragraph (d)(4) which would provide a source for authoritative lists for chemical classifications (Document ID 0313, p. 4). This comment is out of scope for this rulemaking, as OSHA did not propose a change related to this issue. In addition, OSHA notes that this is already addressed in the non- 
mandatory Appendix F of the HCS. Second, Cal/OSHA, Worksafe, and the National Council for Occupational Safety and Health (National COSH) commented that OSHA should include in paragraph (d)(2) the ‘‘single study rule’’ (Document ID 0322, p. 2; 0354, p. 1; 0407, p. 12). This comment, too, is out of scope because OSHA did not propose a change related to this issue. OSHA notes that the extent of its incorporation of the single positive study is explained in the preamble to 
the 2012 HCS (77 FR 17708) and is discussed further in the Summary and Explanation for Appendix A.0.3.5 of this final rule. 
To summarize, for the reasons 
discussed above, OSHA is finalizing different language than what was proposed in the NPRM to better clarify the extent of the obligations of manufacturers, importers, and 
distributors and to better distinguish the 
requirements for hazard classifications that must appear on the label and those that appear only in the SDS. OSHA is not finalizing the proposed phrase ‘‘under normal conditions of use and foreseeable emergencies,’’ but is adding language providing that hazard classification shall include hazards associated with the chemical’s intrinsic properties, including ‘‘(i) Ca change in the chemical’s physical form and; (ii) chemical reaction products associated with known or reasonably anticipated uses or applications.’’ As discussed above, OSHA believes that stakeholders should be familiar with the terms ‘‘known’’ and ‘‘reasonably anticipated’’ as OSHA has used these terms in multiple standards, guidance products, and LOIs. The agency finds that this language captures the intent of the original language from 1983 and the intent of the proposal while minimizing ambiguity. Finally, this clarification will ensure that workers have the information necessary to protect themselves from the hazards posed by chemicals to which they are occupationally exposed. 
(e) Written Hazard Communication 
Program 
Paragraph (e) of the HCS provides 
specific requirements for chemical manufacturers, importers, distributors, or employers to develop, implement, and maintain a written hazard 
communication program. Paragraph (e)(4) requires employers to make their written hazard communication program available, upon request, to employees, their designated representatives, the Assistant Secretary and the Director of NIOSH. 
The final rule contains one change to 
correct a reference in paragraph (e)(4) that erroneously referred to 29 CFR 1910.20 instead of 29 CFR 1910.1020 when specifying when and how 
employers must make the written 
hazard communication program 
available. OSHA’s Access to Employee 
Exposure and Medical Records standard 
was originally located at § 1910.20, but 
was renumbered to § 1910.1020 in 1996 
(61 FR 31429), resulting in the incorrect 
reference OSHA is now correcting. In the NPRM, OSHA proposed this minor 
editorial correction after finding that an inadvertent misprint occurred in the print version of the CFR. Specifically, in the print version of the CFR, paragraph (e)(4) references § 1910.20 instead of § 1910.1020 (OSHA’s Access to Employee Exposure and Medical Records standard). OSHA proposed to fix this error. At the time the NPRM was published, the error was reflected only in the print version of the CFR and the eCFR (www.ecfr.gov) was correct, but at 
the time of this final rule, the eCFR is also incorrect. 
No stakeholders objected to the 
correction of the reference. However, OSHA received one comment suggesting that a different standard should be referenced to explain when and how employers must make written hazard communication programs available. The U.S. Department of Defense, Force Safety and Occupational Health (DOD) asserted that § 1910.1020 ‘‘is not a relevant reference for the hazard communication program’’ because it ‘‘likely will not contain specific employee exposure information’’ (Document ID 0299, p. 2). They suggested that OSHA cite to § 1910.120(l)(1)(i) (the Hazardous Waste Operations and Emergency Response (HAZWOPER) standard) instead and included proposed language to implement their suggestion. They also suggested adding a provision stating that the employer may limit employee requests for copies of SDSs to chemicals that the requesting employee was personally potentially exposed to (Document ID 0299, p. 2). 
OSHA disagrees with DOD’s 
suggestion that § 1910.1020 is not relevant and that § 1910.120 should be referenced instead. Rather, § 1910.1020 is the appropriate reference here. Paragraph (e) of the hazard communication standard has referenced OSHA’s Access to Employee Exposure and Medical Records standard since 1983. Section 1910.1020(c)(5) states that an ‘‘employee exposure record’’ means a record containing any of several kinds of information including a safety data sheet indicating a material may pose a hazard to human health (§ 1910.1020(c)(5)(iii)) and a chemical inventory or any other record that reveals the identity of a toxic substance or harmful physical agent and where and when it is used (§ 1910.1020(c)(5)(iv)). Paragraph (e)(1)(i) of the HCS (§ 1910.1200) requires that the written hazard communication program contain a list of the hazardous chemicals known to be 
present using a product identifier that is referenced on the appropriate safety 
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data sheet. Thus, the information a 
written hazard communication program is required to contain classifies the program as an employee exposure record within the meaning of § 1910.1020. Section 1910.1020 also contains specific access requirements, including the requirement to assure that employees are provided with records in a reasonable time, location, and manner and the requirement that employers assume the costs of records provision to employees and their representatives. Therefore, citing to § 1910.1020 for requirements pertaining to an employer’s written hazard communication program is appropriate regardless of whether the program contains any specific employees’ exposure information. 
On the other hand, § 1910.120(l)(1), 
which addresses the requirements for an emergency response plan under the HAZWOPER standard, is intended to cover only procedures for emergency response situations, does not reference exposure information, lacks the detailed access procedures included in § 1910.1020, and is not intended to cover all workplaces with hazardous chemicals. As such, it is less relevant to records access pertaining to routine and regular employee exposures than § 1910.1020. 
OSHA also disagrees with DOD’s 
suggestion that the agency amend paragraph (e)(4) to include a statement that an employer need only provide copies of a chemical’s SDS to an 
employee if the employee was potentially exposed to that chemical. This suggestion is beyond the scope of this rulemaking because OSHA only proposed a typographical revision to this section and did not propose any changes to the substance of paragraph (e)(4). OSHA notes that the HCS does not require employers to provide copies of SDSs to employees, only immediate access. Where an SDS constitutes an exposure record under 29 CFR 1910.1020(c)(5), then 1910.1020’s requirement to allow employee access (which includes the opportunity to examine and copy) would apply. 
For the reasons discussed above, 
OSHA has determined that § 1910.1020(e) is appropriate to reference for access requirements pertaining to written exposure control plans under HCS, rather than § 1910.120(l)(1). In the final rule, the agency has corrected the technical error and retained the reference to § 1910.1020. 
(f) Labels and Other Forms of Warning 
Paragraph (f) of the HCS provides 
requirements for labeling. In the NPRM, OSHA proposed to modify paragraphs 
(f)(1), (f)(5), and (f)(11), and also proposed a new paragraph (f)(12). 
Paragraph (f)(1) of the HCS, Labels on 
shipped containers, specifies what information is required on shipped containers of hazardous chemicals and also provides that hazards not otherwise classified (HNOCs) do not have to be addressed on these containers. OSHA proposed to revise paragraph (f)(1) to provide that, in addition to HNOCs, 
hazards resulting from a reaction with 
other chemicals under normal conditions of use do not have to be addressed on shipped containers. OSHA believed this information was not appropriate on containers because it might confuse users about the immediate hazards associated with the chemical in the container. However, because OSHA believed information on hazards resulting from a reaction with other chemicals under normal conditions of use is important for 
downstream users, the agency did not propose to change the existing requirements for these hazards to be indicated on SDSs (under Appendix D) and addressed in worker training where applicable (under paragraph (h)). OSHA also proposed to add the word ‘‘distributor’’ to the third sentence of paragraph (f)(1) to make it consistent with the first sentence. 
OSHA did not receive comments on 
inclusion of ‘‘distributor’’ in this paragraph, so the agency is finalizing that addition as proposed. OSHA received several comments on the proposal that ‘‘hazards resulting from a reaction with other chemicals under normal conditions of use’’ be exempt from inclusion on shipping labels. Michele Sullivan agreed with OSHA that including this information on the label could be confusing and potentially misleading, stating that including downstream hazards on the container could cause confusion with DOT requirements (Document ID 0366, p. 3). However, Cal/OSHA and Worksafe expressed concern that exempting this 
type of information from the label 
would withhold important information 
on chemical reactivity and hazards from 
workers throughout the supply chain 
(Document ID 0322, pp. 2–3, 15–16; 
0424, Tr. 166–168, 193–195; 0354, p. 5). Cal/OSHA also took issue with using the term ‘‘under normal conditions of use’’ as the trigger for the labeling exemption, contending that it is unrealistic to expect chemical producers to be able to accurately identify such situations. Cal/OSHA stated that chemical manufacturers would need to 
rely on assumptions about downstream uses and if a manufacturer relied on incorrect assumptions, this could result 
in essential chemical hazard information being withheld (Document ID 0322, pp. 13–14). 
OSHA disagrees with the assertion 
that not requiring this information on the shipping label would allow manufacturers to withhold important hazard information from workers. As explained in the NPRM, information about downstream hazards is required to appear in Section 2 (Hazard(s) Identification) of the SDS, which must be readily available to workers using the product. Additionally, omitting hazard information created from later chemical reactions from the label properly places the label’s emphasis on the hazards associated with the chemical in the container, while minimizing the potential for over-warning, which could mask the hazards to which workers are exposed. However, as discussed in the Summary and Explanation for paragraph (d), OSHA received many comments expressing uncertainty about what the agency meant by the term ‘‘under normal conditions of use.’’ Accordingly, in this final rule, OSHA has revised paragraph (d)(1) to remove the ‘‘under normal conditions of use’’ language and replace it with language that more clearly describes obligations for classification. Correspondingly, in paragraph (f)(1), this final rule removes the reference to ‘‘under normal conditions of use’’ and replaces it with a direct reference to paragraph (d)(1)(ii). As finalized, this change to paragraph (f)(1) maintains the proposed exemption but ensures consistency and minimizes confusion about which hazards are required on both the label and the SDS and which hazards are required solely on the SDS. 
Hach commented that OSHA should 
update (f)(1)(vi) to be consistent with the proposed changes in Appendix D to specify that the address and phone number of the responsible party should be the U.S. address and phone number (Document ID 0323, p. 11). OSHA is specifying that the address and telephone number of the chemical manufacturer, importer, or other responsible party required in Section 1 of the SDS, Identification, must be United States domestic, in order to minimize confusion on this point. As OSHA discussed in the NPRM, this change is not a new requirement, but clarifies the previously existing requirements of Appendix D, which requires that the name, address, and telephone number of the responsible party, such as the chemical manufacturer or importer, be listed on 
the SDS (86 FR 9722). OSHA explained in a 2016 LOI that when chemicals are 
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imported into the United States, the 
importer (defined by the HCS as being the first business with employees in the United States to receive hazardous chemicals produced in other countries for distribution in the United States) is the responsible party for purposes of compliance with the HCS and is required to use a U.S. address and U.S. phone number on the SDS (Document ID 0090). For the same reasons that OSHA is making this change in Appendix D (see the Summary and Explanation for Appendix D), OSHA agrees that the change should be made here as well. Therefore, this final rule revises (f)(1)(vi) to include ‘‘U.S.’’ before ‘‘address’’ and ‘‘telephone number.’’ 
OSHA also proposed to add a new 
paragraph, (f)(1)(vii), that would introduce a requirement that the label include the date a chemical is released for shipment. The agency proposed this change in conjunction with changes in paragraph (f)(11) related to relabeling of containers that are released for shipment but have not yet been shipped. The agency believed that providing the date a chemical is released for shipment on the label would allow manufacturers and distributors to more easily determine their obligations under paragraph (f)(11) when new hazard information becomes available. 
OSHA received numerous comments 
on this proposal. NAIMA supported the inclusion of a date for release for shipment on the basis that including such a date aligns with OSHA’s other proposed changes related to chemicals that have been released for shipment (Document ID 0338, p. 7). Tom Murphy commented that including a date on the label could benefit workers but suggested that OSHA change the title ‘‘Release for Shipment’’ to ‘‘Packaged for Shipment’’ to better reflect the intent of (f)(1) (Document ID 0277, p. 2). Many commenters, however, objected to or had concerns about the requirement of adding the release for shipment date on the label. Some raised practical objections, such as inadequate space on the label and lack of clarity about what the proper date would be (Document ID 0361, pp. 1–2; 0362, pp. 3–4). Many others questioned the need for such a requirement since manufacturers already track the date of manufacturing through various means such as lot numbers or manufacturing dates (Document ID 0327, p. 4; 0359, p. 3; 0323, pp. 8–9; 0315, pp. 1–2; 0321, p. 1; 0333, p. 1; 0339, p. 2; 0340, pp. 4– 5; 0348, p. 2; 0349 p. 1; 0423, Tr. 103, 195–196, 210–216; 0424, Tr. 21). For 
example, Epson America, Inc. (Epson) commented that the proposed requirement was ‘‘not necessary and meaningless’’ and that the proposal did not make clear which date to use (Document ID 0288, p. 1). NPGA, Dow, and Hach also commented that a required date on the label would add unnecessary burdens and create confusion (Document ID 0364, pp. 1–2; 0359, pp. 3–4; 0323, pp. 8–9). IMA–NA suggested that such a date would not 
bear a connection to when the container 
was actually ready to ship (Document ID 0363, p. 8). Michele Sullivan commented that requiring the date on the label was contrary to international harmonization because the GHS does not have such a requirement (Document ID 0366, p. 4). Similarly, Hach observed that other international partners (e.g., Canada) do not require the date of release for shipment on the labels (Document ID 0323, pp. 8–9). 
Some commenters indicated that 
OSHA underestimated the burden of this requirement since either manufacturers would need to modify their processes or the new requirement would preclude the use of pre-existing labels, which save manufacturers time and cost (Document ID 0290, p. 1; 0315, pp. 1–2; 0358; p. 2; 0324, pp. 2–3, 7; 0359, pp. 3–4; 0323, pp. 8–9; 0424, Tr. 21; 0425, Tr. 73; 0368, p. 6). Others questioned whether the proposal would create issues with labeling requirements imposed by other agencies. For example, ILMA commented that some of their members are also regulated by FDA and the use of a ship date as opposed to a batch code may violate FDA regulations (Document ID 0444, p. 6). Several commenters commented that the addition of this date on the label could create confusion with very little benefit. AmeriGas stated that a ‘‘released for shipment’’ date could lead to confusion with DOT requalification dates (Document ID 0423, Tr. 210–216), and SAAMI suggested that there could be confusion with expiration dates (Document ID 0421, p. 2). 
In addition, HCPA, ACC, and others 
recommended that OSHA allow manufacturers and importers to use 
their own methods to track their 
inventory throughout distribution rather 
than require an additional date on the 
label (Document ID 0301, p. 1; 0315, pp. 1–2; 0327, p. 5; 0324, pp. 3, 7; 0423, Tr. 103). A comment jointly submitted by the Compressed Gas Association (CGA) and the Gases & Welding Distributors Association (GAWDA) recommended that the date be optional to provide manufacturers flexibility, especially those that reuse containers and inspect labels regularly (Document ID 0310, pp. 1–2). OSHA appreciates the various views 
and comments submitted by 
stakeholders. The agency finds compelling the arguments that the date a chemical was released for shipment is not needed on labels because this information is already available through other means and that the addition of the date could cause confusion for downstream users due to other (non- HCS) date requirements on the label. Since OSHA indicated in the NPRM that the primary reason to include the ‘‘release for shipment’’ date was to aid manufacturers and distributors in complying with (f)(11), the agency finds it relevant that manufacturers and distributors believe they already have adequate means to track their inventory (86 FR 9698). OSHA therefore concludes it is unnecessary to require dates be included on the label and is not including this proposed requirement in the final rule. 
Paragraph (f)(5) specifies label 
requirements that apply to the transport of hazardous chemicals from workplace to workplace. In the NPRM, OSHA proposed to add the heading ‘‘Transportation’’ to this paragraph. The agency received no comments on the proposed new paragraph heading, so is finalizing the heading ‘‘Transportation’’ as proposed. In addition, OSHA is making one technical correction to (f)(5)(i). The citation for the requirements of the Hazardous Materials Transportation Act has been changed from 49 U.S.C. 1801 et seq. to 49 U.S.C. 5101 et seq. OSHA has updated the 
reference. 
Finally, OSHA proposed to add two 
new subparagraphs to (f)(5) that specify requirements related to the transportation of hazardous chemicals. OSHA proposed to add a new paragraph (f)(5)(ii) to address the transportation of bulk shipments of hazardous chemicals (i.e., in tanker trucks, rail cars, or 
intermodal containers). The proposed paragraph would specify that labels for bulk shipments of hazardous chemicals may either be on the immediate container or may be transmitted with shipping papers, bills of lading, or by other technological or electronic means so that the information is immediately available in print to workers on the receiving end of the shipment. 
OSHA received numerous comments 
on this proposed provision. Several 
comments supported the proposed paragraph. ILMA indicated that the option of using either physical or technological means to transmit the information was beneficial (Document ID 0365, p. 12). ADM supported the proposed language, finding it to be in full agreement with pre-existing OSHA 
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guidance and industry practice 
(Document ID 0361, p. 2). Similarly, FCA supported the addition of paragraph (f)(5)(ii) as long as the term bulk shipment is not expanded to encompass intermediate containers (Document ID 0345, pp. 5–6). OSHA notes that the regulatory text narrowly defines bulk shipment to include only 
tanker trucks, rail cars, and intermodal containers. 
NAIMA, Hugo Hidalgo, and Ameren 
also supported the proposed new paragraph, stating it provided needed clarity (Document ID 0297, pp. 2–3; 0309, pp. 11, 16; 0338, p. 7). National Refrigerants, Inc. (NRI) supported the addition of (f)(5)(ii) but requested that OSHA permit sending the label electronically just once for multiple shipments with the same materials (Document ID 0326, p. 7). Similarly, NACD and a comment submitted jointly by the Association of American Railroads (AAR) and the American Short Line and Regional Railroad Association (ASLRRA) stated that there need only be one electronic transmission of a label if multiple shipments are made of the same material (Document ID 0329, pp. 3–4; 0351, pp. 2–4; 0465, pp. 3–4). OSHA disagrees with these suggested changes since sending the label just once would not provide the label to the receiver of each shipment at the time of delivery. The intent of (f)(5)(ii) is to ensure the label is immediately available to the person receiving the shipment while recognizing advances in technology that allow manufacturers or suppliers alternate methods of ensuring a hard copy is available. 
While IPHMT and NPGA also 
supported the addition of (f)(5)(ii), they requested that OSHA revise the paragraph to read as follows: ‘‘It is permissible for the label for bulk packaging of hazardous chemicals to be on the container in a manner that does not conflict with the requirements of the Hazardous Materials Transportation Act (49 U.S.C. 1801 et seq.) [now 49 U.S.C. 
5105 et seq.] and regulations issued 
under that Act by the Department of Transportation, or to be transmitted with the shipping papers, bills of lading, or other technological or electronic means so that it is immediately available to workers in printed form on the receiving end of the shipment.’’ These commenters stated that their proposed language would clarify that OSHA does not intend to prohibit markings required by DOT (Document ID 0336, p. 2; 0364, pp. 5–6). OSHA does not agree that this change is 
needed, since (f)(5)(i) already provides that labeling used to comply with the HCS must not conflict with the 
Hazardous Materials Transportation Act (49 U.S.C. 1801 et seq.) [now 49 U.S.C. 
5101 et seq.] and regulations issued under that Act by DOT. 
Toby Threet also supported, in 
general, the provision for sending electronic labels, with a minor edit to clarify that it is not the worker who should be in printed form (Document ID 0279, p. 3). OSHA is not convinced that 
the language as proposed is truly 
ambiguous and in need of clarification. 
Dow requested a slight change to the 
proposed text to allow for greater latitude for where to affix the label on the bulk shipping container, suggesting OSHA change ‘‘may be on the immediate container’’ to ‘‘may be attached or affixed to the immediate container’’ (Document ID 0359, p. 2). DGAC expressed similar support for revisions that would allow for flexibility of label placement (Document ID 0339, p. 2). OSHA disagrees that this language is necessary or adds any additional flexibility. OSHA already allows flexibility in its definition of label in paragraph (c). The definition notes that labels may be affixed to, printed on, or attached to the immediate container (or outside packaging). Therefore, OSHA is maintaining the language as proposed. 
NACD and others questioned the need 
for a label on a bulk shipping container, suggesting that since the DOT placard and SDS are already required, the end user will have the necessary safety and health information without a label (Document ID 0329, pp. 3–4; 0315, p. 2). OSHA disagrees with this assertion. OSHA does not require the SDS to accompany the actual shipment of the chemical and therefore it may not be immediately available upon delivery (although it must be readily accessible to employees). Also, the DOT placard does not include the full range of hazards covered by the HCS. Additionally, Idemitsu Lubricants America Corporation (ILA) suggested that a hard copy of the label was not 
necessary since the storage container on the receiving side should already be appropriately labeled (Document ID 
0315, p. 2). OSHA disagrees, since the 
person who is unloading the material 
from the bulk shipment may not have 
immediate access to the storage vessel 
and its label. 
NIOSH commented that proposed 
(f)(5)(ii) was practical and would not 
result in additional risk to the worker. However, NIOSH recommended that OSHA have a mechanism to verify that the label information is transmitted (Document ID 0281, Att. 2, p. 4). OSHA agrees that some sort of acknowledgement or acceptance of this information from the end user is 
important to ensure that the information is appropriately received. Therefore, in this final rule OSHA is revising the proposed language to include that if the label is transmitted in a means other than a label on the bulk shipment container or in printed form, the recipient of the shipment must agree to receive the labels by an alternate method. OSHA is also revising the word ‘‘may’’ to ‘‘must’’ in the first sentence of (f)(5)(ii) to clarify that the label preparer must choose one of the options provided in the paragraph. 
Both Cal/OSHA and Worksafe 
objected to permitting shippers to send labeling information electronically, expressing concern that this method could leave workers who handle containers during shipment unaware of their contents and leave emergency responders unaware of the presence of hazardous materials and unable to respond safely to an emergency that occurs during shipment (Document ID 0322, pp. 2, 14–15; 0375, pp. 2, 14–15; 0354, p. 5). DOT has jurisdiction over hazardous chemicals while they are in transport and has provided alternate methods to ensure the safety of people transporting hazardous materials via packaging and labeling as well as to ensure that emergency responders are aware of the hazards in case of an emergency. The HCS, in contrast, is concerned with chemical hazards in the workplace after transport has concluded. The purpose of providing the HCS label either on the bulk shipping container or with the bill of lading is to ensure that the downstream recipient has the information immediately upon delivery. This long- standing requirement ensures that the recipient has the information immediately while not posing any potential conflicts with the placarding required by DOT. 
Steven Wodka expressed concern that 
permitting electronic transmission of labels will result in workers on the receiving end of the shipment not having necessary hazard information quickly enough. Wodka stated that warning labels should appear at the point of danger where they would be most effectively seen, and that permitting electronic transmission of labels will lead to a delay between the bulk shipment’s arrival at the customer’s plant and the placement of the appropriate label, even at the most OSHA-compliant workplaces (Document ID 0312, pp. 2–5). As noted above, to further address the concern that labels should be immediately 
available at the point of danger, OSHA is revising the proposed language of 
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(f)(5)(ii) to include a requirement that 
the recipient of a shipment must agree to receive labels electronically. OSHA believes that the proposed regulatory language requiring that labels be ‘‘immediately available to workers in printed form on the receiving end of shipment,’’ coupled with the new language in the final version requiring recipients to consent to electronic delivery of labels, addresses the delay concerns. 
If a manufacturer, importer, or 
distributor uses electronic transmission of product labels for bulk shipments, they must ensure the recipient chooses to ‘‘opt-in’’ to accept the electronic transmission. A downstream user/ recipient may choose to ‘‘opt-out’’ of an electronic distribution system from a manufacturer, importer, or distributor at any time. If a downstream user/recipient does opt out, the manufacturer, importer, or distributor must then ensure a product label is on each bulk shipment in accordance with paragraph (f)(1) or provide a hard copy of the product label with shipping papers or bills of lading. As a note, this provision does not change the existing obligations of the downstream employer to ensure that any chemical container in the workplace is labeled in accordance with paragraph (f)(6) before any worker uses the chemical. A tanker truck or railroad tank car may be labeled in accordance with paragraph (f)(7) when considered a stationary process container. 
In sum, OSHA is finalizing paragraph 
(f)(5)(ii) with revisions to clarify that the label may be electronically transmitted only with agreement from the receiving end. Electronic transmission of product labels for bulk shipment may be accomplished in numerous ways through various electronic platforms including computer systems, facsimile, or bar or QR code, as long as the product label is immediately available in printed form on the receiving end of the shipment. 
As discussed in the NPRM, under the 
2012 HCS, Appendix C paragraph C.2.3.3 provides that where a pictogram required by DOT appears on a shipped container, the HCS pictogram for the same hazard (specified in C.4) shall not appear. This provision was intended to prevent confusion associated with having two different representations of 
the same hazard on the container (77 FR 17728). However, since 2012, DOT has updated its regulations to indicate that it does not consider the HCS pictogram to conflict with the DOT pictogram, and based on this, OSHA no longer believes that having both pictograms will create confusion for workers handling the chemical (49 CFR 172.401). Accordingly, in the NPRM OSHA 
proposed to: (1) delete the language currently in paragraph C.2.3.3 from Appendix C and (2) add new paragraph (f)(5)(iii) to provide that where a DOT pictogram appears on a shipped container, the Appendix C pictogram for the same hazard is allowed, but is not required, on the HCS label. 
For example, in the case where a 
chemical is shipped in only its immediate container, such as a 55- gallon drum containing a flammable liquid, both a DOT label and an OSHA- compliant label would be required. Under the 2012 standard, the flame pictogram on the OSHA-compliant label would be prohibited because the DOT label would contain the equivalent pictogram. The proposed change would allow, but not require, the flame pictogram to appear on the OSHA- compliant label. This means chemical manufacturers could use the same labels for shipping containers and for containers that are solely used in the workplace; this would avoid information loss and eliminate the need to develop or print additional labels. 
OSHA received several comments 
relevant to this proposed change. ILMA supported harmonizing the HCS with DOT because it will ‘‘reduc[e] confusion regarding hazards, not only for workers but for the businesses that must juggle two different labeling rules’’ (Document ID 0356, p. 12). IPHMT commented that the proposed regulatory language did not make it sufficiently clear that adding the HCS pictogram was permissible but optional, rather than required. They requested the agency amend the proposed language to clarify that the addition of the HCS pictogram with the DOT pictogram is permissible but not required (Document ID 0336, p. 3). OSHA disagrees that additional language is needed; the proposed regulatory text states clearly that the HCS pictogram ‘‘is not required on the label.’’ NPGA and IPHMT also commented that the agency had not made a compelling case that no confusion would ensue if both pictograms were required and this might affect emergency responders’ response (Document ID 0336, p. 3; 0364, p. 6). However, these commenters did not provide any evidence that there would be or has been confusion due to two distinctly different pictograms. OSHA notes that the DOT placard is larger than and separate from the OSHA-compliant label, enabling emergency responders to distinguish between the two types of labels. Moreover, these commenters provided no reason for OSHA to 
disagree with DOT’s conclusion, based on that agency’s experience and expertise, that confusion should not 
arise from inclusion of both pictograms. 
SOCMA supported the proposed 
change, stating that ‘‘DOT has updated its regulations to indicate that it does not consider the HCS pictogram to conflict or cause confusion with the DOT pictogram for the same identified hazard. This provision simply harmonizes labeling regulations between OSHA and DOT while simplifying the dual labeling requirements for regulated entities’’ (Document ID 0367, p. 5). 
DOD asked OSHA to clarify whether 
the HCS pictogram is permitted or required once the container reaches its destination (Document ID 0299, p. 2). OSHA intends that if the immediate container bears a DOT pictogram, the same pictogram does not need to also be on the HCS label, as long as the DOT pictogram is not removed or defaced. The end user would not need to add the corresponding HCS pictogram. 
NACD suggested alternate language to 
distinguish between DOT terminology for ‘‘marking’’ a shipping container and OSHA terminology for ‘‘labeling’’ hazardous chemicals. They suggested that OSHA remove two references to ‘‘the label’’ from proposed (f)(5)(iii) (Document ID 0329, p. 4). OSHA partially agrees that the use of the term ‘‘the label’’ for both DOT requirements and OSHA requirements may be confusing because DOT sometimes uses the term marking rather than labeling. However, the use of the term ‘‘on the label’’ to reference OSHA labeling is appropriate. Therefore, OSHA is removing the first reference to ‘‘the label’’ from the text of (f)(5)(iii); the text as finalized reads, ‘‘Where a pictogram required by the Department of Transportation under Title 49 of the Code of Federal Regulations appears on a shipped container, the pictogram specified in Appendix C.4 of this section for the same hazard is not required on the label.’’ 
NACD also suggested that OSHA 
require that the pictogram(s), hazard 
statement(s) and signal word(s) be in the same field of view as the DOT’s hazard class symbol, so workers could view all hazard information at once, in order for the HCS pictogram to not be required (Document ID 0329, p. 4). OSHA disagrees with this suggestion. The DOT markings are used for different purposes and the size and location may be dictated in such a way that it would not be feasible to have them in the same field of view. Therefore, the agency is finalizing (f)(5)(iii) as proposed with the exception of removing the phrase ‘‘the label for’’ where it referred to DOT requirements. 
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In the 2012 HCS, paragraph (f)(11) 
requires that chemical manufacturers, 
importers, distributors, or employers who become newly aware of any significant information regarding the hazards of a chemical revise the labels within six months of becoming aware of the new information and ensure that labels on containers of hazardous chemicals shipped after that time contain the new information. OSHA recognizes that, on some occasions, a chemical manufacturer or importer may become aware of significant hazard information after a chemical has already been labeled but before it is shipped. Therefore, in the NPRM OSHA proposed to add a sentence to paragraph (f)(11) providing that chemicals that have been released for shipment and are awaiting future distribution need not be relabeled; however, the chemical manufacturer or importer must provide the updated label for each individual container with each shipment. The purpose of these changes is to account for the long distribution cycles of some products and the potential hazards workers could face in relabeling the immediate containers of hazardous chemicals that have already been prepared for shipment. 
Following publication of the 2012 
updates to the HCS, OSHA received feedback related to difficulties some chemical manufacturers were having complying with paragraph (f)(11), particularly in the case of chemicals that travel through long distribution cycles (see 86 FR 9699). Many products have straightforward supply chains and are packaged, labeled, and promptly shipped downstream. Other products, for example in the agrochemical sector, are packaged and labeled when they leave the chemical manufacturer’s facility, but they may reside at a warehouse or distribution facility for extended periods of time (e.g., several years) before being shipped downstream. There are also instances where products may be returned from the downstream users to the distribution facility and then shipped to other customers (86 FR 9699). 
In addition to the compliance 
difficulties noted by manufacturers, OSHA is aware that the act of relabeling (or in some cases repackaging) these products in warehouses or distribution facilities has the potential to pose occupational safety and health risks to employees. Relabeling each individual container may require that employees open already secure packaging, a process that may result in workplace hazards such as the potential for chemical exposures. OSHA has previously recognized the 
complexities involved with relabeling 
existing stock of hazardous chemicals. Following promulgation of the 2012 HCS, the HCS compliance directive (Document ID 0007) provided enforcement guidance on the labeling of existing stock. Before June 1, 2015 (for manufacturers and importers), and before December 1, 2015 (for distributors), OSHA permitted chemical manufacturers, importers, and distributors with existing stock that was 
packaged (e.g., boxed, palletized, shrink 
wrapped, etc.) for shipment and labeled in accordance with the pre-2012 version of the HCS to ship those containers downstream without relabeling the containers with HCS 2012-compliant labels. However, the chemical manufacturer or importer generally had to provide an HCS 2012-compliant label for each individual container shipped and the appropriate HCS 2012- 
compliant SDS(s) with each shipment. After those deadlines, employers were required to ensure that each container was labeled with an HCS 2012- compliant label prior to shipping. OSHA used this enforcement policy as a basis for the proposed revisions to paragraph (f)(11). OSHA sought commenters’ input on whether the proposed changes would adequately address issues associated with relabeling in cases of long distribution cycles, whether the proposed changes would provide sufficient flexibility, and whether the proposed revisions would 
alleviate safety concerns that would otherwise be associated with the 
relabeling of packaged stock. 
OSHA received numerous comments 
on this proposed provision. A comment jointly submitted by the Fertilizer Institute (TFI) and the Agricultural Retailers Association (ARA) supported the proposal and stated that it would reduce their burden without impacting the hazard information (Document ID 0340, pp. 4–5). Tom Murphy supported the provision but indicated it could be clearer if the agency changed the term ‘‘release for shipment’’ to ‘‘packaged for shipment’’ (Document ID 0277, p. 2). NIOSH, NAIMA and Ameren also expressed support, noting that the provision would allow manufacturers with long distribution cycles the opportunity to send updated labels with the shipment while avoiding unnecessary risk to workers (Document ID 0281, Att. 2, p. 4; 0338, p. 7; 0309, p. 11). NIOSH recommended that clear responsibility be established to ensure labels accompany shipment. OSHA agrees; it is the responsibility of the originator to ensure updated labels 
accompany the shipment. 
Some commenters expressed 
confusion about what the proposed provision would require; in particular, they appeared to interpret the proposed 
provision as mandatory rather than 
optional. API and Michele Sullivan urged OSHA to make the proposed provision optional, as it would not be relevant to many supply chain operations (Document ID 0316, pp. 4–5; 0366, p. 4). NAPIM appeared to read the proposed provision as requiring manufacturers to place an updated label on each container that had already been prepared for shipment (Document ID 0317, p. 2). NPGA and a comment jointly submitted by CGA and GAWDA stated that the proposed provision would be inappropriate for manufacturers of cylinder gas products and urged the agency not to include it in the final rule (Document ID 0310, p. 2; 0385, p. 2; 0364, p. 4). OSHA notes that the proposed provision was intended to be optional and is revising the language in the final version to clarify that manufacturers have the option to adopt the provision’s alternate labeling procedures but are not required to do so. Manufacturers, distributors and importers can always follow the requirements for updating labels as laid out in the first part of (f)(11). OSHA is also revising the title of paragraph (f)(11) from ‘‘Release for Shipment’’ to ‘‘Label Updates’’ to better reflect the true purpose of this provision: providing requirements for updating information on labels. This change is similar to a suggestion submitted by Toby Threet, that OSHA should revise the title ‘‘to something more representative of the entire paragraph, such as ‘Revision of Labels’’’ (Document ID 0279, p. 5). 
Some commenters conditioned 
support for the changes on OSHA eliminating or adjusting the correlating proposed requirement to add the date of ‘‘release for shipment’’ on the label (Document ID 0327, p. 5; 0347, Att. 1, pp. 9–11; 0361, p. 1). As discussed above, OSHA has decided not to adopt its proposed requirement to include the ‘‘release for shipment’’ date on the label in this final rule. 
Other commenters, while supporting 
this provision in principle, did not 
support shipping the updated label with the shipment. Several commented that doing so would inappropriately place the burden on the downstream user to update the label on site. For example, the Medical Device Transport Council (MDTC) strongly supported the relief from relabeling that (f)(11) would afford but did not support placing the burden 
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on subsequent distributors and 
customers to apply the updated labels to the containers (Document ID 0358, pp. 2–3). Likewise, DGAC commented that it does not support this provision as it places the burden on subsequent distributors and their customers (Document ID 0339, p. 3). Similarly, others including Dow commented that shipping unaffixed labels could create issues with safety and raise liability issues, and that there would be no way to ensure that relabeling would even take place (Document ID 0349, p. 1; 0359, pp. 2–3; 0368, pp. 5–6). The agency believes that the commenters are exaggerating the nature of any additional burden on downstream users. The purpose of the accommodation proposed in (f)(11) is to avoid the burdens and hazards that can come with 
relabeling containers in a specific, 
narrow set of circumstances, while still providing the up-to-date information to 
downstream users. If upstream 
manufacturers are concerned about liability, they can opt not to take advantage of this optional accommodation and instead update the label at the point of shipment. 
Other commenters requested 
flexibility on how and when to send the labels downstream, such as sending them electronically and/or in advance of the shipment, or suggested it is not necessary to send updated labels at all since the downstream user already has the information on the SDS (Document ID 0279, p. 5; 0297, pp. 5–7; 0319, p. 2; 0327, p. 5; 0345, pp. 4–5; 0349, p. 1; 0368, pp. 5–6). ACI indicated that new processes would need to be put in place to provide the updated label (Document ID 0319, p. 2). However, it is important to ensure that downstream users have the most up-to-date information at the time the hazardous chemical is received. Allowing the label to be sent separately from the shipment or relying on the SDS would fail to ensure that the downstream user has the updated label with each container. OSHA again notes that this provision is optional, so if a manufacturer does not have a mechanism to provide the updated label with the shipment or is concerned about liability, they can relabel each container prior to shipment. 
Several commenters stated that they 
found the term released for shipment to 
be confusing (Document ID 0329, p. 4; 0465, p. 4; 0324, p. 3). OSHA is adding a definition of released for shipment in the final rule (see the Summary and Explanation discussion for paragraph (c)). 
Cal/OSHA opposed the proposed 
update, characterizing it as an ‘‘additional delay in relabeling’’ that would ‘‘expose[ ] workers throughout 
the supply chain to undisclosed chemical hazards’’ (Document ID 0322, p. 15). OSHA disagrees that the proposed provision will cause a delay in downstream workers receiving the correct label information because it would require updated labels to be sent together with every shipped container. 
In providing this accommodation OSHA 
is providing flexibility to manufacturers in a way that minimizes potential hazards to upstream workers who could be exposed to hazards due to relabeling while still providing the updated label information with the shipped product within the required timeframe. 
Finally, several commenters requested 
clarification about aspects of the proposed provision. NRI asked whether this accommodation applies to any container filled, sealed, and labeled by the manufacturer before the expiration of the six-month deadline (Document ID 0326, p. 6). The answer is yes. NRI also asked whether the provision would apply to labels on a chemical’s immediate container as well as labels on immediate outer packages holding small containers (Document ID 0326, p. 6). This answer is also yes: this accommodation would apply to containers within an immediate outer package, as long as the immediate outer package is already released for shipment. 
The Vinyl Institute asked whether the 
exception applies when the immediate container is filled and labeled, but the immediate container has not yet been placed in its kit or outer container, palletized, and/or shrink wrapped (Document ID 0369, pp. 8–9). PLASTICS supported the proposed provision but suggested a supplemental statement to state that: ‘‘The ‘released for shipment’ criterion would be satisfied if the immediate container were filled, sealed, and labeled by the deadline even if the immediate container (1) has not yet been placed in its kit or outer container, palletized, and/or shrink wrapped, or (2) the product is on a temporary QA hold and is subsequently cleared for distribution’’ (Document ID 0314, p. 19). In the Vinyl Institute’s question and in PLASTICS’ suggestion, it appears that the immediate containers still would need to be packaged for shipment, so 
they would not meet the definition of released for shipment discussed previously in the Summary and Explanation for paragraph (c), and the 
exception would not apply. 
IMA–NA asked OSHA to implement 
staggered timelines for label updates 
based on the severity of the hazard, indicating that a Class 1 hazard should have a short timeline and a Class 2B hazard could wait as much as twelve 
months for new labeling (Document ID 0363, p. 8). This comment is out of scope for this rulemaking since OSHA did not propose to change the basic schedule for updating labels after learning of new hazard information. In addition, the agency believes downstream users must have the updated information available on the immediate container as quickly as possible regardless of the severity of the hazard. 
For the reasons discussed above, 
OSHA is modifying the proposed text for (f)(11) to make clear that for chemicals that have been released for shipment and are awaiting further distribution, the chemical manufacturer, importer, or distributor has the option not to relabel after learning significant new hazard information. However, if they choose to take that option, they must produce updated labels for each container and send those labels with the shipment for the downstream users. 
Finally, OSHA proposed a new 
paragraph, (f)(12), to address small container labeling. The 2012 HCS required that all shipped containers be labeled with the information specified in paragraph (f)(1). Many stakeholders have told OSHA that they have difficulty including all of the required information from paragraph (f)(1) on the labels they use for small containers. In some cases, the information becomes too small for a person to read it, and while it is sometimes possible to use alternate types of labels (such as pull- out labels or tags), it is not always feasible to do so (86 FR 9699). In response to these concerns, through LOIs and the HCS compliance directive, OSHA provided a practical accommodation to address situations where it is infeasible to provide all HCS- required label information directly on small containers through the use of pull- out labels, fold-back labels, or tags (see 86 FR 9699). This practical accommodation allows limited information to be included on the small container label, but requires complete label information to be provided on the outside packaging. In the NPRM, OSHA proposed to incorporate this practical accommodation into the standard in new paragraph (f)(12). 
OSHA proposed that all of the new 
small container labeling provisions 
apply only where the chemical manufacturer, importer, or distributor can demonstrate that it is not feasible to use pull-out labels, fold-back labels, or tags containing the full label information required by paragraph (f)(1). Proposed paragraphs (f)(12)(ii)(A)–(E) would provide that labels on small 
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containers that are less than or equal to 
100 milliliter (ml) capacity must include, at minimum: product identifier; pictogram(s); signal word; chemical manufacturer’s name and phone number; and a statement that the full label information for the hazardous chemical is provided on the immediate outer package. Proposed paragraph (f)(12)(iii) would provide that no labels are required for small containers of 3 ml capacity or less where the chemical manufacturer, importer, or distributor can demonstrate that any label would interfere with the normal use of the container; however, that same proposed provision states that if a container meets the conditions of (f)(12)(iii) and no label is required, the container must bear, at minimum, the product identifier. For example, the product identifier (e.g., 
chemical name, code number or batch 
number) could be etched on a 3 ml glass vial (container) to ensure that the 
identifier remains fixed to the vial. This 
type of identification would ensure that the chemical in the small container can be identified and matched with the chemical’s full label information. 
Proposed paragraph (f)(12)(iv) would 
provide that for any small container covered by paragraph (f)(12)(ii) or (iii), the immediate outer package must include the full label information required by paragraph (f)(1) for each hazardous chemical in the immediate outer package, along with a statement that the small container(s) inside must be stored in the immediate outer package bearing the complete label when not in use. This proposed provision would also state that labels affixed to the immediate outer package must not be removed or defaced, as required by existing paragraph (f)(9). 
OSHA intended these proposed 
changes to provide chemical manufacturers, importers and distributors with flexibility in labeling small containers. The proposal was consistent with the small packaging examples provided in the GHS Annex 7: Examples of Arrangements of the GHS Label Elements (Document ID 0197, pp. 431–436), and would result in better alignment with Health Canada’s HPR small capacity container requirements (Document ID 0051). Specifically, the HPR, under 5.4(1), provides exemptions from certain labeling requirements (such as precautionary statements) for small capacity containers of 100 ml or less. In addition, under 5.4(2), the HPR provides labeling exemptions for containers of 3 ml or less if the label interferes with the normal use of the hazardous product. OSHA requested comments on the 
feasibility of the proposed small container labeling provisions as well as whether the proposed changes would 
improve safe handling and storage for chemicals in small containers. 
OSHA received numerous comments 
on proposed paragraph (f)(12). Most commenters supported adoption of (f)(12) (Document ID 0281, Att. 1, p. 4; 0309, p. 16; 0316, p. 6; 0323, pp. 6–8; 
0329, pp. 5–6; 0338, pp. 7; 0339, pp. 3– 
4; 0345, p. 3; 0346, pp. 1–2; 0347, Att. 1, pp. 12–13; 0349, p. 1; 0359, p. 4; 0361, pp. 2–3; 0366, p. 4; 0367, p. 3). FCA described proposed (f)(12) as a ‘‘substantial improvement’’ and ‘‘strongly urge[d]’’ adoption of the provision (Document ID 0345, p. 3). The Flavor and Extract Manufacturers Association agreed that trying to include all the information required on a full- sized label on small packages is infeasible and voiced support for the flexibility that (f)(12) would provide (Document ID 0346, pp. 1–2). NAIMA called proposed (f)(12) a ‘‘common sense’’ solution (Document ID 0338, p. 7). While API noted that the addition of proposed paragraph (f)(12) to the HCS would likely impact laboratory samples, they indicated no concerns about adding it (Document ID 0316, p. 6). 
Other commenters, while supporting 
this accommodation, had additional recommendations. ACC voiced general support for adding paragraph (f)(12) but recommended that the agency expand full relief to any container below 100 ml, eliminating the need for separate provisions for 3 ml and 100 ml (Document ID 0347, Att. 1, pp. 12–13; 0406, Att. 1, pp. 12–13). OSHA disagrees with this recommendation. The information on the immediate container is essential for worker safety and most containers, except for the very smallest, have enough room on the immediate container (either attached directly or with the use of tags or pull- out labels) to provide at least minimal information. 
NACD and Loren Lowy recommended 
that the small package label also reference the SDS (Document ID 0329, 
pp. 5–6; 0333, p. 1; 0465, pp. 4–5). OSHA does not believe this is necessary. Workers should already be trained on the hazards they are exposed to and have ready access to the SDSs. Space on small containers is at a premium and including unnecessary references to the SDS might detract from the hazard information. However, NACD or others can add this statement if they deem it appropriate. 
NIOSH recommended that outer 
packages be ‘‘water resistant’’ (Document ID 0281, Att. 1, p. 4). While OSHA believes ‘‘water resistant’’ packaging might be beneficial, this suggestion is beyond the scope of this rulemaking because OSHA did not 
propose any new requirements related to the durability of labels. 
Hach supported the small package 
labeling provision but suggested that 
OSHA eliminate the requirement to include a U.S. phone number, stating that this takes up valuable label space and reduces harmonization with trading partners such as Canada and Mexico (Document ID 0323, pp. 6–8). OSHA disagrees with this suggestion. The phone number should be maintained on the label since this provides the worker with immediate access to where they can seek additional information if the SDS is not in the immediate vicinity. 
Givaudan, PLASTICS, the Vinyl 
Institute, and ACA suggested that OSHA 
eliminate the need to show infeasibility while ICT requested that OSHA explain what the agency means by ‘‘demonstrating that it is not feasible’’ (Document ID 0293, p. 1; 0314, pp. 17– 18; 0369, p. 9; 0324, p. 4; 0368, pp. 7– 9). Michele Sullivan also noted that neither Canada nor the GHS requires proof of infeasibility (Document ID 0366, p. 4). OSHA maintains that requiring a showing of infeasibility is appropriate. It is imperative that, wherever possible, workers have the full label information on the immediate container to ensure safe use at all times. If this is demonstrated to be not feasible (for example, due to space considerations or extraordinary economic considerations), then OSHA has provided a way to minimize these impacts while still providing valuable information to workers. The label provides a concise, immediate, and conspicuous visual reminder of chemical hazards at the site where the chemical is used; reducing this information where it is feasible to provide the entire label would reduce protections for the downstream user of the chemicals. Relatedly, Ameren commented that prior approval should not be required for using the abbreviated labels (Document ID 0309, p. 12). To clarify, new paragraph (f)(12) would not require prior approval, only that the company must demonstrate that the full label was infeasible. 
HCPA’s comment supported the 
agency’s efforts, but requested that OSHA follow the approach of Canada, which does not require entire label 
elements on the outer package (Document ID 0327, pp. 5–6). OSHA believes that not having this information on the immediate outer package would be a reduction in protections that the HCS currently affords and removing this information would not provide any benefits other than aligning with Canada. While OSHA strives to align 
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with Canada where possible, OSHA’s 
primary mission is to protect workers. OSHA believes providing the full label on the immediate outer package is appropriate and provides the workers downstream with the information they need. 
While not endorsing or disagreeing 
with the proposal, Epson asked if OSHA would offer the same exemptions as the EU CLP regulation which provides exemption for containers not exceeding 125 ml (Document ID 0288, p. 1). OSHA has chosen to provide labeling flexibility for containers of 100 ml or less because OSHA believes that the information on the immediate container is essential and the chemicals even in very small containers can be extremely hazardous. OSHA’s determination to place the cut-off at 100 ml also aligns with Canada’s small container labeling requirements and therefore serves the important purpose of consistency with our largest trading partner. Hach asked for the 3 ml limit for very small containers to be raised to 5 ml and provided photos in comments and testimony to demonstrate their concerns (Document ID 0323, pp. 6–8; 0425, Tr. 83–84). OSHA believes, however, that 3 ml is the appropriate cut-off for a total exemption of hazard information. This cut-off is consistent with Canada’s requirements for small container labeling, and while Hach provided pictures of small containers of less than 5 ml, there is no indication that a label would interfere with the use of the product. 
PLASTICS expressed concern about a 
‘‘mixed kit’’ scenario, where an outer package would contain smaller containers of varying sizes or where some containers in a kit do not contain hazardous materials and would not be covered by the HCS, and proposed alternate regulatory language that would accommodate this type of situation (Document ID 0314, pp. 18–19). PLASTICS also requested that OSHA permit downstream users to relabel containers in such a scenario. While OSHA acknowledges that a ‘‘mixed kit’’ scenario might pose challenges in applying this accommodation, OSHA does not believe that the appropriate response is to move the responsibility of labeling the immediate container to the downstream users. This would require each downstream user to open each kit and figure out which container would need to be relabeled, creating the potential for mislabeling. OSHA already provides multiple flexibilities, including the use of attached tags which can be applied to the immediate outer 
container for the full information. Rev. 8 shows several different options on how to label ‘‘kits’’ in Annex 7 (example 
10—scenario A and B) (Document ID 0065, pp. 451–457). 
Toby Threet suggested regulatory text 
changes for proposed paragraph (f)(12). Threet stated that any container less than or equal to 3 ml capacity is automatically also less than or equal to 100 ml capacity and label preparers cannot comply with both paragraphs (f)(12)(ii) and (f)(12)(iii); therefore, 
OSHA should modify paragraph 
(f)(12)(ii) to add a lower limit of ‘‘greater than 3 ml’’ (Document ID 0279, pp. 25– 26). OSHA does not believe that this change is appropriate because paragraphs (f)(12)(ii) and (f)(12)(iii) have separate conditions that trigger their applicability; thus, there is no conflict between the two provisions. Threet also requested that OSHA exclude situations where the immediate outer container might itself present a hazard, such as if it became contaminated with radiation (Document ID 0279, p. 26). In such a situation, the downstream user would have an obligation to ensure appropriate labeling under paragraph (f)(9); the agency does not believe it would be beneficial to complicate the regulatory text here. 
OSHA received one additional 
comment that was beyond the scope of proposed changes related to paragraph (f). PLASTICS submitted a comment relating specifically to (f)(6)(iii) that recommends using color-coded charts to replace labels at workstations where solvents present an issue with label integrity (Document ID 0357, pp. 3–4). This comment is out of scope because it does not relate to any changes proposed in the NPRM. OSHA notes that this issue has already been addressed in the 2015 HCS compliance directive (Document ID 0007). 
For the reasons discussed above, 
OSHA is finalizing paragraph (f)(12) of the rule as proposed. 
PLASTICS and Vinyl Institute also 
asked OSHA to address the difficulties associated with creating labels to meet the requirements of multiple 
jurisdictions with inconsistent requirements even though the manufacturer ‘‘does not know where the product will be shipped at the time it is packaged and labeled’’ (Document ID 0314, Att. 1, p. 20; 0369, Att. 2, p. 10). PLASTICS and Vinyl Institute did not provide any specific suggestions 
regarding how OSHA should address 
this issue. The HCS has always differed 
in some respects from other 
jurisdictions that adopt the GHS, and 
the GHS anticipates that countries will 
adopt the GHS with slight variation, so 
OSHA does not believe this is a new 
issue presented by the updates in this rulemaking. OSHA does not have 
control over the requirements of other jurisdictions, but notes that many of the changes in this final rule are designed to better align with other jurisdictions to avoid issues with inconsistent requirements. 
OSHA received two additional 
comments that are pertinent to paragraph (f), but that are out of scope for this rulemaking. PLASTICS requested that the agency codify the guidance in an LOI from November 23, 2015, that provides an exception for containers that are shipped to destinations outside of the U.S. and sent directly overseas with no anticipated exposures to downstream U.S. workers (Document ID 0314, Att. 1, p. 20). Vinyl Institute also identified this as a change that was missing from the proposals in the NPRM (Document ID 0369, Att. 2, p. 10). OSHA did not propose to codify this LOI in the NPRM, therefore this comment is outside the scope of this rulemaking and the agency declines to take the requested action. 
(g) Safety Data Sheets 
Paragraph (g) specifies the 
requirements for chemical 
manufacturers and importers to obtain or develop an SDS for each hazardous chemical in the workplace. SDSs provide important safety information to employers and employees on the use of hazardous chemicals in the workplace. Additionally, SDSs provide detailed technical information and serve as a reference for employees who are exposed to a hazardous chemical, industrial hygienists, safety professionals, emergency responders, health care professionals, and other interested parties. This final rule revises paragraphs (g)(2), which identifies what information must be included on an SDS, and (g)(10), which addresses the form and storage of SDSs, and corrects 
erroneous references to material safety data sheets in (g)(7). 
The first sentence of paragraph (g)(2) 
previously stated that the chemical manufacturer or importer preparing the SDS shall ensure that it is in English. However, as permitted by paragraph (g)(1), some chemical manufacturers and importers may obtain, rather than prepare, SDSs. To minimize any potential confusion between paragraphs (g)(1) and (2), OSHA proposed to revise paragraph (g)(2) by removing the reference to preparing the SDS. The sentence as proposed reads ‘‘The chemical manufacturer or importer shall ensure that the safety data sheet is in English ....  ’’. This is a technical 
clarification intended to ensure consistency with paragraph (g)(1). 
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OSHA also changed the wording in the 
parenthetical at the end of paragraph (g)(2) from ‘‘§ 1910.1200–Safety Data Sheets’’ to ‘‘to this section.’’ OSHA received no comments on these proposed revision to (g)(2); therefore, OSHA is finalizing (g)(2) as proposed. 
OSHA also proposed a change to 
paragraph (g)(10) to allow SDSs to be stored, rather than designed, in a way that covers groups of hazardous chemicals in a work area. When the HCS was first promulgated in 1983, paragraph (g)(10) permitted employers to design SDSs to cover groups of hazardous chemicals in a work area where it may have been more appropriate to address the hazards of a process rather than addressing the hazards of each chemical individually (48 FR 53337). 
In 2012, OSHA changed the SDS 
provisions of the HCS to require a standardized 16-section format, which improved hazard communication by ensuring users could quickly find relevant information (see 77 FR 17596– 98). The standardized format requires each SDS to address a single hazardous chemical rather than groups of hazardous chemicals. Therefore, OSHA has proposed a change to paragraph (g)(10) that would allow SDSs to be stored, rather than designed, in a way to cover groups of hazardous chemicals in a work area. As OSHA explained in the NPRM, the proposed change would allow employers flexibility in how they keep SDSs in the workplace while also ensuring that the required SDS format is maintained (86 FR 9700). The agency requested comments regarding whether the proposed revision would require stakeholders to make any significant changes to their current practices (86 FR 9688). 
Several commenters expressed 
support for this proposed revision. NAIMA supported the proposed revision, as SDSs must currently follow a standard format (Document ID 0338, p. 8). NACD similarly observed that the proposed revision ‘‘makes sense as the HCS requires SDSs to use a standard format’’ and further noted that it would not require any major changes to chemical distribution operations (Document ID 0329, p. 6). Ameren also noted that the proposed revision would not require significant changes to its current practices (Document ID 0309, p. 12). In addition, NIOSH stated that it is unaware of any changes to current practices that will be required by the proposed revision (Document ID 0281, p. 4; 0423, Tr. 19). OSHA received no comments or testimony objecting to the proposed revision to (g)(10). Several commenters requested 
clarification regarding the proposed 
change to paragraph (g)(10). API asked for ‘‘further clarification about the storing language’’ (Document ID 0316, p. 9). ACC asked if the revision would allow electronic storage of SDSs, or merely allow employers to group the SDSs together (Document ID 0347, p. 12). Dow also asked for clarification on electronic storage, stating that they ‘‘do not foresee an impact as long as OSHA can confirm that this change will still allow for on-site back-up storage of SDS’s while also allowing employers to provide electronic access to employees’’ (Document ID 0359, p. 4). 
In response to API’s request for 
clarification, OSHA notes that the general intent of the change to (g)(10), as discussed in the NPRM and reiterated above, is to allow the individual 16- section SDSs required by the 2012 HCS to be stored in a way that covers groups of hazardous chemicals in a work area (86 FR 9700). Because the HCS now requires an individual SDS for each chemical, however, employers can no longer ‘‘design’’ SDSs that cover groups of hazardous chemicals. Following publication of the final rule, OSHA will issue guidance materials and respond to inquiries on any aspects of the HCS for which stakeholders request information or clarification. 
In response to questions regarding 
electronic storage, OSHA notes that paragraph (g)(8) of the HCS, which requires the employer to maintain copies of the required SDSs for each hazardous chemical and make sure that they are readily accessible to employees 
when they are in their work areas, 
specifically permits electronic access to SDSs provided that such access poses no barriers to immediate employee access. OSHA elaborated on this in the preamble to the 2012 HCS (77 FR 17729). OSHA’s revision to (g)(10) does not change the requirements of (g)(8); the HCS still allows employers to provide SDSs via electronic access as long as employees have immediate access to the SDSs and employers are able to immediately provide copies of SDSs to medical personnel. 
For the reasons discussed above, 
OSHA is finalizing paragraph (g)(10) as proposed. 
Additionally, OSHA is also correcting 
references to material safety data sheets in (g)(7)(i), (iii), and (iv) which it identified after the NPRM. In this final rule, OSHA is updating those references to reflect the change to the terminology safety data sheets in the 2012 HCS. 
Finally, OSHA received one out-of- 
scope comment regarding paragraph (g)(4). TFI and ARA jointly commented that (g)(4) permits agricultural retailers 
to create a single SDS for all custom fertilizer blends of the same hazard classification, and asked OSHA to include a statement in the preamble adopting this interpretation (Document 
ID 0340, pp. 4–6). 
Paragraph (g)(4) allows chemical 
importers, manufacturers and retailers 
to prepare a single SDS where complex mixtures have similar hazards and contents (i.e., the chemical ingredients 
are essentially the same, but the specific composition varies from mixture to mixture). Where a single SDS is used for similar mixtures or in cases of batch-to- batch variability, concentration ranges of ingredients may be used. If the composition differences are small, and the hazard(s) remain the same, concentration ranges may be used for multiple, similar products; however, separate SDSs are required for blends containing distinct ingredients. TFI and ARA’s comment is beyond the scope of this rulemaking because OSHA did not propose any revisions to paragraph (g)(4). In addition, as TFI and ARA noted in their comment, OSHA has previously addressed this question in a letter of interpretation requested by TFI. As stated in that letter, OSHA cannot provide a blanket approval because the agency does not approve or endorse SDSs (available at https://www.osha.gov/laws-regs/standardinterpretations/2016-02-25.) 
(i) Trade Secrets 
Paragraph (i) of the HCS describes 
certain conditions under which a 
chemical manufacturer, importer, or employer may withhold the specific chemical identity (e.g., chemical name), 
other specific identification of a hazardous chemical, or the exact percentage (concentration) of the substance in a mixture, from the SDS. 
In the NPRM, OSHA proposed several 
changes to paragraph (i). First, OSHA 
proposed to allow manufacturers, importers, and employers to withhold a chemical’s concentration range as a trade secret, which had not previously been permitted, and to add language specifying that it is Section 3 of the SDS from which trade secret information may be withheld. Second, OSHA proposed to require the use of prescriptive concentration ranges in lieu of the actual concentration or concentration range whenever the actual concentration or concentration range is claimed as a trade secret. These changes were proposed to align with Canada’s WHMIS, allowing manufacturers, importers, and employers the ability to use the same SDS for both U.S. and Canadian workplaces. The proposed 
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ranges are the same as those required by 
Canada (Document ID 0172). Third, OSHA proposed to replace the phrase ‘‘physician and nurse’’ in paragraph (i) with the term Physician or other licensed health care professional (PLHCP), defined as an individual 
whose legally permitted scope of practice (i.e., license, registration, or certification) allows the individual to independently provide or be delegated the responsibility to provide some or all of the health care services referenced in paragraph (i) of the standard. 
OSHA requested comments on the 
proposed changes to paragraph (i), including information on stakeholders’ experiences with developing SDSs using the prescribed concentration ranges for compliance with Canada’s WHMIS and any concerns they might have about using concentration ranges on the SDS. OSHA also requested comments on whether the proposed ranges would provide sufficient information for downstream manufacturers to conduct hazard classifications and whether the proposed ranges would be too wide to provide sufficient information to protect workers. 
Additionally, OSHA requested 
comments specific to proposed new paragraph (i)(1)(v), which would require use of the narrowest applicable concentration range, but in cases where the concentration range to be withheld falls between 0.1 percent and 30 percent and does not fit entirely into one of the prescribed concentration ranges, would permit use of a single range created by the combination of two applicable consecutive ranges instead, provided that the combined concentration range does not include any range that falls entirely outside the actual concentration range in which the ingredient is present. OSHA requested comments on this proposal and on two alternatives to the proposed provision: a more lenient version, allowing combinations among all ranges up to 100 percent concentration, and a more restrictive version, such as allowing combinations only for the ranges up to 10 percent concentration. 
Several commenters expressed 
general support for OSHA’s proposal to allow actual concentration ranges to be withheld as a trade secret and to require the use of prescribed concentration 
ranges (Document ID 0316, p. 28; 0323, p. 9; 0329, p. 6; 0359, p. 4; 0361, pp. 2– 3; 0363, pp. 6–7; 0368, p. 12; 0425, Tr. 75–78). IMA–NA supported the trade secret protections in the NPRM, stating that the proposed revisions would provide necessary flexibility in the use of concentration ranges for mixtures omitted from SDS disclosures and protect sensitive information (Document 
ID 0363, pp. 6–7). NACD commented that the prescription of ranges would improve accuracy of companies’ hazard assessments and reporting by introducing a standardized set of ranges and reducing ‘‘guesswork’’ in the selection of an appropriate range and would ease compliance with OSHA’s 
PSM standard and the EPA’s Risk 
Management Program, (Document ID 0329, p. 6; 0423, Tr. 178–179). Dow also supported the use of prescribed ranges to protect trade secrets, stating that OSHA’s proposal ‘‘strikes a fair balance between disclosure of information and worker protection’’ (Document ID 0359, p. 4). NABTU strongly supported the proposed requirement of mandatory concentration ranges (Document ID 0334, p. 4; 0425, Tr. 24–25). 
Several commenters, including 
industrial entities or associations such as Hach, NACD, Dow, and ACA, additionally supported the specific ranges OSHA proposed, which align with those already in use by Health Canada (Document ID 0323, p. 9; 0329, p. 8; 0359, p. 4; 0368, p. 12). ACA noted that some ACA members already use the ranges prescribed by Canada and have found that the ranges provide adequate information to downstream users (Document ID 0368, p. 12). 
OSHA also received comments 
critical of its proposal. Some stakeholders argued that the proposed requirement would weaken protections for CBI relative to the provisions of the 2012 HCS. Among these, most suggested that OSHA should make the use of prescribed concentration ranges optional for entities claiming the actual concentration range as a trade secret (Document ID 0319, p. 2; 0321, pp. 2– 3; 0327, p. 6; 0343, p. 3; 0356, p. 4; 0343, p. 3; 0347, pp. 13–14; 0366, p. 6; 0367, p. 3; 0369, p. 9; 0374, p. 2; 0424, Tr. 13; 0447, pp. 4–5), while FCA favored maintaining the existing trade secret provisions (Document ID 0345, p. 4). Several stated that the specific ranges OSHA proposed would be too narrow to adequately protect CBI (Document ID 0324, p. 4; 0345, p. 4; 0366, p. 6; 0367, p. 3; 0369, p. 9; 0468, pp. 3–4), or could be confusing because some of the ranges overlap one another (Document ID 0345, p. 4) or cross some hazard classification 
thresholds (Document ID 0347, p. 14; 0349, pp. 1–2; 0366, p. 6). Michele Sullivan commented that ranges which cross hazard classification thresholds 
‘‘could also cause a conflict with the EU 
CLP requirements’’ (Document ID 0366, 
p. 6). 
A few commenters stated that 
requiring the use of prescribed ranges would be expensive and time- consuming for companies who would need to program changes to their SDSs for use in the U.S. if claiming actual concentration range as a trade secret (Document ID 0343, p. 3; 0347, pp. 13– 14); NAIMA, on the other hand, commented that it ‘‘is not aware of any economic implications associated with including the prescribed concentration ranges so long as they are not so narrow as to effectively annul the Trade Secret’’ (Document ID 0338, p. 8). Others argued that workers are adequately protected under the standard’s existing provision allowing medical professionals to obtain chemical composition from the chemical manufacturer, importer, or employer in an emergency, in addition to the standard’s existing provisions for OSHA and certain others to obtain it in some non-emergency situations (Document ID 0366, p. 6; 0356, p. 4; 0337, p. 2; 0349, pp. 1–2). APA commented that the previously existing HCS provisions for trade secrets and medical personnel access to information are appropriate because errors in judgment may occur if emergency responders opt to rely on information from a prescribed range instead of contacting the manufacturer to get an exact percentage (Document ID 0337, p. 2). 
While most commenters who 
expressed concern about protection of CBI or the potential costs of compliance did not give further information, examples, or analysis to support their position, a few provided additional explanation. ILMA noted that, because their products are often customized, a requirement to provide concentration range information could compromise CBI for their customers as well as themselves, and that legal protections of CBI may be lost once a trade secret is revealed through non-illicit means (Document ID 0356 p. 4; 0424, Tr. 120– 121). ACC stated that the concentration of a substance within a mixture could possibly be determined ‘‘for example, if the classification limit is close to one of the concentration cutoffs’’ (Document ID 0347, p. 14). In their post-hearing comments, ACC provided a hypothetical example: ‘‘If there are 2–3 components in a solution one at 95% and two at 2 and 3%, the 1 to 5% range could just be a few competitor tests away from getting it right. . . [A] wide range protects more’’ (Document ID 0468, pp. 7–8). NAIMA’s post-hearing comment stated that ‘‘For mixtures, any [range] less than 10 percent would be too narrow.’’ NAIMA also stated that the following ranges ‘‘have been identified as . . . sufficient to protect trade secrets: (a) 7 to 13%; (b) 10 to 30%; (c) 15 to 
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57Health Canada published the update to their 
HPR in December 2022. Their final rule includes 
the allowance for narrower ranges. Canada Gazette, Part II, Volume 157, Number 1. 40%; (d) 30 to 60%; (e) 45 to 70%; (f) 
60 to 80%; (g) 65 to 85%; (h) 80 to 100%; and 0–10%’’ (Document ID 0461, p. 1). 
Some commenters suggested that 
companies should be allowed to design ranges appropriate to their CBI or other business needs (Document ID 0319, p. 2; 0324, p. 4; 0345, p. 4; 0363, p. 6; 0366, p. 6; 0425, Tr. 24–25). For example, ICT commented that OSHA should permit mixture manufacturers/importers to prepare SDSs with concentration ranges that sufficiently protect their trade secrets (Document ID 0324, p. 4) and FCA requested that manufacturers be allowed to utilize ranges customary within their industry (Document ID 0345, p. 4). In addition, several commenters suggested that OSHA should allow companies to select ranges narrower than those OSHA proposed (Document ID 0299, pp. 2–3; 0309, pp. 13–16; 0321, p. 2; 0334, pp. 3–4; 0349, p. 1; 0359, p. 4; 0368, p. 12; 0425, Tr. 24–25, 35–36, 117–118; 0464, p. 6). Dow noted that Health Canada’s latest proposed revision to their HPR codifies a similar allowance for smaller ranges that fit within the prescribed ranges, so that adoption of a similar provision by OSHA would maintain alignment with Canada (Document ID 0359, p. 4).
57 
Industrial Health and Safety Consultants (IHSC) suggested that the issue of over- classification (i.e., cases in which use of 
a prescribed range could result in classifying a substance in an additional and/or higher hazard category) could be alleviated by allowing the use of concentration ranges narrower than those proposed (Document ID 0349, pp. 1–2). PLASTICS asked whether a classifier would be required to classify a product to reflect the most severe category into which the highest point of a range selected to represent batch variability would fall (Document ID 0314, p. 21). 
NABTU supported permitting 
manufacturers and importers to use their own concentration ranges if they are narrower than the prescribed ranges (Document ID 0425, Tr. 24–25; see also Document ID 0334, p. 4; 0424, Tr. 35– 36, 0464, p. 6). 
NIOSH testified at the public hearing 
that ‘‘non-mandatory use of the 
prescribed concentration ranges . . . 
could weaken protection of workers by 
downplaying the contribution of the 
chemical in question to the hazards of 
the product’’ (Document ID 0423, Tr. 20) 
and that the prescribed concentration ranges ‘‘will allow handlers of the 
materials better protections and better hazard communication, as well as emergency responders potentially dealing with a substance and having to access that information readily’’ (Document ID 0423, Tr. 31–32). NIOSH also commented that allowing manufacturers to use their own concentration ranges could result in ranges so broad as to be nearly useless, providing the example of an SDS that listed a concentration range from one- half of one percent to 50 percent (Document ID 0281, p. 6; 0423, Tr. 30– 31, 47–48). NABTU echoed this concern, stating in post-hearing comments, ‘‘[t]he wide concentration ranges manufacturers are currently listing on their SDSs make it more difficult to determine if the use of a given product is likely to result in exposures above or below levels considered to be safe’’ (Document ID 0464, p. 6). 
After considering all comments 
received on the agency’s proposed requirement to use prescribed ranges which align with those in use by Health Canada, OSHA has decided to finalize the requirement to utilize prescribed concentration ranges when claiming exact concentration as proposed, with the exception that OSHA is adding a new paragraph (i)(1)(vi). This new provision allows the use of narrower ranges than those prescribed in (i)(1)(iv) and (i)(1)(v), meaning that the range must be fully within the bounds of a prescribed range listed in (i)(1)(iv) or fully within the bounds of a combination of ranges allowed by (i)(1)(v). OSHA’s responses to the concerns received regarding proposed paragraph (i) are given below. 
First, OSHA is not persuaded that 
requiring the use of prescribed ranges, or the specific ranges the agency proposed, would significantly compromise CBI. The trade secret provisions of the HCS do not rely only on withholding of concentration information in order to protect CBI, but also allow the manufacturer or supplier to claim the chemical identity as CBI (paragraph (i)(1)). In addition, OSHA does not require listing the chemical’s generic chemical identity or alternative name (e.g., ‘‘Alcohol’’ for propanol vs. 
‘‘Component 1’’), which provides additional CBI protection. And, while several commenters opined that required use of the ranges OSHA proposed could compromise CBI, none provided persuasive information, argument, or analysis to support their concerns or preferred alternative. While 
NAIMA provided alternate ranges for OSHA’s consideration in post-hearing comments, which they said, ‘‘have been 
identified as . . . sufficient to protect trade secrets,’’ this statement is not supported by the source NAIMA cites. That source is a document summarizing the thirteen prescribed concentration ranges included in Canada’s 2015 update to the HPR for use in protecting trade secrets. These ranges include the ranges (a) 0.1 to 1 percent; (b) 0.5 to 1.5 percent; and (c) 1 to 5 percent, which are not included in the set of ranges NAIMA gave when citing the summary document. They do not include the range 0–10 percent, which was included in NAIMA’s post-hearing comment citing the document. NAIMA’s statement that the ranges it listed ‘‘have been identified’’ as protective of CBI therefore does not accurately reflect the content of the source it cited; rather, that source refers to the prescribed ranges that Canada adopted and that OSHA proposed in the NPRM (Document ID 0461, p. 2). 
Furthermore, OSHA’s proposed 
ranges have been in use by entities trading in Canada since 1988 (previously under WHMIS 1988 and then reinstated under the HPR in 2018), yet no commenter provided a real-world example of CBI compromised due to the use of Canada’s prescribed ranges. Notably, ACA stated that some of its members already use the ranges prescribed by Canada and have found they provide adequate information to downstream users (Document ID 0368, p. 12); ACA did not report that using the prescribed ranges compromised any of their members’ trade secrets. NACD commented that individuals involved in the commercial and sales aspects of chemical distribution ‘‘reported no concerns that the prescribed ranges would inadvertently disclose trade secret information’’ (Document ID 0329, p. 6; 0423, Tr. 178–179). API stated it had no concerns with the proposed change (Document ID 0316, pp. 10, 28). And, as previously noted, OSHA received comments from several industrial entities or associations including Hach, NACD, Dow, and ACA, specifically supporting the requirement to use the ranges used by Health Canada (Document ID 0323, p. 9; 0329, p. 8; 0359, p. 4; 0368, p. 12). 
After consideration of the comments 
received on possible compromise of CBI, OSHA finds that these commenters have not adequately supported their position that the proposed requirement to use prescribed concentration ranges would significantly compromise CBI. OSHA is also not persuaded that paragraph (i) should include broader 
ranges than those proposed or allow companies flexibility to design ranges 
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broader than those proposed. Creating 
broader ranges would be less informative to workers and other downstream users, and would negate the benefit of consistency with Canada’s system. However, OSHA notes in response to PLASTICS that classifiers would be required to classify a substance according to the most severe hazard associated with the range they select, and agrees with comments that allowing the use of narrower concentration ranges than those prescribed would alleviate some of the classification concerns raised by stakeholders without compromising the information provided to workers and other users. Therefore, OSHA is adding a new paragraph (i)(1)(vi) which states that the SDS preparer may provide a range narrower than those prescribed in (i)(1)(iv) or (i)(1)(v). This means that the range selected must be fully contained within the range or combination of ranges required under (i)(1)(iv) and (i)(1)(v), inclusive of the boundaries of such ranges. For example, when the ingredient’s concentration range in the mixture is 0.9 to 2 percent and that range is claimed as CBI, paragraph (i) as proposed would have required the manufacturer or supplier to give the range 0.5 to 5 percent (a combination of the prescribed ranges 0.5 to 1.5 percent and 1 to 5 percent). The revision to the proposed text allows the manufacturer or supplier to disclose a narrower range such as 0.5 to 2 percent, or 0.9 to 5 percent, or 0.5 to 2.5 percent. If a manufacturer or supplier finds that the concentration range they intend to claim as a trade secret is below a certain hazard classification/category threshold but using a prescribed range (or allowable combination of prescribed ranges) would trigger other requirements (e.g., shipping, storage) 
which would not have been triggered by the actual concentration range, they may use a narrower range or combination of ranges to avoid this issue. The allowance for the use of narrower concentration ranges that fall within the prescribed ranges aligns with Canada’s WHMIS (Document ID 0172). 
OSHA also disagrees with 
commenters who stated that requiring the use of prescribed concentration ranges would provide no benefit to workers beyond the existing provisions pertaining to medical emergency situations, which allow medical professionals to obtain chemical composition from the chemical manufacturer, importer, or employer in the event of a medical emergency. OSHA has determined that providing ready access to information about the concentration range of hazardous 
substances to workers and other users is also essential to the purposes of the HCS when such ranges are claimed as trade secrets. Workers have a right to know, and to be able to readily access, information about the nature and extent of their occupational exposures to hazardous substances for their own information, records, and use—for example, in the event that health concerns arise that may be work-related. 
In addition, OSHA believes that emergency responders will benefit from 
ready access to the prescribed concentration range of a hazardous substance, particularly in cases where it may not be possible to achieve immediate contact with the producer. Furthermore, the use of prescribed ranges will help employers and other users to appropriately assess risk in the workplace, even before an emergency arises. This requirement provides information to help manage risk proactively. 
Some commenters objected that 
OSHA’s proposed changes to paragraph (i) would not sufficiently inform workers regarding hazardous materials in the workplace (Document ID 0268; 0299, pp. 2–3; 0341, pp. 38–39; 0354, p. 1, 0354, p. 6, 0356, p. 6). National COSH and Worksafe jointly commented that the proposal would increase uncertainty for workers as well as for regulators, employers, worker representatives and other decision-makers (Document ID 0354). In contrast, NABTU found the proposed approach to be an acceptable alternative to the current standard as the prescribed concentration ranges ‘‘would at least provide some information [about] concentration in every instance of the trade secret claim’’ (Document ID 0425, Tr. 24–25). NIOSH stated that the proposed change would not increase risk to workers provided that the trade secret exemption is applied only in limited and specific situations, and that complete information on hazardous properties, special handling requirements, and necessary PPE is provided on the SDS (Document ID 0281, p. 4; 0423, Tr. 19–20). 
OSHA disagrees with comments that 
the proposed revisions to paragraph (i) 
would lessen protections and/or 
information for workers. Under 
paragraph (i), there are three types of 
information that manufacturers can 
claim as a trade secret: the name of a chemical, the exact percentage of a chemical’s concentration in a mixture, 
and/or a concentration range. In the 
2012 HCS, OSHA allowed 
manufacturers to completely withhold 
the name and/or the exact percentage; manufacturers who withheld a chemical’s exact percentage were not 
required to list a concentration range in its place. Under this final rule, manufacturers may no longer completely withhold the exact percentage; they must now provide a concentration range in its place. This change will result in additional information available to workers. 
The Work Health and Survival Project 
(WHSP) and an anonymous commenter suggested that OSHA should adopt the trade secret policies of Australia’s Work Health and Safety (WHS) regulation, in which the identities of chemicals presenting moderate hazards may be withheld as trade secrets on the SDS and disclosed using a generic name (Document ID 0341, pp. 38–39; 0268). A different anonymous commenter, who claimed to have experience with companies that make insufficiently supported trade secret claims as a pretext for withholding the identity or percentage of hazardous ingredients, opined that OSHA’s proposal to allow the concentration range to be withheld as a trade secret would make it more difficult for downstream users to conduct hazard classifications, and that ‘‘the inappropriate claiming of trade secret status should be addressed before companies are allowed to also claim the range as a trade secret’’ (Document ID 0308, p. 1). They suggested that the HCS should not allow ‘‘chemical ingredients of public knowledge or of general knowledge in an industry’’ to be claimed as a trade secret. 
OSHA did not propose to require the 
use of a generic name when the identity of chemicals presenting moderate hazards are withheld as trade secrets or to disallow trade secret protection for generally known chemical components. These suggestions are therefore out of scope for this rulemaking. For OSHA to consider these changes they would need to be addressed in a future rulemaking. Furthermore, OSHA does not agree that the proposal to allow concentration ranges to be withheld as a trade secret must not be finalized until the possibility that some manufacturers may be using the trade secret provisions inappropriately is eliminated. OSHA believes that potential misuse of trade secret protections is best addressed through enforcement. 
Several commenters gave input on the 
proposed rules for combining ranges, 
including responses to the question OSHA posed in the NPRM as to whether it should allow more expansive combination of the prescribed ranges. NAIMA and Ameren supported combination of all ranges listed (Document ID 0309, p. 13; 0338, p. 8; 0423, Tr. 162–163). Ameren cited 
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‘‘potential cost savings by OSHA 
allowing combinations among all ranges’’ (Document ID 0309, p. 13). 
DOD opposed allowance for 
combinations of all prescribed ranges, arguing that the benefits to be gained by requiring use of prescribed ranges would be negated by allowing combination of an unlimited number of concentration ranges. DOD recommended instead that OSHA should ‘‘allow no more than 2 prescribed concentration ranges, below 20%, to be combined as this would still provide actionable information for managers and safety professionals to protect worker health’’ and that the use of any concentration range greater than 20% (or combined concentration ranges greater than 20%) should require some form of special exemption (Document ID 0299, pp. 2–3). 
OSHA agrees with DOD that allowing 
employers to combine prescribed ranges from (i)(1)(iv)(A) through (M) would prevent important information from reaching employees and health and safety professionals. However, OSHA does not agree that limiting concentration ranges to no greater than 20% will materially improve the effectiveness of the standard over the concentration ranges OSHA proposed. Most of the concentration ranges OSHA proposed to adopt in paragraph (i)(1)(iv) are 25% or less, with the exception of paragraph (i)(1)(iv)(I) (concentrations between 30% and 60%). The largest range that could be created through combining ranges is 23% (for concentrations of 7% to 30%). As explained above, the ranges chosen have been in use by entities trading in Canada since 1988 and OSHA finds no evidence in the record, or in DOD’s comment, demonstrating that these ranges are insufficient to effectively inform workers and downstream users of chemical hazards. In addition, altering the concentration ranges would negate the benefit of consistency with Canada’s system. Therefore, OSHA is not adopting DOD’s suggestion. 
PLASTICS asked OSHA to clarify 
what is required if the actual concentration range straddles two prescribed ranges, in two situations. First, PLASTICS stated that the proposal ‘‘does not clearly convey the options available if the exact range falls between 
0.1% and 30% and does not fit entirely into one of the prescribed ranges.’’ Second, PLASTICS asked for clarification on what should be done if the actual concentration range straddles two prescribed ranges and it exceeds 30%. PLASTICS proposed the following revision to address these situations: ‘‘[w]hen the concentration or concentration range for an ingredient is withheld as a trade secret, the SDS must list the narrowest prescribed concentration range(s) in § 1910.1200(i)(1)(iv) which include(s) the actual concentration or concentration range for that ingredient’’ (Document ID 0314, p. 21; see also 0423, Tr. 142–143). 
OSHA disagrees with PLASTICS’ 
suggestion. First, OSHA believes proposed paragraph (i)(1)(v) does clearly specify what a manufacturer must do when the exact range falls between 0.1 and 30 percent but does not fit entirely into one of the prescribed ranges (A) through (G). In that case, the manufacturer must combine two consecutive ranges between (A) and (G) and may supply the resulting range in place of selecting a single prescribed range to represent the concentration range on the SDS. 
Regarding PLASTICS’ question as to 
what should be done when a concentration range above 30 percent cannot be captured by the use of a single prescribed range, OSHA believes in such a circumstance it would be inappropriate for a manufacturer to withhold the concentration range from the SDS. In the hypothetical case where representing a manufacturer’s batch would require a combination of ranges above 30 percent, the resulting range would generally be too wide to provide meaningful information to workers, and permitting such combinations would bring the HCS out of alignment with Canada. Therefore, OSHA is not adopting PLASTICS’ proposed revision. OSHA notes that manufacturers would still, in such cases, have the option of withholding the chemical identity in order to protect trade secret information. 
ADM similarly suggested that OSHA 
revise paragraph (i) ‘‘to clarify that any of the prescriptive concentration ranges be allowed, if accurate’’ (Document ID 0361, p. 3). OSHA notes that ADM’s requested change would contradict, rather than clarify, the agency’s intent. Manufacturers must use the narrowest range possible that includes the true 
concentration range, so that workers 
will have access to the most precise 
information possible under a system of 
prescribed ranges which align with 
Health Canada’s requirements. 
For the reasons discussed above, 
OSHA is finalizing the rules for 
combination of prescribed ranges as 
proposed, with the exception that 
OSHA has added paragraph (i)(1)(vi) to allow use of narrower ranges, and narrower combinations of ranges, than those described in (i)(1)(iv) and (i)(1)(v) respectively. PLASTICS also suggested revising 
(i)(1) to state that the chemical 
manufacturer, importer, or employer may withhold the chemical identity and/or concentration or concentration range of a hazardous chemical ‘‘substance . . . from Section 3 ( as well 
as every other section) of the safety data sheet . . .’’ (emphasis added to indicate PLASTICS’ suggested additions to (i)(1)) (Document ID 0314, p. 20). PLASTICS opined that the reference to Section 3 in paragraph (i)(1) ‘‘could imply that it must still be included elsewhere’’ on the SDS. 
OSHA does not believe that 
PLASTICS’ suggested text is necessary or appropriate. OSHA intended the instructions contained in paragraph (i)(1) to pertain to how to treat chemical trade secrets for Section 3 of the SDS. This is evident in OSHA’s HCS Compliance Directive, which specifies that if a trade secret is claimed, the SDS must indicate that the identity and/or concentration of the chemical is claimed as a trade secret in Section 3 (Document ID 0007, pp. 76–77). OSHA proposed to add ‘‘in Section 3’’ to paragraph (i)(1) to ensure that its intent for the directions contained in paragraph (i)(1) to apply specifically to the SDS Section 3 is clear. However, OSHA did not intend for this clarification to imply that a manufacturer who withholds the identity of a hazardous chemical from Section 3 in accordance with paragraph (i) must provide the name of that chemical in other sections, such as in conjunction with its OSHA Permissible Exposure Limit (PEL) or American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) (if applicable) in Section 8. Rather, the identifier provided for that chemical in Section 3 should be used consistently throughout the SDS. This is also conveyed by the directive, which indicates that the identifier used in Section 3 and Section 8 must be the same if there is a PEL or TLV associated with the constituent. In addition to the requirement to use a single identifier for a hazardous chemical throughout the SDS, OSHA notes that in other sections where a manufacturer may make specific claims about a chemical constituent’s health effects and provides supporting evidence for those claims (e.g., Section 11, Toxicological 
information) the manufacturer must provide sufficient information regarding the chemical identity for others to assess these claims. 
Furthermore, OSHA notes that 
PLASTICS does not explain the addition of ‘‘substance’’ in its suggested text. The 
agency finds that adding ‘‘substance’’ in the place indicated does not improve on 
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the original text and is not making this 
change to the regulatory text. 
Toby Threet was concerned that if a 
range is broader than OSHA’s specified ‘‘ ‘trade secret’ ranges, but . . . not being withheld as a trade secret . . . an Agency inspector [may] misunderstand and issue a citation, believing that these broad ranges did not comply with paragraphs (i)(1)(iv) and (i)(1)(v).’’ Threet requested ‘‘clarification from OSHA that the provisions of paragraphs (i)(1)(iv) and (i)(1)(v) apply only to concentration ranges that are withheld as a trade secret, not to actual concentration ranges that are disclosed in the SDS. Thus, if the actual concentration range is broader than the ranges stated in paragraph (i), and is disclosed, this does not constitute noncompliance with paragraph (i)’’ (Document ID 0279, p. 7). OSHA does not believe this to be an issue because paragraphs (i)(1)(iv)–(v) unambiguously apply only to trade secret claims and paragraph (i)(1)(iii) requires the SDS to indicate when the specific chemical identity and/or percentage concentration or concentration range of composition is being withheld as a trade secret. Moreover, OSHA expects that its inspectors will be adequately trained in the proper application of the standard’s requirements. Therefore, OSHA does not believe there will be any confusion on this point and is not adopting Threet’s suggestion. 
As explained in the Summary and 
Explanation for paragraph (c), OSHA proposed in the NPRM to add a definition of Physician or other licensed health care professional (PLHCP) to the 
standard, defined as an individual whose legally permitted scope of practice (i.e., license, registration, or 
certification) allows the individual to independently provide or be delegated the responsibility to provide some or all of the health care services referenced in paragraph (i) of the standard. Correspondingly, OSHA proposed to replace the phrase ‘‘physician and nurse’’ in paragraph (i) with ‘‘PLHCP’’ to be consistent with other OSHA standards that use the term PLHCP and to better reflect current medical practices. No commenter objected to this revision. 
In their comments and at the public 
hearing, PLASTICS requested guidance 
on what measures an employer may take prior to disclosing a trade secret in the event of a medical emergency to verify it would be disclosed to an appropriate individual (Document ID 0314, p. 21; 0423, Tr. 142–143). Paragraph (i)(2) specifies that where a treating PLHCP determines that a medical emergency exists and the chemical identity and/or specific percentage concentration of a 
hazardous chemical is needed for emergency or first-aid treatment, the chemical manufacturer, importer, or employer must immediately disclose the specific chemical identity or percentage composition of a trade secret chemical to that treating PLHCP, regardless of whether a written statement of need or 
a confidentiality agreement exists. 
However, the chemical manufacturer, importer, or employer may require a written statement of need and confidentiality agreement, in accordance with the provisions of paragraphs (i)(3) and (4), as soon as circumstances allow. The confidentiality agreement authorized by paragraph (i)(3)(iv) provides remedies to ensure CBI is protected. 
Finally, PLASTICS and Michele 
Sullivan expressed concern that the use of ‘‘or’’ in paragraph (i)(1) could suggest that either the identity or the concentration of an ingredient may be withheld as CBI, but not both. (Document ID 0314, pp. 20–21; 0366, p. 5). OSHA’s intent is that both chemical identity and the exact percentage (or the concentration range) may be claimed as a trade secret. To clarify this, and to be consistent with similar language in paragraph (i)(1)(iii), OSHA has revised paragraph (i)(1) in the final rule to state that the manufacturer, importer, or employer may withhold the specific chemical identity and/or the exact percentage (concentration) or concentration range of the chemical for which a trade secret is claimed. 
(j) Dates 
Paragraph (j) of the HCS specifies the 
dates by which compliance with the 
updated provisions of the HCS is required. This final rule modifies the previous dates in paragraph (j), which pertained to implementation of the 2012 update to the HCS and have all passed. 
As explained below, OSHA has modified the compliance dates in the final rule from those proposed in the NPRM to address stakeholders’ concerns that the proposed dates did not provide sufficient time for chemical manufacturers, importers, and distributors to comply. 
In the NPRM, OSHA proposed a two- 
year tiered compliance period. First, OSHA proposed that the final rule would become effective 60 days after the publication date (paragraph (j)(1)). The agency then proposed two staggered compliance dates: chemical manufacturers, importers, and distributors evaluating substances would be required to comply with all modified provisions of the HCS no later than one year after the effective date (paragraph (j)(2)) and chemical 
manufacturers, importers, and distributors evaluating mixtures would need to comply no later than two years after the effective date (paragraph (j)(3)) (86 FR 9701). 
OSHA received numerous comments 
on the proposed dates in paragraph (j), including requests for extension of compliance dates; comments related to the proposed differentiation between compliance dates for substances and mixtures; and requests for clarification. 
Two commenters stated that they 
believed the proposed compliance dates were adequate (Document IDs 0309, p. 17; 0360, p. 9). Many commenters, however, requested more time to comply with the proposed changes to the HCS. Suggestions included extension of compliance dates ranging from an additional six months to two years for substances and six months to three years for mixtures (see, e.g., 
Document ID 0347, pp. 14–16; 0423, Tr. 106; 0327, pp. 2–3; 0329, pp. 9–10; 0343, p. 4; 0349, pp. 2–3; 0338, pp. 5; 0461, pp. 3–5; 0368, p. 10; 0323, p. 10; 0367, p. 6; 0447, p. 6; 0291, pp. 2–4; 0356, p. 11; 0339, p. 4; 0316, p. 11; 0364, p. 3; 0283, p. 6). Commenters based these recommendations on a number of considerations related to the difficulty of updating labels and SDSs. For example, ACC stated that a significant number of the proposed changes to the HCS would either require updating a large number of SDSs, such as the requirement to list particle characteristics, or would require extensive time to implement properly due to the need to purchase new software, test and approve changes to software, and update precautionary statements on SDSs (Document ID 0347, pp. 15–17). NAIMA noted additional reasons that updating labels and SDSs would be time-consuming, including the time required to replace language or change color on a product label; review the changes for quality, accuracy, and compliance with all regulatory requirements; and redesign the labels (Document ID 0338, pp. 4–5; 0461, pp. 3–5). 
Several commenters expressed 
support for OSHA’s proposed tiered approach which provided a later compliance date for chemical manufacturers, importers, and 
distributors responsible for evaluating mixtures than for those evaluating substances (See, e.g., Document ID 0323, 
p. 10; 0327, p. 2; 0356, p. 10; 0366, p. 6; 0367, p. 6; 0447, p. 6; 0347, p. 14; 0287, p. 12; 0309, p. 17; 0316, p. 11). However, some commenters expressed concern that the compliance windows were too short because downstream 
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users might not receive key information 
from upstream manufacturers, importers, or distributors in time to comply with the requirement to update SDSs or labels (See, e.g., Document ID 
0327, pp. 2–3; 0329, p. 10; 0356, p. 10; 0317, p. 2; 0314, pp. 22–23; 0338, pp. 3–5; 0323, p. 10; 0287, p. 11; 0362, pp. 4–5). The National Association of Manufacturers (NAM) noted that many downstream manufacturers, importers, or distributors may not know whether there are any updates in classification coming from upstream (Document ID 0362, pp. 4–5). Hach echoed this concern, stating that this issue had previously caused problems with OSHA’s 2012 update to the HCS (Document ID 0323, p. 10). Hach suggested that OSHA extend the compliance deadline for chemical 
manufacturers of mixtures to two years 
beyond the compliance date for substances (Document ID 0323, p. 10). 
For similar reasons, some commenters 
recommended adding an additional tier for chemical manufacturers who combine multiple mixtures since they will be reliant on upstream manufacturers, importers, or distributors for new information, which may come at the end of the compliance period for the mixture tier (Document ID 0317, p. 2; 0362, pp. 4–5; 0326, p. 8). NAM and NRI recommended that in this potential third tier OSHA should explicitly state that such companies are allowed three months to update SDSs and six months to update labels from the date the companies receive new information from upstream suppliers (Document ID 0362, p. 5; 0326, p. 8). NACD proposed a slightly different change to the tiered compliance dates and requested that OSHA adopt a staggered implementation timeline based on role in the supply chain, where the original chemical producer would have 18 months to comply, and the next segment of the supply chain (typically chemical distributors) would have an additional year (Document ID 0329, pp. 9–10). 
As the following discussion explains, 
OSHA believes that the proposed compliance dates will be adequate for implementation of most of the HCS revisions included in this final rule. However, OSHA is adopting a modest 
extension to the proposed compliance dates to account for the possibility that some of the issues cited by stakeholders could present a significant challenge to meeting the proposed timeline. 
As discussed further in Section VI., 
Final Economic Analysis and Regulatory Flexibility Analysis, OSHA has analyzed the time, effort, and cost of the changes in this rule and has concluded that most of the revisions will require only limited changes to SDSs and labels for select hazardous chemicals to reflect chemical reclassifications (Appendix B) and to conform to language criteria in precautionary statements and other mandatory language (Appendix C and Appendix D). As also noted in that 
section, chemical manufacturers and 
importers periodically review, revise, and update the electronic templates they use to create SDSs and labels when new information becomes available, changes are made to the product, or new products are introduced to the market, allowing many chemical manufacturers and importers to phase in any required revisions to their labels and SDSs in accordance with the normal cycle of updating these items. The arguments raised by commenters were accounted for in that analysis. Therefore, the agency estimates that the revisions it is finalizing will, for the most part, be possible to work into the normal cycle of SDS and label updates. 
Although OSHA believes that the 
proposed one- to two-year tiered compliance dates will accommodate implementation of most revisions included in this final rule, the agency also recognizes that some of the changes to the HCS in this update will result in major changes to classifications, and that some of the changes to Appendix C and Appendix D may result in significant changes to some labels or SDSs, which could pose difficulties for some stakeholders to meet the compliance dates originally proposed. Therefore, OSHA is extending the compliance date for chemical manufacturers, importers, and distributors evaluating substances to be 18 months after the publication date and the compliance date for mixtures to be 36 months after the publication date. OSHA is amending the designation of the compliance date for substances to be paragraph (j)(2)(i) and is amending the designation of the compliance date for mixtures to be paragraph (j)(3)(i) in order to accommodate the addition of paragraphs (j)(2)(ii) and (j)(3)(ii), discussed later in this section. OSHA is not further differentiating the compliance timeline between manufacturers of mixtures from substances and manufacturers of mixtures from mixtures, as some 
commenters suggested. Nor is OSHA 
adopting a staggered implementation 
timeline based on role in the supply chain, as NACD suggested. OSHA is concerned that adding such additional 
tiers could potentially create a very long 
compliance timeline, leaving workers along the supply chain with uneven 
protections and undermining the purpose of the HCS, which is to have a single harmonized system. As the agency explained in finalizing the 2012 HCS, although some overlap between the current requirements and the new ones is inevitable during the phase-in period, ‘‘hazard communication during this transition period will be confusing and less effective’’ (77 FR 17739). OSHA seeks to limit this effect by ensuring that the transition is completed in a timely fashion. 
OSHA has determined that the 
changes in this final rule can be implemented within the timeframes set for compliance. OSHA believes that the extended dates and tiered approach based on substances and mixtures will alleviate the vast majority of compliance issues. However, OSHA recommends that manufacturers of mixtures and downstream clients who use their products for further processing and/or manufacture of other mixtures work together to ensure that all parties have sufficient time to comply with this standard. OSHA believes, as it did in 2012, that ‘‘[t]hese types of issues are generally addressed by the market, and the needs of a manufacturer’s customers’’ (77 FR 17739). In addition, where particular circumstances warrant special consideration (such as where a downstream user has not received the necessary information despite its best efforts), OSHA retains enforcement discretion to address those situations as appropriate. 
Hach and ACA also requested an 
unlimited sell-through period for products labeled prior to the compliance deadlines to prevent waste and unnecessary compliance burden (Document IDs 0323, p. 10; 0368, p. 10). Hach noted that ‘‘[e]xisting label stock would cover thousands of products. Without an unlimited sell-through these existing stocks would need to be disposed of and manufactured products would need to be relabeled’’ (Document ID 0323, p. 10). While OSHA is not specifically providing unlimited time to use already-created labels on existing stock, the agency is finalizing an update to paragraph (f)(11) which allows manufacturers, importers, and distributors to not relabel chemicals that 
have been released for shipment and are awaiting distribution, which will reduce the need to dispose of existing label stock and eliminate relabeling for those products. See the Summary and Explanation for paragraph (f) for further discussion of the update to paragraph (f)(11). 
Several commenters recommended 
that the compliance dates should align 
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with other countries (Document ID 
0279, p. 2; 0327, p. 2; 0347, p. 15; 0359, p. 5). In particular, HCPA, Dow, and ACC recommended that OSHA coordinate compliance dates with Health Canada’s WHMIS update (Document ID 0347, p. 15; 0327, p. 2). OSHA notes that Health Canada has already published their update to the HPR and they are now aligned with Rev. 7 (see https://www.canada.ca/en/ health-canada/services/environmental- workplace-health/occupational-health- safety/workplace-hazardous-materials- information-system/amendments- hazardous-products-regulations.html) with a compliance date of December 14, 2025. The agency will, however, work with Canada to address stakeholder concerns regarding the timing of updates and related compliance dates as 
OSHA has done with other cross-cutting 
issues. Additionally, OSHA notes that chemical manufacturers have the option 
to coordinate their compliance with 
Canada and OSHA’s updated requirements by coming into compliance with whichever country’s compliance dates occur first. 
OSHA also received requests for 
clarification related to the proposed compliance deadlines. ICBA, NRI, AF&PA and AWC, and ILMA stated that the terms ‘‘evaluating substances’’ and ‘‘evaluating mixtures’’ in proposed paragraphs (j)(2) and (j)(3) were unclear (Document ID 0291, pp. 2–4; 0356, p. 10; 0326, pp. 7–9; 0287, p. 10). ICBA noted that if OSHA meant the term ‘‘evaluating’’ to refer only to the task of hazard classification, the proposed regulation is unclear as to when manufacturers, importers, or distributors must comply with other new or revised requirements in this final rule, particularly those that normally occur after a determination of a hazard classification, as no other compliance dates were provided (Document ID 0291, p. 3). ICBA, ILMA, and AF&PA and AWC sought to clarify which provisions of the final rule have a compliance deadline of 60 days, one year, and two years after the effective date of the final rule (Document ID 0291, p. 3; 0356, p. 10; 0287, p. 10). Relatedly, ASSP raised concerns about the sufficiency of the compliance periods for training requirements specifically, and recommended that OSHA implement a transition period to allow employers adequate time to retrain workers (Document ID 0284, p. 2). 
OSHA intends that the terms 
‘‘evaluating substances’’ and ‘‘evaluating mixtures’’ include hazard 
evaluations and updates to classification, labeling, and SDSs required to comply with the revisions in 
this final rule. These changes are to be completed by 18 months from the effective date for substances (paragraph (j)(2)(i)) and by 36 months from the effective date for mixtures (paragraph (j)(3)(i)). Because this final rule contains only limited revisions of the hazard classification rules, the agency does not anticipate that most employers will 
need to complete additional 
requirements that follow from changes to hazard classification, namely, updating any alternative workplace labeling used under paragraph (f)(6), updating the hazard communication program required by paragraph (h)(1), and providing any additional employee training in accordance with paragraph (h)(3) for newly identified hazards. However, recognizing that some employers will need to complete these requirements, OSHA is adding new paragraphs (j)(2)(ii) and (j)(3)(ii) to the final rule. Those paragraphs provide an additional six months after the compliance dates to complete any necessary updates to alternative workplace labeling, updates to the hazard communication program, and additional employee training for newly identified physical or health hazards resulting from evaluation of substances and mixtures (that is, 24 months after the effective date for substances and 42 months after the effective date for mixtures). 
None of the provisions revised in this 
final rule have an immediate compliance deadline on the effective date of the final rule ( i.e., 60 days after 
the date of publication of the final rule). To further clarify how employers can comply with the HCS through the implementation phase of the final rule, OSHA is adding a new paragraph (j)(4), which provides that chemical manufacturers, importers, distributors, and employers may comply with either § 1910.1200 revised as of May 20, 2024, or the previous version of this standard, or both during the transition period. 
In conclusion, for the reasons 
discussed above, OSHA is finalizing paragraph (j) with the following modifications: chemical manufacturers, importers, and distributors evaluating substances are required to comply with all modified provisions of the HCS no later than 18 months after the effective date (paragraph (j)(2)(i)) and those entities evaluating mixtures must comply with all modified provisions no later than 36 months after the effective date (paragraph (j)(3)(i)); new paragraphs (j)(2)(ii) and (j)(3)(ii) require employers to update any alternative 
workplace labeling under paragraph (f)(6), update the hazard communication program required by paragraph (h)(1), 
and provide any additional employee training in accordance with paragraph (h)(3) for newly identified hazards no later than 24 months following the effective date for substances and 42 months following the effective date for mixtures; and new paragraph (j)(4) provides that chemical manufacturers, importers, distributors, and employers may comply with either the previous version of this standard, the version finalized in this rule, or both during the transition period. The revised paragraph (j) will replace the regulatory text previously included in paragraph (j). 
C. Appendix A 
Appendix A addresses the health 
hazards covered by the HCS, including 
classification criteria consistent with the GHS. 
OSHA proposed to update Appendix 
A in several respects. The agency’s finalized changes to Appendix A, its review of the comments and testimony received on the proposed changes to Appendix A, and OSHA’s response to these comments and testimony are discussed in order of revisions to specific health hazards in Appendix A, followed by general changes to definitions and terminology, clarification of mandatory requirements, and corrections. 
At the time that OSHA’s NPRM was 
published, OSHA provided a redline strikeout version of Appendix A, which reflected all of OSHA’s proposed revisions, in the docket and on the OSHA website (Document ID 0222, pp. 39–115) so that interested parties could 
view all of the proposed changes in context. OSHA will update this document to show the changes being made in this final rule and strongly encourages stakeholders to review that document in conjunction with the discussion of the revisions, as the discussion provided in this final rule’s Summary and Explanation does not fully describe all of the non-substantive or editorial changes OSHA is making in Appendix A. Stakeholders can examine the redline strikeout of the regulatory text (changes from 2012 HCS to this final) at OSHA’s HCS web page ( https:// 
www.osha.gov/dsg/hazcom/) to view all 
of the changes to the 2012 HCS made in this final rule. 
OSHA received comments broadly 
supporting its proposed revisions to Appendix A. (NAIMA stated that it ‘‘supports the extensive changes to Appendix A because the classification is clarified in a positive manner and not changed . . . NAIMA agrees [with OSHA] that proposed amendments will bring greater clarity’’ (Document ID 
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0338, p. 7). ILMA stated, ‘‘ILMA and its 
members are generally supportive of OSHA’s proposed changes to Appendix A. While largely editorial, these changes better synchronize the Hazard Communication Standard with the GHS and, with respect to ease of international trade, such synchronization to those other jurisdictions, which are adopting more recent versions of the GHS, assist ILMA members who do business internationally’’ (Document ID 0404, Att. 2, p. 1). ILMA further requested that OSHA publish guides to assist the regulated community with classification, particularly smaller companies who may not use subscriptions to database-driven hazard communication software and who may not understand how to incorporate non- 
animal testing results in their 
classifications of mixture products (Document ID 0404, Att. 2, p. 2). OSHA 
anticipates updating some of the 
existing hazard communication standard guidance products, such as the Hazard Classification guidance (Document ID 0008), and also anticipates developing new products to assist the regulated community in complying with the updated standard. 
OSHA’s proposed revisions to 
Appendix A are reviewed in detail below, together with a review of the comments and testimony received on each proposed revision and discussion of the provisions adopted in the final rule. 
I. General Classification Considerations 
(Appendix A.0) 
In paragraph A.0.1, OSHA proposed 
to add a note from paragraph 1.3.3.1.3 of Rev. 7 (Document ID 0060, p. 21), providing that ‘‘Where impurities, additives or individual constituents of a substance or mixture have been identified and are themselves classified, they should be taken into account during classification if they exceed the cut-off value/concentration limit for a given hazard class.’’ OSHA did not include this note in the HCS in 2012 because the definition of substance in 
paragraph (c) references additives and impurities, and therefore the 
classification of substances necessarily takes impurities and additives into account. Nonetheless, the agency came to believe that this note adds clarity and is useful for aligning with the GHS, so proposed to add this note as paragraph A.0.1.3. OSHA’s intent in proposing this provision was to clarify that manufacturers and importers must consider the hazards of all classified components when classifying chemicals, which the agency believed would help ensure accurate 
classification of chemicals and therefore improve protections for workers. 
OSHA received one comment 
regarding its proposed addition (Document ID 0316, pp. 11–12). API supported the proposed revision, noting that the proposed language aligns with the UN GHS and prior OSHA guidance (Document ID 0316, pp. 11–12). OSHA 
did not receive any comments objecting 
to the proposed addition of the note from Paragraph 1.3.3.1.3 of Rev. 7; therefore, the agency has finalized the addition of this provision in new paragraph A.0.1.3. 
Cal/OSHA, Cal/HESIS, Worksafe and 
National COSH submitted suggestions that OSHA should modify paragraph A.0.3.5 to require a single positive study to determine the hazard classification (Document ID 0322, Att. 1, p. 9; 0313, p. 5; 0354, p. 1; 0407, p. 12). Cal/OSHA stated that ‘‘[r]equiring disclosure of the findings of a single positive study that reports ‘statistically and biologically significant positive results’ is important for a number of reasons.’’ They noted that this single positive study rule would (1) represent the highest possible standard of evidence in establishing causation in health studies, (2) address the issue that scientific standards of evidence can bias health effects studies toward false negative results, (3) remove the economic incentive for a manufacturer, importer or classifier not to classify based on a single study, and (4) reduce ‘‘information asymmetries’’ between producers and downstream buyers (Document ID 0322, Att. 1, pp. 9–12). 
OSHA did not propose any changes to 
A.0.3.5, therefore, these comments are out of scope for this rulemaking. Additionally, OSHA discussed its decision to remove the across-the-board ‘‘one-study’’ approach in the 2012 update to the HCS. The agency explained that the hazard evaluation process in the HCS goes beyond simply identifying one study and was 
preferable because it includes a complete evaluation of all of the information available when determining what information to transmit to users of the chemical, although the one-study approach was still included in some criteria in the 2012 HCS (77 FR 17708). 
OSHA also proposed to modify the 
introduction of paragraph A.0.4.1, 
which previously characterized the 
process of mixture classification 
provided in A.0.4.1(a) through (c) as 
‘‘recommended,’’ to instead characterize 
the specified process as mandatory. 
OSHA did not receive any comments 
objecting to the proposed revision. 
Therefore, the agency has finalized the introduction of paragraph A.0.4.1 to 
state that, except as provided in A.0.4.2, the process of mixture classification is based on the specified sequence of steps in A.0.4.1(a) through (c). 
John Baker submitted a comment 
expressing support for the existing language of paragraph A.0.4.3.2, which specifies that, if the classifier has information that the hazard of an ingredient will be evident ( i.e., it 
presents a health risk) below the specified cut-off value/concentration limit, the mixture containing that ingredient must be classified accordingly, in light of the unique hazards posed by nanoscale particles. Baker noted that ‘‘[t]his is important because the health (and to some extent, physical) hazard posed by nanoscale particles is related to the large number of particles rather than their aggregate weight percentage in the mixture’’ (Document ID 0302). OSHA did not propose to alter paragraph A.0.4.3.2, therefore, it is unchanged in the final rule. 
II. Acute Toxicity (Appendix A.1) 
In paragraph A.1.1, OSHA proposed 
to revise the definition of acute toxicity 
to refer to serious adverse health effects 
(i.e., lethality) occurring after a single or 
short-term oral, dermal, or inhalation exposure to a substance or mixture. The previous definition referred to adverse effects occurring following oral or dermal administration of a single dose of a substance, or multiple doses given within 24 hours, or an inhalation exposure of four hours. This change was 
proposed to align with Rev. 7 (Document ID 0060, p. 115; 0131). 
Cal/OSHA commented that the acute 
toxicity definition needed more clarity. 
Specifically, they noted that a ‘‘serious health effect’’ is not synonymous with death (i.e., lethality) and that OSHA 
contradicted itself in A.1.2.1 if it intended ‘‘serious health effect’’ to mean death (Document ID 0322, Att. 2, p. 1). Cal/OSHA also commented that ‘‘acute toxicity has to do with the timing of health effects, not their nature; therefore, it is not appropriate to use the term ‘serious’ to qualify ‘health effects’ ’’, and that ‘‘there are many forms of acute toxicity that do not lead to death,’’ ranging from mild ( e.g., skin 
irritation) to serious (e.g., eye damage) 
to deadly (e.g., pulmonary edema) 
(Document ID 0322, Att. 2, pp. 1–2). Finally, they noted that non-lethal health effects are covered by their respective sections in Appendix A and that the introductory material for acute toxicity should make this clear. 
OSHA agrees with Cal/OSHA that the 
general term ‘‘acute’’ refers to timing, 
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rather than severity, of effects. In the 
proposed language, the term ‘‘acute’’ refers to health effects ‘‘occurring after a single or short-term oral, dermal, or inhalation exposure to a substance or mixture.’’ However, as Cal/OSHA observed, non-lethal health effects are covered by their respective sections in Appendix A, and thus the inclusion of ‘‘serious adverse health effects ( i.e., 
lethality)’’ is a necessary component of the definition to indicate to regulated parties that within the HCS framework the classification of acute toxicity is only used when the effects are sufficiently severe in order to avoid duplicative classifications or unnecessary confusion between hazard classifications. 
Furthermore, the phrase ‘‘serious 
adverse health effects (i.e., lethality)’’ in 
the proposed definition is not intended to imply that OSHA considers serious adverse health effects to be, in general, synonymous with death. Rather, this phrase is taken from the GHS and is intended to signify that the endpoint of the toxicological test methods used to classify for ‘‘acute toxicity’’ is the death of animals in the test population. The definition’s reference to lethality is intended to distinguish between hazards that meet the classification criteria established for ‘‘acute toxicity,’’ utilizing toxicological test methods with an endpoint of lethality, from hazards which are acute in nature, but which should be classified under other sections in Appendix A because the available information does not indicate lethality. The phrase does not represent a determination by OSHA that other health effects are not serious in the sense of being ‘‘material’’ for the purposes of the OSH Act. 
Finally, OSHA disagrees with Cal/ 
OSHA that the new text added to A.1.2.1 contradicts the agency’s use of ‘‘lethality’’ in the proposed definition of ‘‘acute toxicity.’’ Although some in vivo 
methods include indicators such as ‘‘significant clinical signs of toxicity’’ to approximate LD
50/LC 50values, these 
methods are using the clinical signs of toxicity to indirectly determine the acute toxicity estimate (ATE) which is nevertheless intended to characterize the lethality of a toxic substance. Therefore, OSHA maintains that its 
revisions to A.1.2.1 do not contradict its use of the term ‘‘lethality’’ to characterize the endpoint used to classify a hazard under ‘‘acute toxicity.’’ OSHA therefore declines to adopt the recommendations made by Cal/OSHA regarding the definition of acute 
toxicity. 
John Baker commented that the 
modified definition is ‘‘vague as to the dimension of time’’ and recommended 
that OSHA amend the proposed definition of acute toxicity to refer to serious health effects (i.e., lethality) 
occurring following oral or dermal administration of a single dose of a substance, or multiple doses ‘‘given within 24 hours or an inhalation exposure of 4 hours’’ (Document ID 0302). However, OSHA notes that the references to time in the acute toxicity definition were purposely removed so that the definition would be more general and neutral with respect to test guidelines (86 FR 9705). Since the HCS is test method neutral, OSHA believes that the definitions in the HCS should not include timeframes as listed in specific test guidelines. Therefore, OSHA has retained the proposed modifications in the acute toxicity definition to exclude timeframes in the final rule. 
For the reasons discussed above, 
OSHA is finalizing the definition of acute toxicity in paragraph A.1.1 as proposed. 
OSHA also proposed to revise the 
classification criteria for substances in A.1.2.1 to indicate that ‘‘[w]hile some in 
vivo methods determine LD
50/LC 50 
values directly, other newer in vivo 
methods (e.g., using fewer animals) 
consider other indicators of acute toxicity, such as significant clinical signs of toxicity, which are used by reference to assign the hazard category.’’ This change was proposed to align with classification criteria in the Rev. 7 (Document ID 0060, p. 115; 0131). 
The Physicians Committee for 
Responsible Medicine (PCRM) supported this revision and recommended that OSHA include the Collaborative Acute Toxicity Modeling Suite (CATMoS) for screening chemicals for acute oral toxicity, which can be used to predict GHS classification (Document ID 0295, p. 2). As the HCS is test method neutral and, as stated in A.0.2.2, test guidelines that have been scientifically validated are acceptable, 
OSHA has not included a specific reference to CATMoS in paragraph A.1.2.1 in the final rule. However, the agency will consider including information about CATMoS in one of its guidance products, as it may be helpful to classifiers. API also supported the proposed revision, noting its alignment with the GHS (Document ID 0316, p. 15). Therefore, OSHA has finalized the classification criteria for substances in A.1.2.1 as proposed. 
OSHA also proposed slight revisions 
to Table A.1.1 to align with Rev. 7 (Document ID 0060, p. 115; 0131). The GHS presents the ATE range in Table A.1.1 using the term ‘‘ATE’’ to express the range, while the 2012 HCS uses the term ‘‘and.’’ OSHA proposed to change the ‘‘and’’ in the ATE ranges to ‘‘ATE’’ to align with Rev. 7. The proposed modification was not to change the classification criteria itself, but as OSHA explained in the NPRM, would be more technically accurate and consistent with the way the table is expressed in the European Chemicals Agency’s Guidance on the Application of the CLP Criteria: Guidance to Regulation (EC) No 1272/ 2008 on classification, labelling, and packaging of substances and mixtures (Document ID 0256, pp. 237–238). 
Michele Sullivan suggested that the 
format used in the 2012 HCS Table A.1.1 should be retained, as it is familiar to small businesses, businesses, and stakeholders operating in the U.S. According to Sullivan, the ‘‘focus of the USA OSHA HCS should be to express technically correct values in a format easy to understand for USA stakeholders, not to be consistent with formatting in EU regulations’’ (Document ID 0366, p. 7). 
Tom Murphy commented that ‘‘the 
information to be conveyed in [Table A.1.1] is in the format ‘>5 ATE ≤50.’ The 
placement of the acronym in the format of the proposed rule makes the information difficult to comprehend at a glance, and this opportunity for a systemic failure is easily addressed: please consider changing the format of the table entries to either ‘5 < ATE ≤ 50’ 
or ‘ATE > 5 and ATE ≤ 50’ ’’ (Document 
ID 0277, p. 1). 
OSHA believes that the proposed 
format, in addition to aligning with Rev. 7 and the EU’s CLP regulation, is also more technically correct than the format used in the 2012 Table A.1.1. The ATE values define the hazard categories for acute toxicity. For example, if a gas has an ATE of less than or equal to 100, then it should be classified as Category 1. The format used in the 2012 version of the standard included just the number ‘‘≤ 100’’ under the Category 1 column, 
while the proposed Table A.1.1 includes ‘‘ATE ≤ 100’’. OSHA believes that the 
proposed format displays the criteria in a more technically accurate way, and that classifiers will understand the information presented in this format. As such, OSHA has retained the modifications to Table A.1.1 in the final rule. While Tom Murphy’s suggested change is technically equivalent to OSHA’s proposal, it is not evident that Murphy’s notation would be significantly easier to understand ‘‘at a glance’’ nor would it be consistent with the GHS or other international partners. Therefore, OSHA is not adopting the suggestion. 
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OSHA is also making a correction to 
the heading of Table A.1.1 in the final 
rule. The heading of Table 3.1.1 in Rev. 7 states, ‘‘Acute toxicity estimate (ATE) values and criteria for acute toxicity hazard categories.’’ OSHA inadvertently left out the change to the heading in the NPRM and is making the editorial correction in this final rule to maintain alignment with the GHS. 
OSHA proposed to include a new 
sentence at the end of paragraph A.1.2.3 to clarify that data from both animal tests and human studies should be considered in evaluating acute toxicity. The proposed text stated that ‘‘[i]n cases where data from human experience ( i.e., 
occupational data, data from accident databases, epidemiology studies, clinical reports) is also available, it should be considered in a weight of evidence approach consistent with the principles described in A.0.3.’’ To ensure human data is considered in classifying chemicals for all acute toxicity hazard categories, the GHS added this clarifying text in paragraph 3.1.2.3 (Document ID 0131, p. 116) and OSHA proposed adding this sentence to align with Rev. 7. OSHA did not receive any comments pertaining to the proposed revision. Therefore, the agency is finalizing paragraph A.1.2.3 as proposed. 
OSHA proposed a new paragraph 
A.1.2.4 which corresponds to Chapter 3.1 (paragraph 3.1.2.6.5) in Rev. 7 (Document ID 0060, p. 117). The agency proposed this paragraph and its subparagraphs to require the classifier to consider whether the chemical is corrosive to the respiratory tract if data are available that indicate that the mechanism of toxicity was corrosivity of the substance or mixture. The proposed paragraph was also to clarify that the hazard corrosive to the respiratory tract 
is covered under the HCS. 
As OSHA explained in the NPRM, the 
agency did not explicitly include the corrosive to the respiratory tract hazard 
in the HCS in 2012 but explained in its guidance, OSHA 3844: Hazard 
Communication: Hazard Classification Guidance for Manufacturers, Importers, and Employers, that this hazard should be considered during classification (Document ID 0008, p. 48). The Hazard Classification guidance explains that if the classifier has data indicating that 
there is acute inhalation toxicity with corrosion of the respiratory tract that leads to lethality, then the substance or mixture may be labeled with the additional hazard statement ‘‘corrosive to the respiratory tract.’’ However, if the classifier has data that indicate acute inhalation toxicity with corrosion of the respiratory tract and the effect does not lead to lethality, then the guidance 
explains that the hazard may be addressed in the Specific Target Organ Toxicity (STOT) hazard classes included in Appendices A.8 and A.9 of the HCS. OSHA proposed to include these clarifications in paragraphs A.1.2.4.1 and A.1.2.4.2, and to change the ‘‘may’’ language from the guidance 
to ‘‘must’’ language to ensure that 
corrosive to the respiratory tract is 
appropriately considered during the classification process. 
OSHA received several comments on 
proposed paragraph A.1.2.4. NIOSH supported OSHA’s proposed addition of paragraph A.1.2.4, noting that it ‘‘adds information to help protect workers’ safety and health,’’ is in line with the intent of the original 1983 HCS, and facilitates the design and implementation of protective measures appropriate to the hazard (Document ID 0281, Att. 2, p. 5). ILMA also supported the addition of proposed paragraph A.1.2.4, noting that it would assure appropriate consideration of hazards corrosive to the respiratory tract during the classification process (Document ID 0356, Att. 1, p. 5). ICT agreed that the addition of A.1.2.4 ‘‘clarifies that some lethal inhalation effects are not due to systemic poisoning but are due to local destruction of respiratory tissue’’ (Document ID 0324, p. 5). 
ICT also requested clarification on 
when the statement would be applicable. Both ICT and an anonymous commenter asked whether OSHA intended the ‘‘Corrosive to the respiratory tract’’ hazard statement for use instead of, or in addition to, the existing hazard statements ( e.g., ‘‘Fatal if 
inhaled’’) related to acute toxicity by the inhalation route (Document ID 0265; 0324, p. 5). 
ACC asked OSHA to clarify the 
proposed text in paragraphs A.1.2.4.1 and A.1.2.4.2. ACC indicated that ‘‘in many cases, suppliers may choose to warn for corrosion to the respiratory tract simply based on a substance being corrosive to eyes and skin,’’ and that ‘‘without knowledge as to whether this effect leads to lethality, it is not clear how suppliers should classify.’’ ACC further stated that it is unclear what OSHA’s intent is in referring to the regulatory text for STOT classifications and questioned what the agency meant 
by the term ‘‘addressed’’ in A.1.2.4.2 (Document ID 0347, p. 16). In answer to these requests for clarification, OSHA has modified the proposed language. The following discussion explains the general classification process and how label preparers are to apply a hazard statement for corrosion of the respiratory tract based on the final text. To further clarify how corrosive effect to 
the respiratory tract should be addressed, OSHA is adding a note to each of the relevant tables in Appendix C. 
When classifying for corrosive to the 
respiratory tract the classifier should take a tiered approach. If the classifier has data to indicate the chemical is corrosive to the respiratory tract and the effect leads to lethality, then the label should contain the hazard statement ‘‘Corrosive to the respiratory tract’’ and the corrosion pictogram in addition to the prescribed acute toxicity hazard statement(s) and other label and SDS elements. If the classifier has data that indicate the chemical is corrosive to the respiratory tract but does not lead to lethality, then the chemical should be classified using the criteria as provided under STOT single exposure (STOT– SE). The label should then include the hazard statement ‘‘Corrosive to the respiratory tract if inhaled.’’ This hazard statement should be used instead of a more general STOT–SE hazard statement for the respiratory tract ( e.g., 
‘‘Causes damage to respiratory tract if inhaled’’) and unlike the corresponding statement for acute toxicity, this hazard statement includes ‘‘if inhaled’’ because A.8.2.1.2 requires the relevant route(s) of exposure by which the classified substance produces damage to be identified. Additionally, OSHA is requiring the use of the more specific corrosion pictogram instead of the more general health pictogram when this hazard is addressed under STOT. However, if there are other target organ hazards, the current STOT hazard statement and pictogram should be used to communicate those hazards, in addition to the required hazard statement and pictogram for corrosive to the respiratory tract. 
Finally, in response to ACC’s 
comment on classifiers’ current practices, OSHA is modifying the proposed language to state that if the classifier does not have direct data on corrosivity to the respiratory tract (and would therefore not classify the chemical under STOT–SE) but the chemical is classified under either skin corrosion/irritation or serious eye damage/eye irritation, the classifier must consider the available data (including skin and/or eye data) to determine whether the chemical may be corrosive to the respiratory tract if inhaled. If they determine that it may be corrosive to the respiratory tract, they must include the hazard statement corrosive to the respiratory tract along with the already required hazard 
statement (e.g., causes severe skin burns and eye damage) and pictogram (e.g., 
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corrosion) to ensure that the respiratory 
corrosion hazard is communicated to downstream users. This is intended to ensure workers have complete hazard information when handling a substance or mixture that may cause corrosion to the respiratory tract in order to avoid gases, vapors, or mists that may be generated under certain conditions ( e.g., 
accidental spill) even if the substance or mixture is not intended for such an exposure route. 
As OSHA indicated in proposed 
paragraph A.1.2.4, the corrosive to the respiratory tract classification is intended to be used, when appropriate, in addition to the inhalation toxicity classification and the hazard statement ‘‘corrosive to the respiratory tract’’ would be used in addition to the hazard statements for acute toxicity. To clarify this provision, OSHA has modified proposed paragraph A.1.2.4.1 to state, ‘‘If the classifier determines the chemical is corrosive to the respiratory tract and data are available that indicate that the effect leads to lethality, then in addition to the appropriate acute toxicity pictogram and hazard statement, the chemical must be labeled with the hazard statement ‘corrosive to the respiratory tract’ and the corrosion pictogram.’’ OSHA anticipates providing additional guidance on the ‘‘Corrosive to the respiratory tract’’ hazard statement following publication of the final rule. 
Cal/OSHA commented that paragraph 
A.1.2.4.1, as written in the NPRM, would not adequately warn workers and emergency responders, reasoning that when inhalation of a corrosive chemical substance ‘‘leads to lethality,’’ that information should be communicated on the label, not just on the SDS (in some cases ‘‘Fatal if inhaled’’ would appear on the SDS) (Document ID 0451, Att. 1, p. 2). Cal/OSHA suggested alternative language for A.1.2.4.1 to require that, if the classifier determines a chemical is corrosive to the respiratory tract and data are available that indicate that the effect leads to lethality, then the chemical must be labeled with either the hazard statement, ‘‘This chemical is corrosive to the respiratory tract and can cause death if inhaled’’ or ‘‘This chemical is corrosive to the respiratory tract and can be fatal if inhaled’’ 
(Document ID 0451, Att. 1, p. 2). 
Because the hazard statement 
‘‘Corrosive to the respiratory tract’’ would supplement, rather than replace, the appropriate acute toxicity pictogram and hazard statement, OSHA disagrees with Cal/OSHA that the proposed supplemental hazard statement ‘‘Corrosive to the respiratory tract’’ should be modified from the GHS statement when the data indicate 
lethality. The acute toxicity statements already indicate lethality when appropriate. For example, a chemical that is acute inhalation toxicity Category 1 and is corrosive to the respiratory tract will carry the skull and crossbones pictogram and the hazard statement ‘‘Fatal if inhaled’’ in addition to the 
‘‘Corrosive to the respiratory tract’’ 
statement. 
An anonymous commenter asked 
whether hazard categories are being established for ‘‘Corrosive to the respiratory tract’’ and, if so, how the categories will be defined, how mixtures should be classified that contain component(s) deemed ‘‘Corrosive to the respiratory tract,’’ and if cut-off values would be established. They also noted that this hazard statement does not appear in Appendix C of the proposed standard and asked what signal word, pictogram, and precautionary statements should appear on the SDS and label when the ‘‘Corrosive to the respiratory tract’’ hazard statement is used (Document ID 0265). 
As explained above, the ‘‘corrosive to 
the respiratory tract’’ hazard is not a distinct hazard class. Therefore, no hazard categories will be established for it. Classification of mixtures would follow the same principles as for other health hazards. If there are no data for the mixture as a whole, mixtures that contain component(s) deemed corrosive to the respiratory tract should be classified as acutely toxic, STOT–SE, skin corrosion/irritation, or eye damage/ irritation and carry the appropriate pictogram(s), signal word, hazard statement(s) and precautionary statement(s) on the label and SDS based on the hazard class and category. The SDS and label for the mixture will also contain the hazard statement ‘‘Corrosive to the respiratory tract’’ (for acute toxicity, skin corrosion/irritation, or eye damage/irritation) or ‘‘Corrosive to the respiratory tract, if inhaled’’ (for STOT– SE). As discussed above and in the Summary and Explanation for Appendix C, OSHA agrees that the hazard statements for corrosion to the respiratory tract should be included in Appendix C along with the other label element information and has included it there in the final rule. The Summary 
and Explanation for Appendix C includes further discussion of the label element requirements associated with corrosion to the respiratory tract. 
ACC expressed concern about the 
impact of this proposal on GHS 
harmonization, stating that ‘‘[t]he 
introduction of a new Acute Toxicity and Specific target organ toxicity (single exposure) (STOT SE) classification for corrosion to the respiratory tract will 
cause a number of significant classification differences between jurisdictions and confusion among manufacturers and importers’’ and argued that the information could be accurately represented in Section 11 of the SDS. They noted the EU as an example which ‘‘includes supplementary EUH [European Union hazard] phrases, but does not require the use of an entirely separate classification’’ (Document ID 0347, p. 16). 
Furthermore, ACC stated that STOT 
classifications are not appropriate for classifying respiratory corrosion. According to ACC, STOT repeat exposure (STOT–RE) is not appropriate because respiratory corrosion is an acute effect; STOT–SE Category 1 or Category 2 are also not appropriate because respiratory corrosion is not a systemic effect; and STOT–SE Category 3 is not appropriate because it only refers to respiratory irritation (Document ID 0347, p. 17). VelocityEHS similarly opined that corrosion to the respiratory tract does not fit the criteria under STOT because ‘‘damage from corrosivity/causticity is not usually tied to a specific organ, but damages multiple tissues (skin, eyes, mucus membranes). Corrosive/caustic substances damage whatever tissue they come into contact with, and therefore do not meet the definition of being target organ specific’’ (Document ID 0320, p. 2). 
OSHA disagrees with ACC and 
VelocityEHS’ position that STOT criteria should not be used for corrosion to the respiratory tract. Specifically, OSHA disagrees with ACC’s position that STOT–SE Category 1 and Category 2 cover only systemic effects and are therefore not the appropriate hazard classes and categories to address the corrosion of the respiratory tract hazard. The GHS recognized that local effects are also covered under STOT in Rev. 2, published in 2007. Prior to Rev. 2, the hazard class chapter was entitled ‘‘Specific Target Organ/Systemic Toxicity.’’ In Rev. 2, the UNSCECHS agreed to replace the term ‘‘Specific target organ/systemic toxicity’’ and all its related terms with ‘‘Specific target organ toxicity’’ on the understanding that, according to paragraphs 3.8.1.1 and 3.9.1.1 of the GHS, ‘‘all significant health effects that impair function (both reversible and irreversible, immediate and/or delayed) are regarded to be ‘‘target organ toxicity’’, irrespective of the toxic effects being local or not’’ (ST/ SG/AC.10/C.4/22, available at https://
unece.org/DAM/trans/doc/2006/ac10c4/ 
ST-SG-AC10-C4-22e.pdf, p. 6). 
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Corrosion to the respiratory tract fits the 
meaning of ‘‘Specific target organ toxicity’’ as explained by the UNSCECHS. 
Similarly, OSHA disagrees with 
VelocityEHS’s reasoning that the occurrence of corrosion in multiple organs (e.g., skin, eye, mucus 
membranes) excludes classification for a respiratory tract STOT. Under STOT–SE in the HCS (A.8.1.4), classifiers should take into consideration both changes in a single organ or biological system and generalized changes of a less severe nature involving several organs. 
However, OSHA agrees with ACC that 
since respiratory tract corrosion is an acute effect, STOT RE is not an appropriate hazard class for corrosion of the respiratory tract. OSHA is therefore removing the reference to A.9 from A.1.2.4.2. OSHA also agrees that corrosion of the respiratory tract would not be appropriately classified as STOT–SE Category 3 because it would not meet the criteria in A.8.2.2. The language in A.1.2.4.2 is a general reference that corrosive to the respiratory tract should be classified under STOT and therefore no regulatory text change is necessary to exclude STOT Category 3. Additionally, to make this clear, OSHA has not included a note regarding corrosive to the respiratory tract in Appendix C under the table for STOT–SE Category 3. For the reasons explained above, OSHA maintains that STOT–SE Category 1 and Category 2 should be used for classifying corrosive to the respiratory tract hazards when the data meet the criteria and indicate the effect does not lead to lethality. 
OSHA disagrees with ACC’s comment 
that the use of STOT criteria would cause significant classification differences between jurisdictions, including diverging from the EU’s approach to classification. OSHA notes that ACC may have misunderstood OSHA’s intent regarding corrosive to the respiratory tract since paragraph A.1.2.4 incorporates additional hazard phrases but does not create an entirely separate classification, which is also, as ACC noted, how the EU treats corrosion of the respiratory tract. However, OSHA has made changes to the approach so that the label and SDS would be more consistent with other jurisdictions, 
including the EU. First, OSHA has updated the label elements under STOT–SE for consistency so the hazard statement and pictogram on the label (and SDS) would be equivalent to the EU. Additionally, OSHA has updated its approach to include the hazard statement ‘‘Corrosive to the respiratory tract’’ under Appendices A.2 and A.3 when there are insufficient data to 
support classification under STOT. This is similar to the EU approach where if a chemical is corrosive and the chemical may be inhaled then the EUH071 ‘‘Corrosive to the Respiratory Tract’’ hazard phrase must be used. Furthermore, OSHA disagrees with ACC that information on corrosivity to the respiratory tract can be sufficiently covered in Section 11 of the SDS, as 
Section 11 is not typically used to 
convey important toxicity information to workers at a level of generality appropriate to a lay reader, but rather to safety and health experts at a more detailed level. 
VelocityEHS further commented that 
labeling elements present for corrosive to the respiratory tract versus acute toxicity and STOT could be confusing or misleading to a worker since the pictogram for corrosion is different. To illustrate this issue, VelocityEHS provided an example indicating that if a chemical is corrosive to the respiratory tract, but the effect does not lead to lethality, corrosion still occurs and is likely corrosive to the skin and eye. In that case, they noted that providing the health hazard pictogram to represent the STOT along with the corrosion pictogram could be misleading and confusing as to why the health hazard pictogram was included (Document ID 0320, p. 3) 
VelocityEHS suggested alternate 
criteria for evaluating corrosive to the respiratory tract when it does not lead to lethality, including modified text for paragraph A.1.2.4 and its subparagraphs that lays out a tiered approach for classifying chemicals as corrosive to the respiratory tract. They suggested first classifying chemicals as corrosive to the respiratory tract under the skin or eye hazard classes, and then if not classified under either of these hazard classes, classifying under STOT–SE. VelocityEHS provided additional text for Appendices A.2 (Skin Corrosion/ Irritation) and A.3 (Serious Eye Damage/ Eye Irritation) including classification guidance and label elements for corrosive to the respiratory tract 
(Document ID 0320, pp. 2–7). 
OSHA agrees with VelocityEHS that 
Appendices A.2 and A.3 are relevant for corrosive to the respiratory tract and has 
updated the text of A.1.2.4.2 
accordingly, but disagrees with 
VelocityEHS’s suggestion that they should be the primary hazard classes that should address corrosive to the respiratory tract. As discussed above, OSHA believes that STOT–SE criteria are appropriate when the data indicate corrosion to the respiratory tract and indicate non-lethality; therefore, Appendix A.8 (STOT–SE) is 
appropriate. However, the agency recognizes that in many cases the data may be insufficient to justify a STOT– SE classification and therefore it would be appropriate to include corrosive to the respiratory tract based on data used for either skin corrosion/irritation classification or serious eye damage/eye irritation classification. 
OSHA also disagrees with 
VelocityEHS that workers will find the label elements for acute toxicity confusing or misleading when used alongside label elements for corrosion of the respiratory tract. OSHA understands that workers may be already familiar with the corrosion pictogram because of skin and eye corrosion, and with effective training, the combination of the corrosion pictogram and the skull and bones pictogram for acute toxicity will helpfully and accurately convey the level of severity of the hazard and thus are helpful to include together. However, OSHA does believe that more targeted hazard communication is warranted for STOT SE and, as explained above, is adding a new hazard statement ‘‘Corrosive to the respiratory tract, if inhaled’’ and requiring the use of the corrosivity pictogram instead of the health pictogram. Workers will also need to be trained on the corrosive to respiratory tract hazard and that they may see the corrosion pictogram in addition to the skull and crossbones, but OSHA believes that with the training required under the HCS these modifications will ultimately provide better information and will not be confusing. 
However, OSHA also notes that in 
Appendix C, the agency gives direction on the label elements and in particular has added a new paragraph in this rulemaking (C.3.2.4) to make clear that if multiple hazards require the same pictogram only one pictogram should appear on the label (see discussion in Appendix C). Additionally, Appendix C provides flexibilities under C.2 (Hazard statements) and C.4 (Precautionary statements) indicating that the label preparer can omit statements if they can show that a statement is inappropriate or that modified statements improve readability. Lastly, the label preparer can provide supplemental information 
to the label (or SDS) as long as the information does not contradict or cast doubt on the required information. With all of these flexibilities, OSHA believes SDS and label preparers will be able to minimize any confusion that VelocityEHS suggests will exist. 
Following the discussion above, 
OSHA is finalizing the new paragraph A.1.2.4 which provides that if the 
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classifier has data indicating that there 
is acute inhalation toxicity, based on lethality data, with corrosion of the respiratory tract, then the substance or mixture should be labeled with the additional hazard statement ‘‘Corrosive to the respiratory tract’’ and the corrosion pictogram. OSHA is retaining the provision that if the classifier has data that indicates corrosion of the respiratory tract and the effect does not lead to lethality, then the hazard must be addressed in the STOT–SE (A.8) hazard class, with the modified hazard statement and corrosion pictogram in lieu of the usual STOT–SE requirements. If there are insufficient data to classify the hazard as STOT, and the classifier determines based on relevant skin and/or eye data that the chemical may cause corrosion of the respiratory tract, then the hazard statement ‘‘Corrosive to the respiratory tract’’ must be used in A.2 and/or A.3, as appropriate. As described further in the summary and explanation for Appendix C, OSHA has also added notes to the relevant sections in Appendix C to further clarify this issue. However, OSHA is removing the reference to STOT–RE (A.9) from paragraph A.1.2.4.2. Additionally, OSHA intends to update its Hazard Classification guidance document (Document ID 0008) following the publication of the final rule and anticipates adding further guidance for ‘‘Corrosive to the respiratory tract.’’ 
Paragraph A.1.3.6.1 explains how to 
classify a mixture when there are data for all of the ingredients in the mixture. Cal/OSHA commented on paragraph A.1.3.6.1 that the units that are used in the ATE formula are unclear and suggested that OSHA provide more explanation and an example using each of the applicable units (Document ID 0322, Att. 2, p. 3). OSHA did not propose a change to the ATE formula in A.1.3.6.1 and therefore this comment is outside the scope of this rulemaking. However, Table A.1.1, Acute toxicity estimate (ATE) values and criteria for acute toxicity hazard categories, provides the units that should be used to calculate the ATE by route of exposure. Additionally, OSHA provides guidance on classification of acute toxicity and examples using the ATE formula in its Hazard Classification guidance document (Document ID 0008, pp. 33–35). 
In Figure A.1.1 and paragraph 
A.1.3.6.2.2, OSHA proposed to correct the cross-reference from A.1.3.6.2.3 to A.1.3.6.2.4. OSHA did not receive any comments pertaining to this proposed revision and is therefore finalizing the corrections to Figure A.1.1 and 
paragraph A.1.3.6.2.2 as proposed. 
OSHA also proposed to amend 
paragraph A.1.3.6.2.3. If a mixture contains an ingredient of unknown acute toxicity at a concentration of at least one percent, paragraph A.1.3.6.2.3 previously required a statement that ‘‘X’’ percent of a mixture consists of ingredient(s) of unknown toxicity on the label and SDS. OSHA proposed to revise this paragraph to require a statement that ‘‘X’’ percent of the mixture consists of ingredient(s) of unknown acute (oral/ 
dermal/inhalation) toxicity on the label 
and SDS in such cases (emphasis added), thus indicating that the percentage of unknown acute toxicity must be differentiated by route of exposure. Given that it is possible to have unknown ingredients for more than one relevant route of exposure (e.g., oral, dermal, inhalation), OSHA reasoned that differentiating the statement by route would be helpful to chemical users. This proposed change aligns with paragraph 3.1.3.6.2.2 in Rev. 7 (Document ID 0060, p. 121). OSHA also proposed to delete the second paragraph in A.1.3.6.2.3 because it is duplicative of the first paragraph. 
ILA supported the proposed revision 
in A.1.3.6.2.3, stating that the change ‘‘adds value to the label and provides valuable information to the end user’’ (Document ID 0315, p. 3). However, ILA also commented that more clarity is needed surrounding when the statement should be used, and that it may be difficult for users to understand when the statement of unknown toxicity is required on a label. Specifically, they asked ‘‘[s]hould the statement be used when the material is classified as Acute Oral/Dermal/Inhalation without testing AND contains components greater than 1% with unknown toxicity? OR if the intention is to place this statement on labels when no testing data is available, the material does not have an acute oral/ dermal/inhalation classification but 
contains components greater than 1% 
with unknown toxicity?’’ (Document ID 
0315, p. 3). 
OSHA’s proposed changes to 
A.1.3.6.2.3 do not affect when the statement of unknown acute toxicity is 
required. As clarified in OSHA’s classification guidance (Document ID 0008, p. 42), the unknown acute toxicity 
statement is required on the label and the SDS where the chemical mixture is already classified as acutely toxic for a particular route of exposure, and there are one or more other ‘‘relevant ingredients’’ of unknown acute toxicity for that particular route. In the event that an ingredient with unknown acute toxicity is used in a mixture at a concentration ≥ one percent, and the 
mixture as whole has not been tested, 
the mixture cannot be attributed a definitive acute toxicity estimate. In this situation, the mixture is classified based on the known ingredients only. A statement that X percent of the mixture consists of ingredient(s) of unknown acute toxicity (oral, dermal/inhalation) is required on the label and SDS in such cases. Conversely, if a mixture as a whole has been tested but is not classified based on this testing, then no statement is required regardless of ingredients (Document ID 0008, p. 42). OSHA anticipates updating this guidance following the publication of the final rule and including a discussion of this provision. 
An anonymous commenter submitted 
a question pertaining to paragraphs A.1.3.6.2.3, C.3.3, and Appendix D of the proposed HCS, which require a statement of the concentration of ingredients of unknown acute toxicity to appear in Section 2 of the SDS and on the label: ‘‘[c]onsider the case of a mixture in which the exact concentration(s) of hazardous component(s) are withheld as trade secrets and reported as prescribed concentration range(s) (pursuant to paragraph (i)(1)(iv)) in Section 3 of the SDS. In Section 2 of the SDS and on the label, is it acceptable to report the percentage of ingredient(s) of unknown acute toxicity as a range corresponding to one of the prescribed ranges, or must the exact percentage be reported?’’ (Document ID 0266). OSHA has addressed this comment below in the Summary and Explanation for Appendix D. 
OSHA received an anonymous 
comment that referred to the ‘‘split entry concept’’ and the agency’s 2013 LOI (available at https://www.osha.gov/laws- regs/standardinterpretations/2013-04- 02), which describes ‘‘split entry’’ as a concept used in the EU that allows for a modified GHS classification in certain situations, such as when particle size in laboratory tests differs from the particle size expected in workplace exposures (Document ID 0270). The commenter asked OSHA to clarify in the HCS how SDS providers should classify ‘‘substances that are acutely toxic by inhalation that are not respirable in the 
form in which they are supplied’’ (Document ID 0270). 
OSHA did not propose to address this 
issue in the NPRM, therefore, the request for clarification in the HCS is outside the scope of this rulemaking. However, OSHA notes that the 2013 LOI states that the HCS 2012 classification process does not support the use of the split entry concept. The agency will 
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consider addressing this issue in 
updated guidance to clarify that the use of ‘‘split entry’’ is still not allowed under the standard. 
After reviewing these comments, 
OSHA is finalizing the proposed changes to paragraph A.1.3.6.2.3. 
III. Skin Corrosion/Irritation and Serious 
Eye Damage/Eye Irritation (Appendices A.2 and A.3) 
OSHA proposed revisions to the 
sections on skin corrosion/irritation and serious eye damage/irritation (Appendices A.2 and A.3), which correspond to Chapters 3.2 and 3.3 in the GHS, respectively. As OSHA explained in the NPRM (86 FR 9703), the UNSCEGHS, in its 16th Session (December 2008), assembled an informal working group to review the content of Chapters 3.2 and 3.3 in the GHS and to propose editorial revisions in order to enhance clarity and user-friendliness in the application of the criteria (Document ID 0093). The group’s primary focus was to change the order of the text to ensure that the classification strategy was clear, and to change the testing scheme to more of an evaluation scheme, since the GHS, like the HCS, is test method neutral. The work of the informal working group was not complete before OSHA published its updates to the HCS in 2012. However, the working group completed its efforts to clarify the skin corrosion/irritation and serious eye damage/eye irritation chapters prior to publication of the NPRM. The work was approved by the UNSCEGHS in 2012 (Document ID 0212). Accordingly, in 2021, OSHA proposed to revise Appendices A.2 and A.3 to incorporate all the modifications to the GHS skin corrosion/irritation and serious eye damage/eye irritation chapters agreed to by the UNSCEGHS up to and including Rev. 7. The agency reasoned that this would ensure that 
OSHA’s HCS remains aligned with the GHS. 
OSHA proposed substantial revisions 
to Appendix A.2 (Skin Corrosion/ Irritation) that reflect the final changes the UNSCEGHS adopted through Rev. 7. However, Rev. 8, published in July 2019 (Document ID 0065, pp. 129–145), expanded the use of non-animal test methods in Chapter 3.2 (skin corrosion/ irritation). These changes include recognition of specific in vitro test methods, reorganization of the chapter, reorganization of the tiered approach with an updated Figure 3.2.1 to reflect those changes, as well as descriptive text on use of new test methods, structure activity relationship (SAR) and read across methods, and an updated decision logic diagram. Table 3.2.1 from Rev. 8 updated the tiered approach for 
classification, including an elevation in acceptance of in vitro data to tier 2 of the approach. The updated tiered approach also included consideration of conflicting lower-tiered data when the lower tier suggests a higher classification level. In addition to the changes in the table, Rev. 8 updated the background information to provide additional guidance for how to use non- animal test data to classify chemicals. 
In Section XV., Issues and Options 
Considered, in the NPRM, OSHA 
requested comments from the regulated 
community to determine if the agency should adopt Chapter 3.2 from Rev. 8 with all of the revisions to the classification scheme. The agency noted that adoption would greatly benefit classification for new chemicals where no existing data currently exists. It also explained that adopting these updates in the HCS would not require a re- evaluation of chemicals already classified because the overall tiered approach for evaluating existing data has been retained. 
OSHA received several comments that 
favored including updates from Rev. 8 in the revised HCS. ILMA supported the inclusion of Rev. 8’s tiered approach in Appendix A.2 and indicated that their members would benefit from the inclusion of data from non-animal testing protocols, although they also noted that changes in criteria for skin and eye irritation would present the biggest compliance challenge to ILMA members and would require ILMA members to spend more time reviewing the updated criteria to assure that all available data are considered (Document ID 0356, pp. 5–6). PCRM also supported incorporating in Appendix A.2 ‘‘all revisions to the classification scheme for skin corrosion/irritation’’ from Rev. 8 (Document ID 0295, p. 1). ACC thanked OSHA ‘‘for taking into consideration the 
additional flexibility that the inclusion 
of Chapter 3.2 (specifically Table 3.2.1) 
provides’’ and expressed support for the 
use of non-animal test methods for 
classification purposes (Document ID 
0347, p. 6). PETA, HCPA, and NAIMA also expressed support for OSHA expanding the use of non-animal testing (Document ID 0282, p. 1; 0327, p. 8; 0338, p. 7). 
NIOSH supported adoption of a tiered 
approach to classification of chemicals 
for skin irritation and corrosion (Document ID 0281, Att. 2, p. 5). NIOSH also recommended that OSHA consider the NIOSH Current Intelligence Bulletin 61: A Strategy for Assigning New NIOSH Skin Notations as a resource (NIOSH [2017]. A strategy for assigning new NIOSH skin notations. Cincinnati, OH: U.S. Department of Health and 
Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2009–147). NIOSH stated that the proposed expansion of the use of nonanimal test methods in evaluating skin corrosion/irritation from Rev. 8 ‘‘would elevate the use of in vitro 
methods in the tiered approach to the classification of chemicals under Appendix A.2 Skin Corrosion/Irritation . . . [and] would be beneficial if systemic effects of the chemical in question have been ruled out. In vitro 
methods predictive of in vivo outcomes continue to improve but may not accurately predict systemic response [Stueckle and Roberts 2019]’’ (Document ID 0281, Att. 2, p. 5). 
A few commenters expressed 
concerns with adopting Rev. 8. Michele Sullivan commented that it was good planning for OSHA to consider adopting Rev. 8, but expressed concern that the regulatory text was not provided (Document ID 0366, p. 2). API similarly requested that OSHA provide the exact regulatory language (Document ID 0316, p. 31). In response to these stakeholder concerns regarding the regulatory text, OSHA notes that the NPRM provided the updated criteria from Rev. 8 which describes the classification criteria as well as the full text of the GHS purple book for Rev. 8 (Document ID 0065, pp. 129–136). OSHA believes that this provided ample notice for interested parties. No commenter expressed specific concerns about the GHS classification criteria provided in the docket. 
OSHA agrees with commenters that 
including the updates in Rev. 8 to the skin corrosion/irritation chapter would benefit classification and has revised Appendix A.2 in the final rule to align with the updates in Rev. 8. The agency is not including any revisions regarding Category 3 because the agency did not adopt Category 3 in 2012, which is primarily for consumer products, and commenters agreed this decision was appropriate (77 FR 17709). OSHA did not receive any comments suggesting that the agency should adopt Category 3 in this final rule and is not including it in this update. OSHA has also not 
included the guidance material in Rev. 8. 
OSHA will take NIOSH’s concern 
regarding systemic effects into account when updating its classification guidance. The agency also acknowledges ILMA’s concern regarding the additional time required to review the updated criteria. However, OSHA reiterates that the agency is not 
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changing the HCS classification criteria. 
The updates from Rev. 8 provide additional guidance for how to use non- animal test data to classify new chemicals. Inclusion of these updates in the HCS does not require a re-evaluation of chemicals already classified because the overall tiered approach for evaluating existing data has been retained (86 FR 9692). However, OSHA has taken ILMA’s suggestion and extended the compliance deadlines from the timelines in the NPRM (see Summary and Explanation for paragraph (j)). 
In the NPRM, OSHA’s proposed text 
for Appendix A.2 was based on Rev. 7, so the agency’s decision, based on the comments it received, to align with Rev. 8 necessarily entails changes from the proposed text. Thus, many of the sections discussed below are now numbered differently or may be rephrased. Additionally, several new sections have been added. These changes are discussed below in the order in which they appear in Appendix A.2. 
In Appendix A.2, skin corrosion/ 
irritation, Paragraph A.2.1.1 provides updated definitions of skin corrosion and skin irritation, and those definitions are the same in Rev. 7 and Rev. 8. Cal/ OSHA suggested that OSHA should clarify the revised definitions in paragraph A.2.1.1 since the time references were removed from the definition (Document ID 0322, Att. 2, pp. 3–4). As discussed below, OSHA proposed to modify the HCS health hazard definitions to make the definitions more general and to remove the references to the test guidelines. OSHA believes these revisions provide clearer and more concise definitions and a clear differentiation between the ‘‘definitions’’ section and ‘‘general considerations’’ section. Therefore, OSHA has retained the revised definitions of skin corrosion and skin irritation in the final rule. However, in response to Cal/OSHA’s comments, OSHA has modified the final definitions of skin corrosion and skin irritation to include the word ‘‘initial’’ to clarify the time parameters. The updated definitions in the final rule read, ‘‘ Skin 
corrosion refers to the production of 
irreversible damage to the skin; namely, visible necrosis through the epidermis and into the dermis occurring after initial exposure to a substance or mixture’’ and ‘‘Skin irritation refers to the production of reversible damage to the skin occurring after initial exposure to a substance or mixture.’’ Additionally, OSHA has included 
information about the time parameters in A.2.2.2.1.1, A.2.2.2.2.1, and A.2.2.2.2.2. For skin corrosion in 
A.2.2.2.1.1, the agency is adding the word ‘‘initial.’’ For skin irritation in A.2.2.2.2.1, OSHA is including the text ‘‘following its application for up to 4 hours’’ and in A.2.2.2.2.2 is adding the text ‘‘when after the first application’’ to indicate that these provisions refer to a one-time exposure. 
OSHA originally proposed that new 
paragraph A.2.1.2 would clarify the 
sequence in which data should be 
evaluated when classifying for skin corrosion/irritation using a tiered evaluation approach. However, since OSHA is now aligning Appendix A.2 with Rev. 8, it is finalizing language based on Rev. 8’s language in 3.2.1.2, which clarifies that all available and relevant information must be considered when conducting classifications. It also indicates that all classifications must be based on data generated using internationally validated and accepted methods. OSHA believes that the content of its original proposal for A.2.1.2 is adequately clarified in Figure A.2.1 and is not necessary to include in A.2.1.2. Also to align with Rev. 8, OSHA is adding paragraph A.2.1.3, which was not in the text of the proposed rule, to provide information on the tiered approach to classification of skin corrosion/irritation hazards. 
OSHA proposed to revise paragraph 
A.2.2 to present the information in a clearer, more logical fashion but did not propose to change the classification criteria. The text OSHA originally included in the NPRM for this paragraph was based on Rev. 7, but because the agency has decided to align it with Rev. 8, the language and numbering has changed since the proposal. Paragraph A.2.2 contains more information on when to use sub- categories 1A, 1B, and 1C. New paragraphs A.2.2.1 and A.2.2.2 provide information on classification based on standard human data and animal test data, respectively. Paragraph A.2.2.2.1 and subparagraphs A.2.2.2.1.1 and A.2.2.2.1.2, as well as Table A.2.1, provide classification information and criteria for skin corrosion. Skin irritation information and criteria are included in paragraph A.2.2.2.2. 
ACC commented that OSHA should 
retain flexibility in classification and ‘‘avoid an overly prescriptive inclusion 
of Table 3.2.1’’ of Rev. 8. ACC did not 
explain what it might consider an 
‘‘overly prescriptive inclusion of Table 
3.2.1’’ to be. Since ACC expressed 
general support of updating Appendix 
A.2 to expand the use of non-animal test 
methods as outlined in Rev. 8 and 
praised ‘‘the additional flexibility that 
the inclusion of Chapter 3.2 (specifically Table 3.2.1) provides’’ in their 
comments, and since OSHA has not added any requirements for testing or requirements to re-evaluate chemicals already classified, the agency believes its approach to incorporating Rev. 8 changes into Table A.2.1 (which is drawn from Table 3.2.1) would not likely be ‘‘overly prescriptive’’ in ACC’s view (Document ID 0347, p. 6). 
Tom Murphy commented on 
paragraph A.2.2.2.1 (now A.2.2.2.2.1), suggesting that OSHA consider a change from the proposed text ‘‘A substance is irritant to skin when it produces reversible damage to the skin following its application for up to 4 hours’’ to ‘‘A substance is an irritant to the skin when it produces reversible damage to the skin within 4 hours of the initial application’’ (Document ID 0277, p. 1). Murphy reasoned that an improper reading of the proposed wording could lead a reader to misunderstand that the application is constantly applied (rather than applied once and allowed to remain) for up to four hours while observing the subject for reversible damage. 
The language in paragraph A.2.2.2.1 
(now A.2.2.2.2.1), ‘‘for up to 4 hours,’’ is consistent with the language used in the GHS and was taken from the Organisation for Economic Co-operation and Development (OECD) test guidelines, which are widely recognized and accepted around the world. Classifiers are already familiar with the language and the associated test guideline. Therefore, OSHA is maintaining this provision as proposed in the final rule. However, as discussed above, OSHA has updated the definition of skin irritation in A.2.1.1 to include the word initial and paragraph A.2.2.2.1 (now A.2.2.2.2.2) with the additional phrase ‘‘when after the first application’’ for classification for skin irritation (category 2), which should provide the requested clarity. 
OSHA also received comments on 
paragraph A.2.2.2.4 (now A.2.2.2.2.4), which discusses the variability of animal irritant responses within a test. Cal/OSHA commented that the text in the paragraph is not clear (Document ID 0322, Att. 2, p. 4). They asked what OSHA meant by the word ‘‘might,’’ and if the manufacturer or importer is required to act on this information or 
not. They also inquired about the meaning of a ‘‘very elevated mean score,’’ how ‘‘other responses’’ fulfill this criterion, and how this increases ‘‘the sensitivity of the classification system.’’ In response to Cal/OSHA’s comments, OSHA modified the text in the third sentence of paragraph A.2.2.2.2.4 from ‘‘might’’ to ‘‘should’’ to 
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clarify that manufacturers should 
designate a substance as an irritant when at least one of three test animals show a very elevated mean score according to the test method used throughout the study, including lesions persisting at the end of an observation period of normally 14 days. OSHA also modified the text in the fourth sentence, from ‘‘could’’ to ‘‘should’’ to indicate that other irritant responses should also fulfill the same criterion. OSHA notes that the agency did not propose to modify this paragraph, which is in the 2012 HCS as A.2.2.2.2, but the agency believes adopting this change is consistent with the changes made throughout Appendix A to provide clarity. With regard to Cal/OSHA’s questions about other language in A.2.2.2.4, OSHA has provided detailed 
guidance on classification which 
discusses each hazard class. In particular, OSHA has provided 
numerous examples for skin corrosion 
and irritation classification scenarios which provide detailed rationale on applying the classification principles (Document ID 0008, pp. 69–85) and therefore does not believe that the intention of the text is unclear to regulated parties, but will review the guidance to determine if additional material should be added to clarify the terms addressed by Cal/OSHA. 
Table A.2.2 provides the classification 
criteria for skin irritation Category 2. Cal/OSHA asked why the classification criteria indicate that a chemical should be deemed a skin irritant if the criteria are met in Table A.2.2 in at least two animals, rather than one (Document ID 0322, Att. 2, p. 4). OSHA notes that the HCS skin irritation classification criteria align with the current criteria used for classification of skin irritation in the GHS reference tests where irritant responses are present in two of three tested animals. Regardless, to the extent Cal/OSHA seeks a modification in the criteria in Table A.2.2, such changes were not proposed in the NPRM and thus would be beyond the scope of this rulemaking. 
As previously explained, OSHA is 
introducing changes to the final rule which align with Rev. 8. To that end OSHA has added additional paragraphs to Appendix A.2 in the final rule. New paragraph A.2.2.3 provides information on classification based on in vitro/ex vivo data. New paragraph A.2.2.4 provides information on classification based on other existing skin data in animals. New paragraph A.2.2.5 includes information on classification based on chemical properties. New 
paragraph A.2.2.6 includes information on classification based on non-test methods. New paragraph A.2.2.7 
outlines the approach to evaluation of information that should be considered. In addition, Figure A.2.1 was updated to make it consistent with the text and to show the tiered evaluation process. 
PCRM supported adding these 
sections, specifically highlighting the 
revised Figure 3.2.1 and Sections 
3.2.2.3, Classification based on in vitro/ ex vivo data, and 3.2.2.6, Classification based on non-test methods (Document ID 0295, pp. 1–2). 
Cal/OSHA commented that the phrase 
‘‘buffering capacity’’ in paragraph A.2.3.5 is used inconsistently in paragraph A.2.3.5, and is not defined in the chapter, nor is the term ‘‘acid/ alkaline reserve’’ (Document ID 0322, Att. 2, p. 5). Due to the changes made to align with Rev. 8, the content Cal/ OSHA is referring to is now in A.2.2.5. OSHA intends to update some of its existing compliance assistance products following the publication of the final rule and anticipates providing further guidance on acid/alkaline reserve (buffering capacity). 
Paragraph A.2.3 (proposed as A.2.4) 
provides information on classification criteria for mixtures. OSHA had proposed changes to align with Rev. 7, including changes to proposed A.2.4.1.1 and A.2.4.1.2. As with the other classification criteria in A.2, in this final rule OSHA is aligning this section with Rev. 8 instead. Therefore, OSHA is updating A.2.3.1.1 (proposed as A.2.4.1.1) and A.2.3.1.3 (proposed as A.2.4.1.2) and adding a new paragraph A.2.3.1.2. In the new A.2.3.1.1, OSHA is including language stating that the tiered approach specified in Figure A.2.1 must be taken into account when evaluating mixtures. New paragraph A.2.3.1.2 provides information on using in vitro/ex vivo data and limitations regarding applicability domains. The new A.2.3.1.3 is also included to indicate that if there are no other data on the mixture besides pH, and the pH is extreme (pH ≤2 or pH ≥11.5), that 
information is sufficient to classify the mixture as corrosive to the skin. However, if the acid/alkaline reserve suggests that the mixture may not be corrosive despite the extreme pH, then this needs to be confirmed by other data. 
OSHA also proposed to include a new 
note to Table A.2.3, ‘‘Concentration of ingredients of a mixture classified as skin Category 1 or 2 that would trigger classification of the mixture as hazardous to skin (Category 1 or 2),’’ to indicate how to classify the mixture when data are available for sub- categorization of Category 1. The proposed note was to align with the note to Table 3.2.3 in Rev. 7 (Document 
ID 0060, p. 133), in order to provide information OSHA believes will be useful for classifiers. OSHA received no comments on this proposed note, and is finalizing it as proposed except to remove the phrase ‘‘data are available and’’ to align with Rev. 8 as discussed previously (Document ID 0065, p. 136). 
ACC suggested that OSHA consider 
adding Tables 3.2.6 and 3.2.7 from the GHS to either the standard or an updated guidance document (Document ID 0347, p. 6). OSHA anticipates updating some of its guidance products following the publication of the final rule and providing relevant guidance, including the content of Tables 3.2.6, Skin corrosion criteria for in vitro/ex 
vivo methods, and 3.2.7, Skin irritation 
criteria for in vitro methods from Rev. 8, as well as references to NIOSH’s Current Intelligence Bulletin and/or other relevant NIOSH guidance. 
For the reasons discussed above, 
OSHA is finalizing Appendix A.2 to align with Rev. 8 in several respects, including the changes to numbering and wording, and the additional paragraphs described above. 
In Appendix A.3, OSHA proposed 
updates to align with Rev. 7. API supported these changes and noted that they were in alignment with the GHS (Document ID 0316, p. 19). 
OSHA proposed to modify A.3.1.2 to 
clarify the sequence in which data 
should be evaluated when classifying for serious eye damage/eye irritation using a tiered evaluation approach. The proposed revision was to align the language in this paragraph with the tiered approach in Figure A.3.1. The first tier is existing human data, followed by existing animal data, followed by in vitro data, and then other sources of information. OSHA received no comments on this change, and is finalizing it as proposed. 
The changes OSHA proposed in 
paragraphs A.3.2 and A.3.3, including Tables A.3.1 and A.3.2, are mainly editorial in nature. The classification criteria in these paragraphs would remain the same, but the proposed revisions rearrange the presentation of the information and include additional headings to provide a clearer, more logical sequence. All of the proposed changes were to conform with Rev. 7 (Document ID 0060, pp. 139–145). 
OSHA proposed a new paragraph 
A.3.2 to provide a summary of the classification criteria for substances that is provided in Tables A.3.1 and A.3.2. Paragraph A.3.2.3 of the 2012 HCS (now renumbered as A.3.2.1.3) provided that if there is pronounced variability among animal responses, that information 
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‘‘may be taken into account’’ when 
determining the classification. Worksafe and Cal/OSHA commented that the language in the 2012 HCS would allow producers to withhold evidence of a serious health effect in toxicological studies if the effect occurs among a range of other effects (Document ID 0354, p. 4; 0322, Att. 1, p. 3). While Worksafe and Cal/OSHA incorrectly suggest that this is a new problem with the language, since the word ‘‘may’’ was already in the 2012 HCS, OSHA agrees with these comments and has concluded that making a change would be consistent with the editorial and clarifying nature of the edits OSHA proposed for A.3.2 and A.3.3 and the broader goal of this update to Appendix A to clarify which elements are mandatory. The agency has therefore 
revised proposed paragraph A.3.2.1.3 in 
the final rule to indicate that the provision is mandatory and that 
information on pronounced variability 
‘‘must’’ be taken into account when making classification decisions. 
OSHA received a comment from Cal/ 
OSHA asking why two out of three test animals are required for category 1(b) while only one positive test is required in (a). Additionally, they stated the text in the table is unclear about the meaning of irreversible effects (Document ID 0322, p. 5). While OSHA proposed to modify the title and added a footnote to Table A.3.1, OSHA did not propose to modify the actual criteria and they remain consistent with the GHS. Therefore, this comment is outside the scope of this rulemaking. 
OSHA proposed a new paragraph 
A.3.3.6 (now A.3.2.2.6 in the final rule) as a reorganization of the 2012 HCS paragraphs A.3.3.3 and A.3.3.4. Proposed paragraph A.3.3.6 (now A.3.2.2.6) was to provide guidance on using the tiered approach and making weight-of-evidence decisions, and also to indicate OSHA’s preference for not conducting new animal tests. OSHA received no comments on proposed paragraph A.3.3.6 (now A.3.2.2.6), and is therefore finalizing it as proposed. 
OSHA proposed to modify Figure 
A.3.1 to align with the tiered evaluation scheme in Figure 3.3.1 of Rev. 7 (Document ID 0060, p. 142). Under OSHA’s proposed revisions, Figure A.3.1, ‘‘Tiered Evaluation for serious 
eye damage and eye irritation’’ (previously titled ‘‘Evaluation strategy for serious eye damage and eye irritation’’ in the 2012 HCS), would remain largely the same. However, as in Figure A.2.1, OSHA proposed to revise Steps 1a, 1b, and 1c to clarify that the parameter being evaluated is existing human or animal serious eye damage/ eye irritation data. In addition, OSHA 
proposed to modify the finding in Step 4 to clarify that high acid/alkaline reserve or no data for acid/alkaline reserve should be considered when the pH is ≤2 or ≥11.5. OSHA also proposed modifications to the footnotes of Figure A.3.1 to reflect the most recent test methods. Specifically: 
•OSHA proposed to include two 
additional sentences in footnote c (previously footnote (3)) that emphasizes that expert judgement should be exercised when making determinations from existing animal data indicating serious eye damage/eye irritation, as not all skin irritants are eye irritants. 
•OSHA proposed to include OECD 
Test Guideline 460 (Fluorescein leakage (FL)) in footnote d (previously footnote (4)) as an additional example of an internationally accepted, scientifically validated test method for identifying eye corrosives and severe irritants. OSHA also proposed an additional sentence for this footnote to indicate that there are presently no scientifically validated and internationally accepted in vitro test 
methods for identifying eye irritation. 
•OSHA proposed to revise footnote f 
(previously footnote (6)) to make it clear 
that all available information on a substance must (instead of should) be 
considered in making a determination based on the total weight of evidence. In addition, OSHA proposed to remove the last two sentences at the end of footnote f and add a new sentence indicating that negative results from applicable scientifically validated in vitro tests are 
considered in the total weight of evidence evaluation. 
PCRM supported updating the 
footnotes for Figure A.3.1 (Document ID 0295, p. 2). OSHA received no other comments on the changes to Figure 
A.3.1 and is therefore finalizing them as 
proposed. 
In proposed paragraph A.3.4 (now 
A.3.3 in the final rule), OSHA proposed several minor editorial changes to 
ensure consistency in the terminology 
used. For example, OSHA proposed to use the term ‘‘serious eye damage’’ (rather than ‘‘eye corrosion’’) throughout the text to reflect the name of the hazard class. OSHA received no comments on these revisions and is therefore finalizing them as proposed. 
For the reasons discussed above, 
OSHA is finalizing the entirety of A.3 as proposed, except for changing ‘‘may’’ to ‘‘must’’ in A.3.2.3 and renumbering some of the paragraphs to better align with the GHS. IV. Respiratory or Skin Sensitization (Appendix A.4) 
OSHA proposed a small number of 
primarily editorial changes in Appendix 
A.4, Respiratory or Skin Sensitization. It received no comments on those changes, but did receive an out of scope comment on this section. 
Cal/OSHA commented that in 
paragraph A.4.2.1.3.1, ‘‘[t]he proposal 
requires disclosure of chemical asthmagens that cause respiratory sensitization, but does not require disclosure of chemicals that produce bronchospasm without a sensitization (immune) effect, also known as reactive airway dysfunction syndrome (RADS), or acute-onset, irritant induced asthma (IIA)’’ (Document ID 0322, Att. 1, pp. 17–18). Cal/OSHA therefore recommended adding a category 1C to this hazard class (Document ID 0322, Att. 2, p. 6). OSHA notes that the agency did not propose to modify paragraph A.4.2.1.3.1, therefore, Cal/OSHA’s proposal is outside the scope of this rulemaking. Additionally, as stated above, OSHA has provided considerable guidance on each hazard category under its Hazard Classification guidance (Document ID 0008). In this case, OSHA’s classification guidance covers organ dysfunction, such as RADS, under the hazard classes STOT–SE and STOT– RE (Document ID 0008, pp. 192, 213). 
V. Germ Cell Mutagenicity (Appendix 
A.5) 
As discussed below, OSHA proposed 
to add a definition for germ cell mutagenicity in A.5.1.1. Because of this new paragraph, OSHA also proposed adjusting the subsequent numbering of existing paragraphs in A.5.1. OSHA received no comments on these changes and is finalizing them as proposed. 
In A.5.4, Examples of scientifically 
validated test methods, paragraph A.5.4.2, OSHA proposed to delete the Mouse spot test (OECD 484) as an example of an in vivo somatic cell mutagenicity test, as it was deleted by the OECD on April 2, 2014. The proposed change was to align with Rev. 7 (Document ID 0060, p. 163) and to ensure that hazard classifications are being conducted with the most current scientific principles. OSHA received no comments on this revision and is therefore finalizing it as proposed. 
Toby Threet stated that Figure A.5.1 
‘‘should not place all human epidemiological studies on an equal footing. Sometimes an epidemiological study, by itself, is not sufficient to establish that a chemical is a known human germ cell mutagen’’ and proposed modified text (Document ID 
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0279, p 16). OSHA did not propose to 
modify Figure A.5.1; therefore, the proposed revision is out of scope for this rulemaking and OSHA declines to change the text as requested. 
VI. Carcinogenicity (Appendix A.6) 
Paragraph A.6.4.2 indicates that when 
OSHA has identified a chemical as a 
carcinogen in 29 CFR part 1910, subpart Z, Toxic and Hazardous Substances, that chemical must be classified as a carcinogen for purposes of the HCS (for instance, the respirable crystalline silica standard references the HCS and silica being a carcinogen in 29 CFR 1910.1053(j)(1)). OSHA proposed to strike the specific citation to 29 CFR part 1910, subpart Z, Toxic and Hazardous Substances, and replace it with the text ‘‘this section subpart.’’ Toby Threet and the Vinyl Institute stated that the proposed text was unclear, and the Vinyl Institute commented that the reason for the revision was vague (Document ID 0279, p. 17; 0369, p. 10). OSHA included the text ‘‘section subpart’’ in error in the NPRM. The proposed text should have replaced the citation to 29 CFR part 1910, subpart Z, Toxic and Hazardous Substances with the text ‘‘this subpart.’’ However, OSHA agrees with these comments and is retaining the original text for clarity. 
Cal/HESIS, Cal/OSHA, Worksafe, 
National COSH, and Steve Wodka commented that manufacturers should be required to classify chemicals as carcinogens and provide carcinogenicity information when the chemical is listed as a carcinogen by authoritative organizations. Cal/HESIS specified these should include ‘‘the NTP, the IARC, the EPA, and OSHA when OSHA has included cancer as a health hazard to be considered by classifiers for the chemical under 29 CFR part 1910, subpart Z, Toxic and Hazardous Substances’’ (Document ID 0313, pp. 6– 7). Some of these commenters provided suggested text for paragraph A.6.4 (Document ID 0313, pp. 6–7; 0312, p. 6; 0322, Att. 1, pp. 5–7; 0354, pp. 5–6; 0407, p. 15). OSHA did not propose to modify the paragraphs that Cal/HESIS proposed revisions to (except to use the 
term ‘‘of this subpart’’ in A.6.4, which is unrelated to this issue). Therefore, the suggested revisions are out of scope for this rulemaking and OSHA declines to make those changes. Furthermore, OSHA provides ample guidance in both Appendix F, which includes a table on how to classify carcinogens based on NTP and the International Agency for Research on Cancer (IARC) classifications, and Appendix C of the compliance directive (Document ID 0007, p. 103) which OSHA anticipates 
updating after issuing this final rule. 
Cal/HESIS also commented that 
OSHA should ‘‘allow State Plan States such as California to require manufacturers that sell chemicals in their states or territories to classify chemicals as carcinogens or as having reproductive toxicity or developmental toxicity when the chemicals are listed by a state- or territory-specific body. . . as carcinogens or as reproductive or 
developmental toxicants’’ (Document ID 
0313, p. 8). This issue is outside the scope of this rulemaking as OSHA proposed nothing related to this issue in the NPRM. However, OSHA notes that it has already addressed the issue of labeling of hazardous chemicals in its 1997 approval of the California State Standard on Hazard Communication Incorporating Proposition 65 (Prop 65) (62 FR 31159). 
VII. Reproductive Toxicity (Appendix 
A.7) 
In Appendix A.7, OSHA proposed to 
revise the ‘‘effects on or via lactation’’ hazard category classification criteria in Figure A.7.1(b) to align with OSHA’s Hazard Classification guidance (Document 0008, p. 172). During the development of the Hazard Classification guidance document, it became apparent to OSHA that there were issues with regard to the classification criteria in Figure A.7.1(b). The hazard category for effects on or via lactation captures two separate effects: (1) substances that can interfere with lactation and (2) substances and their metabolites that may be transmitted through breast milk to children in amounts sufficient to cause concern for the health of the breastfeeding child. However, the criteria in effect at that time did not adequately distinguish between these two separate effects. OSHA therefore proposed to delete the 
text ‘‘hazardous to breastfed babies’’ in the second sentence in Figure A.7.1(b), which was not grammatical and excluded the effects on lactation. OSHA also proposed to modify the third 
sentence in the figure to read: 
‘‘Classification for effects via lactation 
shall be assigned on the basis of:’’ in 
order to avoid confusion on how to 
apply the criteria for effects on lactation. 
These proposed changes would not affect the classification of substances or mixtures as reproductive toxicants. OSHA received no comments on this revision and is therefore finalizing it as proposed. 
OSHA also proposed to modify 
paragraph A.7.2.5.1 to include OECD Test Guideline 443, Extended One Generation Reproductive Toxicity Study, as an additional method for one 
or two generation toxicity testing. Additionally, in Table A.7.1 ‘‘Cut-off values/concentration limits of ingredients of a mixture classified as reproductive toxicants or for effects on or via lactation that trigger classification of the mixture,’’ OSHA proposed a correction to the top left heading from ‘‘ingredients classified as’’ to ‘‘ingredient classified as.’’ OSHA explained in the NPRM that the use of the word ‘‘ingredients’’ in this context could be confusing, as it could suggest that the additivity principle should be applied. Therefore, OSHA proposed this change for clarity. These proposed modifications in Appendix A.7 were to align with Rev. 7 (Document ID 0060, pp. 185–187). OSHA received one comment from PCRM in support of the addition of OECD TG 443, and no comments objecting to its addition. OSHA is therefore finalizing these changes as proposed. 
Cal/HESIS commented that OSHA 
should add a requirement that manufacturers refer to authoritative organizations when classifying chemicals that have reproductive toxicity as follows: ‘‘Manufacturers classifying chemicals shall treat the following source as establishing that a substance is a reproductive or developmental toxicant for hazard communication purposes in lieu of applying the criteria described herein: 1. Reproductive or developmental toxicants identified in the Monographs on the Potential Human Reproductive and Developmental Effects, National Toxicology Program, Office of Health Assessment and Translation’’ (Document ID 0313, p. 6). OSHA did not propose any modifications to the classification criteria in Appendix A.7 related to authoritative organizations when classifying chemicals that have reproductive toxicity, therefore, Cal/ HESIS’s comment is therefore outside the scope of this rulemaking and OSHA declines to accept their proposal. 
VIII. Specific Target Organ Toxicity 
Single Exposure (Appendix A.8) 
In addition to non-substantive 
changes in A.8.1.6 and A.8.2.1.7.3, 
OSHA proposed adding new paragraph A.8.3.4.6 to include the concept of ‘‘relevant ingredient’’ when classifying mixtures containing Category 3 ingredients using the additivity approach. Under the 2012 HCS, the additivity principle was introduced in paragraph A.8.3.4.5. However, a ‘‘relevant ingredient’’ for this procedure had not been established. OSHA therefore proposed paragraph A.8.3.4.6 to provide that in cases where the 
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additivity approach is used for Category 
3 ingredients, the ‘‘relevant ingredients’’ of a mixture are those which are present in concentrations ≥ one percent (w/w 
for solids, liquids, dusts, mists, and vapors and v/v for gases), unless there is a reason to suspect that an ingredient present at a concentration < one percent is still relevant when classifying the mixture for respiratory tract irritation or narcotic effects. This proposed paragraph would align with Rev. 7 (Document ID 0060, p. 198). OSHA received no comments on these revisions and is finalizing them as proposed. 
OSHA received a comment from Toby 
Threet arguing that in Tables A.8.1, A.9.1, A.9.2, and paragraph A.8.3.4.6, the use of the words ‘‘gas,’’ ‘‘vapor,’’ and ‘‘mist’’ as three distinct categories is scientifically incorrect and that either ‘‘gas’’ and ‘‘vapor’’ are synonymous or ‘‘vapor’’ and ‘‘mist’’ are synonymous, depending on OSHA’s intended meaning of ‘‘vapor.’’ Threet suggested that OSHA modify these sections to only have two categories (Document ID 0279, p. 17). OSHA notes that the agency did not propose to modify the use of these three terms in Tables A.8.1, A.9.1, or A.9.2 or how those terms are used more generally in the HCS, and A.8.3.4.6, while new, reflects that underlying concept. Therefore, such changes would be out of scope for this rulemaking. OSHA notes that its Hazard Classification guidance provides substantial guidance and examples regarding how to apply the hazard criteria to vapors, mists, and gases (Document ID 0008, pp. 189–226). 
IX. Specific Target Organ Toxicity 
Repeated or Prolonged Exposure (Appendix A.9) 
OSHA made a few changes to 
Appendix A.9 that are discussed below in the section on broader changes made throughout Appendix A. OSHA received one comment on Appendix A.9 unrelated to its proposed changes. Cal/ HESIS commented that OSHA should add the following requirement: ‘‘For chemicals that affect the nervous system, manufacturers shall treat the following sources as establishing that a 
substance is a neurotoxicant for hazard communication purposes in lieu of applying the criteria described herein: 1. Agency for Toxic Substances and Disease Registry (ATSDR), Health Effects of Toxic Substances and Carcinogens, Nervous System. 2. Chemicals for which a reference dose or concentration has been developed based on neurotoxicity in the United States Environmental Protection Agency’s Integrated Risk Information System database (searching for ‘‘Organ/System affected: Nervous’’)’’ (Document ID 0313, pp. 7–8). While OSHA agrees that these sources are relevant and the classifiers can rely on this information for classification purposes, OSHA did not propose to modify the classification criteria in Appendix A.9 to include a requirement that manufacturers refer to 
authoritative organizations when 
classifying chemicals that have specific target organ toxicity, therefore, it is outside the scope of this rulemaking to modify Appendix A.9 as suggested by Cal/HESIS. 
X. Aspiration Hazard (Appendix A.10) 
OSHA proposed changes to Appendix 
A.10 to clarify the classification criteria 
for mixtures when data are available for all ingredients or only for some ingredients and to align with Rev. 7 (Document ID 0060, p. 213). OSHA proposed new paragraph A.10.3.3.1 to clarify that the concept of ‘‘relevant ingredient’’ applies and that relevant ingredients are those that are present in concentrations of at least 1%. In addition, OSHA proposed a new heading, ‘‘Category 1,’’ as new paragraph A.10.3.3.2. and proposed paragraphs A.10.3.3.2.1 and A.10.3.3.2.2 to clarify that the principle of additivity applies in Appendix A.10. OSHA did not propose any substantive changes to the classification criteria. ILMA commented in support of the changes in A.10.3.3, stating that the clarifications provided ‘‘will assist ILMA members (many of whom compound and market low-viscosity petroleum product mixtures) in properly classifying their products for aspiration toxicity’’ (Document ID 0356, p, 6). OSHA received no objections to the changes and is finalizing them as proposed. 
XI. Changes to Definitions and 
Terminology, Clarification of Mandatory Requirements, and Corrections 
(A) Definitions 
OSHA proposed to update Appendix 
A to include changes to the health 
hazard definitions to reflect those 
adopted in Rev. 7 (Document ID 0060; 
0131). In the time since OSHA revised 
the HCS in 2012, the UNSCEGHS 
revised all of the health hazard 
definitions in the GHS. The previous 
health hazard definitions were not consistent with respect to form or content, and many of the definitions were taken directly from the OECD test guidelines. 
The UNSCEGHS determined that the 
definitions should be more general and neutral with respect to test guidelines and that test guideline criteria should not be part of a definition. The group 
also determined that the health hazard definitions should be clear and concise and that there should be a clear differentiation between ‘‘definitions’’ and ‘‘general considerations’’ text. OSHA proposed to adopt all the revised health hazard definitions from Rev. 7 in Appendix A, as well as corresponding 
changes to text throughout the appendix. For example, in some cases OSHA proposed to remove OECD test guidelines from definitions and to move them to paragraphs outlining classification criteria. OSHA has discussed in the respective sections above the definition changes that had substantive impacts on the rest of their hazard classifications and has made alterations to some of the proposed definitions. These health hazard definitions are the definitions that OSHA is finalizing in Appendix A: 
•Acute toxicity refers to serious 
adverse health effects ( i.e., lethality) 
occurring after a single or short-term oral, dermal, or inhalation exposure to a substance or mixture. 
•Skin corrosion refers to the 
production of irreversible damage to the skin; namely, visible necrosis through the epidermis and into the dermis occurring after initial exposure to a substance or mixture. 
•Skin irritation refers to the 
production of reversible damage to the skin occurring after initial exposure to a substance or mixture. 
•Serious eye damage refers to the 
production of tissue damage in the eye, or serious physical decay of vision, which is not fully reversible, occurring after exposure of the eye to a substance or mixture. 
•Eye irritation refers to the 
production of changes in the eye, which are fully reversible, occurring after exposure of the eye to a substance or mixture. 
•Respiratory sensitization refers to 
hypersensitivity of the airways occurring after inhalation of a substance or mixture. 
•Skin sensitization refers to an 
allergic response occurring after skin contact with a substance or mixture. 
•Germ cell mutagenicity refers to 
heritable gene mutations, including heritable structural and numerical chromosome aberrations in germ cells occurring after exposure to a substance or mixture. 
•Carcinogenicity refers to the 
induction of cancer or an increase in the incidence of cancer occurring after exposure to a substance or mixture. Substances and mixtures which have induced benign and malignant tumors in well-performed experimental studies 
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on animals are considered also to be 
presumed or suspected human carcinogens unless there is strong evidence that the mechanism of tumor formation is not relevant for humans. 
•Reproductive toxicity refers to 
adverse effects on sexual function and fertility in adult males and females, as well as developmental toxicity in the offspring, occurring after exposure to a substance or mixture. Some reproductive toxic effects cannot be clearly assigned to either impairment of sexual function and fertility or to developmental toxicity. Nonetheless, substances and mixtures with these effects shall be classified as reproductive toxicants. 
•Specific target organ toxicity— 
single exposure (STOT–SE) refers to 
specific, non-lethal toxic effects on target organs occurring after a single exposure to a substance or mixture. All significant health effects that can impair function, both reversible and irreversible, immediate and/or delayed and not specifically addressed in A.1 to A.7 and A.10 of this Appendix are included. Specific target organ toxicity following repeated exposure is classified in accordance with SPECIFIC 
TARGET ORGAN TOXICITY— REPEATED EXPOSURE (A.9 of this 
Appendix) and is therefore not included here. 
•Specific target organ toxicity— 
repeated exposure (STOT–RE) refers to 
specific toxic effects on target organs 
occurring after repeated exposure to a substance or mixture. All significant health effects that can impair function, both reversible and irreversible, immediate and/or delayed and not specifically addressed in A.1 to A.7 and A.10 of this Appendix are included. Specific target organ toxicity following a single-event exposure is classified in accordance with SPECIFIC TARGET 
ORGAN TOXICITY—SINGLE EXPOSURE (A.8 of this Appendix) and 
is therefore not included here. 
•Aspiration hazard refers to severe 
acute effects such as chemical pneumonia, pulmonary injury or death occurring after aspiration of a substance or mixture. 
•Aspiration means the entry of a 
liquid or solid chemical directly through the oral or nasal cavity, or indirectly from vomiting, into the trachea and lower respiratory system. 
NAIMA and API commented in 
support of the proposed modifications to the health hazard definitions (Document ID 0338, p. 7; 0316, p. 12). OSHA received comments on some of the specific definitions, which are addressed in their respective sections (including acute toxicity, skin corrosion, and skin irritation definitions) and the 
definitions listed above include any 
responsive modifications OSHA decided to make based on those comments. OSHA received no objections to the changes to the serious 
eye damage, eye irritation, respiratory sensitization, skin sensitization, germ cell mutagenicity, carcinogenicity, reproductive toxicity, STOT–SE, and 
STOT–RE definitions, and is therefore 
finalizing these definitions as proposed. 
(B) Terminology Issues 
The 2012 HCS was somewhat 
inconsistent in the way the terms 
‘‘hazard category’’ and ‘‘toxicity category’’ were used throughout Appendix A. In some cases, the terms were used interchangeably, while in other instances the terms were intended to have different meanings. OSHA therefore proposed revisions to ensure that these terms are used appropriately 
and consistently. As such, OSHA proposed to delete the term ‘‘toxicity category’’ and replace it with ‘‘hazard category’’ in various places, including paragraphs A.0.5, A.1, A.3, A.8, A.9, and A.10. These proposed changes also align with Rev. 7 (Document ID 0060; 0084). OSHA received no comments on these changes and is finalizing them as proposed. 
(A) Mandatory Language 
OSHA proposed to update a number 
of provisions in Appendix A to make it 
clear that those provisions are mandatory. For example, OSHA proposed to change the term ‘‘should’’ to ‘‘must’’ in paragraph A.3.4.3.3 (now paragraph A.3.3.3.3) to clarify that the cut-off value/concentrations in Table A.3.3 are mandatory when determining if a mixture must be classified as 
seriously damaging to the eye or an eye 
irritant. OSHA received no comments on these changes and is finalizing them as proposed. 
(B) Corrections 
OSHA proposed to correct a few 
errors that currently exist in the HCS. 
OSHA erroneously did not include Appendix A.4, respiratory or skin sensitization, in the list of health hazards referenced in the ‘‘concentration of mixtures’’ paragraph at A.0.5.1.3 of the 2012 HCS. OSHA therefore proposed to add a reference to Appendix A.4 in paragraph A.0.5.1.3 to clarify that the concentration of mixtures bridging principle applies to respiratory and skin sensitization. Similarly, Appendix A.4 was also erroneously excluded from the list of health hazards referenced in the ‘‘interpolation within one toxicity category’’ paragraph at A.0.5.1.4 of the 
2012 HCS. Thus, OSHA also proposed to add a reference to Appendix A.4 in paragraph A.0.5.1.4 to clarify that the interpolation bridging principle applies to respiratory and skin sensitization. OSHA received no comments on these changes and is finalizing them as proposed. 
D. Appendix B 
Appendix B addresses the physical 
hazards covered by the HCS, including 
classification criteria consistent with the GHS. OSHA proposed several substantive updates to Appendix B, including the addition of a new hazard class (desensitized explosives) and several new hazard categories (splitting Category 1 into 1A and 1B and further subdividing Category 1A into flammable gases, chemically unstable gases and pyrophoric gases in the Flammable Gases class, as well as nonflammable aerosols in the Aerosols class), revisions to the consensus standards and testing methods referenced in Appendix B, and clarifications based on implementation issues that arose from the 2012 HCS. 
OSHA proposed to include the new 
hazard class and hazard categories because, since the HCS aligned with the GHS in 2012, new physical hazard classes or hazard categories have been added to Rev. 7 which better identify and communicate hazard information to downstream workers (Document ID 0060). OSHA proposed to adopt those additions to maintain alignment with the GHS. As explained in the NPRM and in the discussion to follow on individual classes within Appendix B, OSHA preliminarily determined that the addition of these specific hazard classes and categories would better differentiate between the hazards and better communicate hazards on labels for downstream users by using more targeted hazard statements, 
precautionary statements, and pictograms. 
In order to maintain alignment with 
Rev. 7 (Document ID 0060), OSHA also proposed several updates to references to consensus standards and testing methods. Although the HCS does not require testing and permits classifiers to use data from literature or experience for classification purposes, OSHA proposed to update consensus standards and testing methods referenced in Appendix B in accordance with Rev. 7 to ensure that data considered for classification incorporate updated scientific principles. OSHA is not, however, implying that data obtained from the older methods would no longer be valid or that classifiers would need to retest or reclassify chemicals due to 
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these updated methods. Third, OSHA 
proposed certain corrections and clarifications to Appendix B to address (1) previous inadvertent omissions from the GHS or the HCS; (2) changes made to the GHS to improve clarity or technical accuracy; and (3) how some hazard classes should be evaluated in light of the addition of new hazard classes in the GHS. These changes, discussed further below, were proposed to align the HCS with the GHS while improving the classification and communication of hazards and maintaining or enhancing worker safety and health. As noted elsewhere in this preamble, OSHA has determined that primarily aligning the HCS with Rev. 7 will not only improve safety and health but will also ease compliance burdens for U.S. stakeholders that must also 
comply with international requirements 
for hazard classification and communication. 
OSHA also proposed to make several 
changes to Appendix B to clarify compliance requirements. These changes arose from the agency’s experience with implementing the HCS and are expected to maintain existing safety and health protections while easing or having no effect on the compliance burdens for regulated entities. They are described in more detail in the discussions below on individual classes within Appendix B. 
Finally, OSHA provided a redline 
strike out version of Appendix B, which reflected all of OSHA’s proposed revisions, in the docket and on the OSHA website to allow interested parties to view all of the proposed changes in context (Document ID 0222). OSHA will update this document to show the changes being made in this final rule and strongly encourages stakeholders to review that document in 
conjunction with the discussion of the revisions, as the discussion provided in this final rule’s summary and explanation does not fully describe all of the non-substantive or editorial changes OSHA is making in Appendix B. Stakeholders can examine the redline strikeout of the regulatory text (changes from 2012 HCS to this final rule) at OSHA’s HCS web page ( https://
www.osha.gov/dsg/hazcom/) to view all of the changes from the 2012 HCS made in this final rule. 
I. Explosives (Appendix B.1) 
OSHA proposed several minor 
amendments to Appendix B.1. First, 
OSHA proposed a clarification to the classification criteria for Division 1.6 explosives in B.1.2 (f). Under Rev. 3, one of the criteria for classification of an article (OSHA uses the term ‘‘item’’ in the HCS) as a Division 1.6 explosive is 
that it contains ‘‘only’’ extremely insensitive detonating chemicals (Document ID 0085, Att. 2, p. 4). Rev. 7 (Document ID 0060, p. 44) states that the criteria are met if the article (‘‘item’’ in the HCS) ‘‘predominantly’’ contains extremely insensitive detonating chemicals. OSHA proposed to make the same change to paragraph B.1.2 (f) of 
Appendix B on the basis that changing 
the criteria from containing ‘‘only’’ extremely insensitive detonating chemicals to ‘‘predominantly’’ containing extremely insensitive detonating chemicals would be more technically accurate and better align with the guidance in test series 7 in the UN Manual of Tests and Criteria (Document ID 0151). It would also reduce confusion for chemical manufacturers or importers when classifying explosives. OSHA did not receive any comments on this change and is finalizing it as proposed. 
OSHA also proposed to add two notes 
from the GHS (Document ID 0060, pp. 44–45) to Appendix B, paragraph B.1.3.1, that are related to the addition of the desensitized explosives hazards class (Appendix B.17, newly added in this final rule and discussed later in this document). The first new note OSHA proposed to add (Note 2) provides an explanation that explosives for which explosive properties have been suppressed or reduced by being wetted with water or alcohols, diluted with other substances, or dissolved or suspended in water or other liquid substances must be classified as desensitized explosives. 
The second new note OSHA proposed 
(Note 3) explains that some chemicals that are exempt from classification as explosives under UN Recommendations on the Transport of Dangerous Goods guidelines still have explosive properties, which must be communicated in Section 2 (Hazard identification) and Section 9 (Physical and chemical properties) of the SDS, as appropriate. OSHA proposed that the notes would be incorporated in the HCS with edits to change these provisions from recommendations in the GHS to requirements in the HCS ( e.g., ‘‘may be 
a candidate for classification as’’ in the GHS would be revised to ‘‘shall be 
classified as’’ in the HCS) and to revise the GHS terminology to terminology more appropriate for the HCS ( e.g., 
‘‘substances and mixtures’’ in the GHS would be revised to ‘‘chemicals’’ in the HCS). 
OSHA received comments on 
proposed Note 2 from DOD. DOD stated that ‘‘The techniques cited in 
B.1.3.1. . .do not necessarily ‘suppress or reduce explosive properties’ as 
indicated within NOTE 2. Instead, those techniques simply result in sensitivity suppression or reduction by homogeneously dispersing certain concerning molecules amongst other inert molecules, which is why the resultant chemicals are known as ‘desensitized explosives’ ’’ (Document ID 0299, p. 3). DOD recommended that OSHA change the first sentence of Note 2 to read: ‘‘Some explosive chemicals are wetted with water or alcohols, diluted with other substances, or dissolved or suspended in water or other liquid substances, to suppress or reduce their explosive properties or sensitivity’’ (Document ID 0299, p. 3; emphasis added). 
OSHA believes the language proposed 
in the NPRM captured the idea of a reduction of sensitivity in the phrase ‘‘suppress or reduce their explosive properties.’’ However, to ensure clarity, OSHA has added the term ‘‘sensitivity’’ at the end of the first sentence of Note 2 as DOD requested. 
DOD additionally recommended that 
OSHA should address the concept of desensitizing an explosive by mixing it with an inert solid ( e.g., silica) in Note 
2 (Document ID 0299, p. 3). OSHA does not agree that this addition is necessary. The primary purpose of this note is to alert the classifier that a mixture may be a desensitized explosive and that they should consider this in their classification process. The note is not intended to give guidance on how to dilute an explosive to become desensitized or list every mechanism by which such desensitization can be achieved. OSHA notes that mixing explosives with solids is not excluded from this note because it includes the phrase ‘‘diluted with other substances.’’ Additionally, this wording matches the wording in Rev. 7, which is reflected in both this proposed note and proposed Section B.17, Desensitized Explosives. Furthermore, OSHA notes that the addition of solids to explosive chemicals is not an unequivocal abatement of the explosive hazard nor does it automatically create a desensitized explosive. Under certain circumstances such an addition would be a new mixture that may need to be reevaluated to determine whether it is 
an explosive or desensitized explosive. OSHA does not want to suggest that solids can in all cases be used to create a desensitized explosive. Thus, OSHA is not adding the suggested edits by DOD but anticipates providing additional information on this issue as it updates its classification guidance. 
DOD provided two suggestions for 
Note 3. First, DOD noted that there is an 
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error in OSHA’s citation of the is UN 
Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria and that it should be to UN ST/ SG/AC.10/11/Rev.6 instead of UN ST/ SG AC.10/30/Rev.6. Second, DOD recommended that OSHA add the phrase ‘‘which are exempted from classification as explosives (based on a negative result in Test Series 6 in Part I, Section 16, of UN ST/SG/AC.10/11/ Rev.6)’’ (Document ID 0299, pp. 3–4). OSHA agrees with both suggested revisions and notes that DOD’s second recommended change is in the Rev. 7 note which OSHA’s Note 3 was based on (Document ID 0060, p. 45, Note 2 under table 2.1.2). Therefore, OSHA is updating Note 3 as recommended by DOD. 
OSHA received several comments 
from SAAMI. First, SAAMI commented that, similar to OSHA’s approach to changes from Rev. 8 of the GHS, OSHA should provide an option in the final rule for industry to change over to Rev. 9 for GHS chapter 2.1 (Document ID 0370, p. 2). However, unlike the changes in Rev. 8, OSHA did not propose or raise as an issue the potential to adopt Rev. 9 updates to chapter 2.1 in this final rule. OSHA does not believe there has been sufficient notice and comment to make such sweeping changes to this final rule. However, while OSHA is not making a finding in this rulemaking that this will be the case for every explosive, OSHA believes that under many circumstances following the Rev. 9 update to chapter 2.1 will result in full compliance with the requirements of the HCS, and manufacturers, importers, and distributors can determine whether in a given case following Rev. 9 would also comply with the HCS. 
OSHA’s conclusion is based on 
several factors unique to explosives. First, OSHA notes that following Rev. 9 would meet the HCS requirement to not use updated classification criteria from subsequent GHS revisions. As illustrated by SAAMI’s comparison spreadsheet (Document ID 0294, Att. 2), which OSHA has reviewed and concluded is accurate, the same TDG classification criteria are used. The categories are simply called different names (e.g., Divisions 1.1–1.3 and 1.5 
are now called 2A, Division 1.4 is called 2B or 2C) and are regrouped to better break down the classification into low, medium, and high hazards when outside of the packaging. A label preparer could follow all of the classification instructions in Appendix B and simply call it a different category name as a result, which would not 
confuse workers because the category name is not used on labels. Second, explosives have unique 
flexibility under Appendix C with regard to the language used on labels compared to other hazards and the labeling language in Rev. 9 is generally quite similar to the language used in Rev. 7. Specifically, in Appendix C, in the note under C.4.14, if a label preparer determines that an unpackaged or repackaged explosive corresponds to a 
hazard category other than Division 1.1, 
OSHA allows the use of the corresponding symbol (i.e., pictogram), 
signal word, and/or hazard statement. Since labels are attached to the immediate container, which would be exposed when explosives are unpackaged or repackaged, OSHA believes that it is often appropriate to use this flexibility on HCS labels for explosives. OSHA therefore believes that this provision, in combination with the usual flexibilities regarding hazard statements under C.2.2.1 and C.2.2.2, can allow the label preparer to determine, on a case-by-case basis, that the hazard statements in Chapter 2.1 of Rev. 9 are appropriate. Similarly, because deviations in precautionary statements between Rev. 7 and Rev. 9 are infrequent and usually small, OSHA believes that the labeling flexibility under C.2.4 would allow for the use of precautionary phrases from Rev. 9. OSHA would allow deviations in labeling language, for both hazard statements and precautionary statements, if the label preparer can show that based on their analysis of the explosive the label elements in Rev. 9 are more appropriate and therefore would be in full compliance with the HCS (see Appendix C, C.2.2.2 and renumbered C.2.4.9). The hazard statements, pictograms and signal words for explosives in Rev. 9 are all at least as protective as the Rev. 7 elements that OSHA proposed to include in the updated HCS, except for the low hazard explosives (Category 2C, which corresponds to explosive 1.4S in Rev. 7 and the HCS) where an exclamation mark pictogram is used instead of an exploding bomb (Document ID 0294, Att. 2). While there is no general flexibility regarding pictograms in C.2.3, 
in Appendix C, Category 1.4S small 
arms and ammunition are specifically 
exempted from the requirement to 
include a pictogram, meaning that the pictogram requirements in the HCS and Rev. 9 are not in conflict. 
Considering all of the flexibilities 
outlined above, OSHA concludes that a label preparer may, on a case-by-case basis, determine that using the label elements prescribed in Rev. 9 for labeling explosives would be in compliance with the HCS. OSHA also 
believes that this could help harmonize labeling since Rev. 9 categorization gives labelers a clearer path forward to an appropriate labeling scheme where explosives are removed from their original packaging and the use of alternate labeling elements are appropriate as allowed under the HCS. However, OSHA is not making a finding in this rulemaking that it will be appropriate to follow Rev. 9 in every case because this was not put through notice and comment and the agency has not, therefore, had the opportunity to consider every possibility that might cause a conflict between the HCS and Rev. 9. Label preparers who wish to follow Rev. 9 in a given situation must carefully consider whether doing so will comply with the HCS. 
OSHA also received several 
comments regarding explosives that are out of scope for this rulemaking. SAAMI commented about potential confusion between the definitions of the term article in the HCS versus in DOT 
regulations as they applied to ‘‘explosive articles.’’ SAAMI noted that ‘‘in the HCS, ‘explosive articles’ are ‘items’ rather than ‘articles’ and are thus covered by the HCS’’ (Document ID 0294, p. 3). They expressed concern that the term ‘‘article’’ is used in DOT regulations, but has a different meaning than the term used in the HCS, which could cause confusion since DOT articles may not be OSHA articles. They suggested that OSHA should clarify the distinction ‘‘in the preamble of the final rule or in the HCS itself’’ (Document ID 0294, p. 3). 
OSHA did not propose any updates to 
the definition of article in the NPRM, 
therefore this comment is out of scope for this rulemaking. Furthermore, since OSHA does not use the term ‘‘explosive article’’ in the HCS and has carefully delineated between ‘‘articles’’ and ‘‘items’’ as it pertains to explosives, the agency disagrees with SAAMI that the differences between the DOT and HCS terms will cause confusion. OSHA notes that in the 2012 update to the HCS, the agency was careful to explain the difference between the long-standing definition of article in the HCS and the 
term ‘‘item’’ when referring to explosives (77 FR 17722). OSHA will 
consider explaining, as suggested by SAAMI, the terminology in the updated guidance products it will produce following the promulgation of this final rule. 
DOD also commented on the 
definition of article and argued that 
paragraph 1.3.2.1.1 of Rev. 7 creates confusion regarding whether explosives are covered by the HCS. They suggested 
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clarifying that explosive and 
pyrotechnic items, as defined in paragraph B.1.1.1 of Appendix B, are within the definition of ‘‘chemical.’’ As stated above OSHA did not propose changes to the term ‘‘article’’ or ‘‘chemical’’, therefore this comment is out of scope for this rulemaking. The agency also believes that under the regulatory text of the HCS it is clear that all explosives are covered under the HCS. However, OSHA will consider further clarifying that explosives are covered as it updates guidance products to reflect this final rule. 
OSHA also received a comment from 
Daniel Nicponski of Albany Molecular, resubmitting his e-correspondence communication with OSHA regarding his concern that the calculation in B.1.3.4 is incorrect (Document ID 0304, p. 1). Because OSHA did not propose a change to this formula, this comment is out of scope for this rulemaking. However, the agency notes that this issue has been brought up in a variety of fora including an OSHA and DOT Public meeting, the UN Subcommittee of Experts on the Transport of Dangerous Goods (UNSCETDG) and the International Group of Experts on the Explosion Risks of Unstable Substances (IGUS) meeting. These discussions are ongoing and may result in an update to the formula in a future revision of the GHS. If the GHS decides to update the formula, OSHA will consider updating the formula in B.1.3.4 in a subsequent rulemaking. 
OSHA received a comment and 
supporting documents from Ben Barrett, a private citizen, providing information for the docket documents that identified potential inconsistencies and potential solutions for the classification of unintentionally energetic substances in the UN Manual of Tests and Criteria 
(Document ID 0463). These proposals are still under consideration by the UN Subcommittee of Experts on the Transport of Dangerous Goods and have yet to be incorporated into the manual. Similar to the discussion above, Barrett’s comment is not related to a proposed change and is therefore out of scope for this rulemaking; however, if the Manual of Tests and Criteria is updated in the future, OSHA will consider incorporating by reference the updated version in a subsequent rulemaking. 
II. Flammable Gases (Appendix B.2) 
OSHA proposed several changes to 
the Flammable Gases hazard class 
(Appendix B.2). Most significantly, OSHA proposed to subdivide Category 1 of this class into two subcategories, 1A and 1B, and to specify that pyrophoric gases and chemically unstable gases are 
to be classified as Category 1A, in alignment with changes made in Rev. 7 (Document ID 0060, p. 53) since OSHA updated the HCS in 2012. As explained in the NPRM, the proposed subcategories would provide downstream users with a better understanding of the severity of the hazards associated with the flammable 
gases in each category in order to take 
appropriate precautions or determine if a substitute chemical is less hazardous. Furthermore, OSHA noted that the proposed bifurcation (splitting flammable gases Category 1 into Category 1A and 1B) would not alter transportation requirements for flammable gases because all flammable gases categorized as either 1A or 1B would still count as Category 1 flammable gases for the transportation classification and communication scheme. 
Most comments that OSHA received 
on this change supported the proposal to subdivide Category 1 of the Flammable Gases hazard class. Commenters supported this change for a variety of reasons, including that it improves alignment with the GHS (Document ID 0316, pp. 21–22; 0366, p. 7), it will encourage the use of less harmful substances (Document ID 0298, p. 1), and it will facilitate the transition to low Global Warming Potential (GWP), lower flammability refrigerants which will fit into the new GHS Category 1B classification (Document ID 0355, pp. 1– 2; 0311, pp. 1–2). 
OSHA received one comment 
objecting to the proposal to split flammable gases into subcategories. NPGA noted that similar federal regulations, codes, and standards do not distinguish by categories of flammability and argued that this is because it is inconsequential and that employers, employees, or emergency responders do not apply different handling or safeguard protocols to ‘extremely flammable’ products compared to ‘flammable’ products. Additionally, they asserted that the agency’s discussion in the NPRM indicated an ambition to direct chemical choices for purposes they consider to be beyond the scope of the HCS. They asked the agency to consider 
eliminating distinctions in flammability and promulgate one flammability hazard statement for a single category of flammability (Document ID 0364, pp. 4– 5). 
OSHA disagrees with NPGA’s 
assertions. The agency notes that NPGA’s comments did not include any information to support their claim that 
distinctions among flammable products are inconsequential to the selection of 
handling procedures and safeguards. OSHA has good reason to believe that the two categories previously provided for flammable gases should be further refined, and in particular that splitting flammable gas Category 1 into Category 1A and Category 1B will better articulate the hazards of flammable gases to support appropriate hazard communication, identification, and assessment of alternatives. Category 1 and Category 2 were based on the percentage of the gas in a mixture with air that is ignitable and on ranges of flammability in air. In practice, based on those criteria, almost all flammable gases (except ammonia and methyl bromide, which are treated separately) are classified as Category 1. Therefore, no distinctions were drawn between gases that exhibit a wide spectrum of flammable properties for hazard identification and communication purposes. The new subcategories of flammable gases provide greater information on the exact conditions under which the gas is flammable ( i.e., 
flammability limit and its fundamental burning velocity) and how flammable the gas is. Therefore, under the proposed divisions downstream users will have the information necessary to determine whether an alternative product would be not only less flammable but also less likely to propagate, and thereby cause less risk to workers (86 FR 9707). 
Furthermore, NPGA’s claim that 
OSHA exceeded the scope and purpose of the HCS misstates OSHA’s position. In the NPRM, OSHA noted that the subdivision of Category 1 flammable gases would facilitate users choosing a less flammable product where possible and gave an example where a non-ozone depleting refrigerant was less flammable than propane although they were both classified as Category 1. This example is consistent with the purpose of the HCS to ensure that chemicals are appropriately classified and information is transmitted to employers and workers to enable better choices for worker safety and health, such as choosing a chemical that is less flammable than an alternative. OSHA was not suggesting in the NPRM that it would prefer to see the non-ozone depleting chemical used because it would reduce ozone depletion, but rather because of its lower flammability. Therefore, OSHA disagrees with NPGA’s objections and is finalizing the update to divide flammable gases into Category 1A and 1B as proposed. 
Heating, Air-conditioning, & 
Refrigeration Distributors International 
(HARDI) asked OSHA to update its 
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Process Safety Management standard 
(PSM), 29 CFR 1910.119, to reflect this change once this rule is finalized (Document ID 0355, p. 2). HARDI’s comment is out of scope for this rulemaking, which pertains solely to updating the HCS. However, OSHA notes, as stated above, that both subdivisions of Category 1 flammable gases (1A and 1B) remain Category 1 flammable gases and therefore are covered by the PSM Standard. 
When OSHA revised the HCS in 2012, 
pyrophoric gases were not classified under Rev. 3 (Document ID 0085). Therefore, to ensure that the 2012 update did not reduce protections and that the hazards of pyrophoric gases would continue to be covered and communicated following the alignment with the GHS, OSHA specifically added pyrophoric gases under the HCS. This involved addressing pyrophoric gases under the definition of ‘‘hazardous chemical’’ and maintaining a definition for ‘‘pyrophoric gas’’ in paragraph (c) of the HCS (77 FR 17704). 
Since OSHA revised the HCS in 2012, 
the UNSCEGHS updated the criteria for flammable gases to include pyrophoric gases (Document ID 0086; 0060, p. 53). Rev. 7 reflects the decision from the UNSCEGHS that pyrophoric gases, as well as chemically unstable gases, should always be classified as Category 1A flammable gases because pyrophoric gases ignite spontaneously in air at temperatures of 54 °C (130 °F) or below, 
and chemically unstable gases are able to react explosively even in the absence of air or oxygen. In the NRPM, OSHA preliminarily agreed with this decision and proposed incorporating it into Appendix B.2. 
OSHA also proposed to adjust the 
definitions in paragraph (c) related to pyrophoric gases to reflect this change in Appendix B.2. Further discussion of changes to the definition section can be found in the Summary and Explanation for paragraph (c). 
OSHA had previously defined 
pyrophoric gas in paragraph (c) as ‘‘a 
chemical in a gaseous state that will ignite spontaneously in air at a temperature of 130 degrees F (54.4 degrees C) or below.’’ The GHS defines a pyrophoric gas as ‘‘a flammable gas that is liable to ignite spontaneously in air at a temperature of 54°C [130 °F] or below’’ (Document ID 
0065, p. 51). This change was officially made in Rev. 8 of the GHS. OSHA proposed to align with the GHS use of the term ‘‘liable to ignite’’ to be more technically accurate, since some pyrophoric gases may have a delayed ignition time (see, e.g., Document ID 
0065, p. 51, Note 4). OSHA also proposed to move the pyrophoric gas 
definition to Appendix B.2. OSHA anticipated that these proposed changes would have no significant impact on the scope of gases considered pyrophoric gases, and did not expect that chemical manufacturers or importers would need to reclassify chemicals due to these changes. 
As noted above, OSHA also proposed 
adding a new subcategory for chemically unstable gases to the flammable gases hazard class to allow for more accurate communication of the hazards associated with those gases. OSHA proposed to adopt the Rev. 7 definition of a chemically unstable gas: ‘‘a flammable gas that is able to react explosively even in the absence of air or oxygen’’ (Document ID 0060, p. 53) in paragraph B.2.1. Consistent with Rev. 7, under proposed Table B.2.1, a Category 1A chemically unstable gas would be further sub-classified into one of two categories based on the temperature and pressure at which it becomes unstable. The proposed criteria for Category 1A/ A chemically unstable gases are ‘‘flammable gases which are chemically unstable at 20 °C (68 °F) and a standard 
pressure of 101.3 kPa (14.7 psi).’’ The proposed criteria for Category 1A/B chemically unstable gases are ‘‘flammable gases which are chemically unstable at a temperature greater than 20°C (68 °F) and/or a pressure greater 
than 101.3 kPa (14.7 psi).’’ 
As OSHA explained in the NPRM, a 
chemically unstable gas is a subcategory of flammable gases, and any chemical that meets the criteria for chemically unstable gas would have met the previous HCS definition of flammable gas. While these hazards were classified in flammable gases, the UNSCEGHS noted that these gases exhibit slightly different behaviors, have the propensity to react dangerously even in the absence of any reaction partner ( e.g., air or 
oxygen), and should have different hazard communication elements (Document ID 0250, p. 5). Because chemical manufacturers are currently classifying chemically unstable gases as flammable gases, OSHA did not propose a new hazard category for these gases. Instead, OSHA proposed the addition of chemically unstable gases as a separate category in the appendix for flammable 
gases (Appendix B.2) to improve the 
way the hazards of these gases are 
identified, evaluated, and 
communicated. 
Rev. 7 (Document ID 0060, p. 53) also 
added three clarifying notes under Table 
2.2.1 that were not included in Rev. 3 
(Document ID 0085). The notes provide 
guidance on the classification of 
flammable gases under the new hazard categories. OSHA proposed to add these 
notes to the HCS following Table B.2.1 because they allow for better clarity and communication of hazards. Proposed Note 2 states ‘‘In the absence of data allowing classification into Category 1B, a flammable gas that meets the criteria for Category 1A shall be classified by default in Category 1A.’’ Proposed Note 3 states ‘‘Spontaneous ignition for pyrophoric gases is not always immediate, and there may be a delay.’’ Proposed Note 4 states ‘‘In the absence of data on its pyrophoricity, a flammable gas mixture should be classified as a pyrophoric gas if it contains more than 1% (by volume) of pyrophoric component(s).’’ 
Rev. 7, in Chapter 2.2.4.2, provides 
additional guidance on the classification of flammable gases, including the new hazard categories (Document ID 0060, p. 57). It includes updated references to consensus standards and test methods (i.e., ISO 10156:2017), and new references to consensus standards and test methods related to the new hazard categories (i.e., ISO 817:2014, IEC 
60079–20–1 ed1.0 (2010–01), DIN 51794, and Part III of the UN Manual of Tests and Criteria). OSHA proposed to adopt these changes, with edits to make the GHS criteria mandatory ( i.e., 
changing ‘‘should’’ to ‘‘shall’’), to add U.S. units of measurement ( e.g., 
Fahrenheit), and to incorporate by reference the cited standards and test methods. To incorporate this guidance from the GHS Chapter 2.2.4.2, OSHA proposed edits to the already-existing paragraph B.2.3. (B.2.3.1, as proposed) and proposed similar language in new paragraphs B.2.3.2, B.2.3.3 and B.2.3.4. However, OSHA did not propose to require chemicals that were already classified using an earlier version of ISO 10156 to be reevaluated with the updated test method; the updated criteria would apply only to new chemicals or chemicals not already classified. 
The revisions to B.2.3.1 proposed to 
update the consensus standards and testing methods that were previously referenced in that section. Proposed B.2.3.2 included guidance on the test methods to determine pyrophoricity. Proposed B.2.3.3 includes guidance regarding when testing should be 
considered for pyrophoric gases and how to classify flammable gas mixtures if testing has not been done. Proposed B.2.3.4 provides guidance on the test methods to determine chemical stability, including references to the most up-to-date editions. 
OSHA received a few comments on 
the additions of pyrophoric gases and chemically unstable gases as 
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subcategories to the flammable gases 
hazard class. API indicated they supported the proposed changes as they would align with the GHS (Document ID 0316, pp. 21–22). Cal/OSHA submitted several comments on OSHA’s proposed changes in Appendix B.2. pertaining to Notes 3 and 4 below Table 2.1 and proposed paragraph B.2.3.3. 
First, Cal/OSHA observed that Note 3 
‘‘describes a uniquely hazardous property of pyrophoric gases; that is, their potential delay in ignition,’’ which in their view demonstrates the necessity of clear testing protocols and ‘‘erring on the side of classification and labelling to protect downstream users’’ (Document ID 0322, Att. 2, p. 7). Cal/OSHA requested that OSHA revise proposed Note 3, which states that spontaneous ignition is not always immediate, by removing ‘‘and there may be a delay’’ from the first sentence, and adding in a second sentence a discussion of the factors which influence the time it takes for pyrophoric gases to spontaneously ignite and by stipulating that a rigorous testing regime is required for all flammable gases that contain pyrophoric components in any amount. Cal/OSHA’s suggested text also states that ‘‘when experience or past practice indicates a higher degree of hazard [than indicated by testing], the classification must reflect that experience’’ (Document ID 0322, Att. 2, pp. 7–8). 
Second, Cal/OSHA submitted 
comments on OSHA’s proposed paragraph B.2.3.3 and argued that it ‘‘gives undue discretion to producers at the expense of workers and downstream users’’ since it would allow producers to avoid classifying and labeling a flammable gas as pyrophoric ‘‘when experience in production or handling shows that the substance does not ignite spontaneously on coming into contact with air at a temperature of 130 °F (54 
°C) or below’’ (Document ID 0322, Att. 1, p. 17). Finally, they asserted that the paragraph is inconsistent with Note 3 since OSHA in one place is providing manufacturers the discretion on when to test and in another place indicating caution because there is variability and cases where the pyrophoric effects may be delayed, which indicates pyrophoric gases are ‘‘uniquely hazardous.’’ Cal/ OSHA commented that this introduces 
‘‘ambiguities and unclear regulatory direction with regard to pyrophoric gases’’ and suggested deleting paragraph B.2.3.3 in its entirety (Document ID 0322, Att. 2, pp. 7–8). 
Finally, Cal/OSHA requested that 
OSHA revise proposed Note 4, which states that a flammable gas mixture should be classified as a pyrophoric gas if data on its pyrophoricity is absent and it contains more than 1% (by volume) 
of pyrophoric component(s). Cal/OSHA suggested revising this note to state that ‘‘All flammable gases that contain 0.01% or more of a pyrophoric gas must be subjected to testing for pyrophoricity and classified accordingly.’’ They also suggested changing ‘‘should’’ to ‘‘must’’ and ‘‘1%’’ to ‘‘0.01%’’ in the existing sentence. Finally, they suggested adding a sentence indicating that ‘‘when 
experience or past practice indicates 
pyrophoricity with a lesser percentage, the classification must reflect that experience’’ (Document ID 0322, Att. 2, pp. 7–8). 
OSHA disagrees with most of Cal/ 
OSHA’s suggested changes. First, OSHA does not require testing under the HCS. This has been a long-standing position (48 FR 53291, 53336). Therefore, it would not be appropriate to add testing requirements or imply testing requirements under this hazard class. This does not negate the fact that SDS and label preparers must use all available data and relevant experience when classifying chemicals. But to the extent that Cal/OSHA’s suggested revisions to Notes 3 and 4 would mandate testing in order to comply with the HCS, they would be contrary to the approach taken in the HCS. Therefore, OSHA is not adopting them. 
OSHA also does not see B.2.3.3 and 
Note 3 as creating inconsistencies or ambiguities in requirements for classification of pyrophoric gases. B.2.3.3 provides the requirements for classification and Note 3 provides some guidance on the potential properties of pyrophoric gases that SDS and label preparers need to be aware of. OSHA does not believe that either B.2.3.3 alone or these paragraphs in combination give manufacturers undue discretion but rather accounts for the inherent challenges of requiring classification without requiring testing. B.2.3.3’s statement that experience can be used to determine whether to apply the classification procedures for pyrophoric gases does not mean that experience can override test data; if there are already test data available for these chemicals 
that indicate it is pyrophoric, the test 
data would be used over ‘‘experience’’ 
or ‘‘expert judgement.’’ B.2.3.3 also 
requires that the manufacturer classify 
the chemical if it contains 1 percent or 
greater of a pyrophoric gas in the absence of testing, which means the classifier only has discretion when a mixture contains less than 1.0 percent pyrophoric gas. OSHA therefore disagrees with Cal/OSHA’s request to delete paragraph B.2.3.3. OSHA also 
does not agree that 1% should be 
changed to 0.01% in Note 4. Cal/OSHA did not supply any additional 
information or data supporting why OSHA should deviate from the GHS text that was developed by the subject matter experts at the GHS subcommittee. However, OSHA will consider whether to include some of the discussion regarding variability of spontaneous ignition that Cal/OSHA suggested for Note 3 as recommendations when OSHA updates its classification guidance following promulgation of this final rule. 
OSHA agrees with Cal/OSHA that the 
wording in Note 4 should include mandatory language instead of ‘‘should.’’ OSHA’s original intent was to update proposed GHS text where appropriate to make it mandatory, including Note 4. 
For the reasons discussed above, 
OSHA is finalizing all of section B.2 as proposed, with the exception of changing ‘‘should’’ to the mandatory language ‘‘shall be’’ in Note 4. 
III. Aerosols and Chemicals Under 
Pressure (Appendix B.3) 
OSHA proposed to align with Rev. 7 
(Document ID 0060, pp. 59–62) by expanding the existing Flammable Aerosols hazard class (Appendix B.3) to include non-flammable aerosols as well as flammable aerosols. Under Rev. 3 and the 2012 HCS, Chapter 2.3 and Appendix B.3, were each titled ‘‘Flammable Aerosols.’’ Under Rev. 3, the hazards presented by non-flammable aerosols were either not classified at all or were classified in another health hazard class or physical hazard class (e.g., gases under pressure) (Document 
ID 0085). 
As OSHA explained in the NPRM (86 
FR 9708), the agency believes that most aerosols are classified as gases under pressure under Rev. 3 (and were classified accordingly under the HCS) because of the design criteria of the aerosols under DOT regulations (Document ID 0163). Under DOT regulations, aerosols are ‘‘any non- refillable receptacle containing a gas compressed, liquefied, or dissolved under pressure’’ and the highest permissible pressure is 180 psig at 130°F in most cases (see 49 CFR 171.8, 
173.306). Accordingly, under DOT regulations, most aerosols meet the current HCS criteria for gases under pressure, which are gases contained in a receptacle at a pressure of 200 kPa (29 psig) or more, or which are liquefied or liquefied and refrigerated (see existing paragraph B.5.1). However, OSHA believes that classifying aerosols as gases under pressure may not accurately identify the hazards of aerosols because aerosol containers differ from 
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pressurized gas cylinders in terms of 
container characteristics and failure mechanisms. 
Since Rev. 3, the UNSCEGHS and the 
UNSCETDG agreed to rename Chapter 2.3 ‘‘Aerosols’’ and to add a new non- flammable aerosol hazard category, Category 3, to the aerosols hazard class (Document ID 0060, pp. 59–60). This hazard category now captures aerosols that (1) contain 1% or less flammable components (by mass); and (2) have a heat of combustion that is less than 20 kilojoules per gram (kJ/g). 
As OSHA described in the NPRM, 
OSHA assessed the hazards associated with aerosol containers and compressed gas cylinders to consider the impacts of the proposed change and ensure that it would not compromise worker safety and health. A study conducted for OSHA by ERG, an OSHA contractor, evaluated how aerosol products and gases under pressure differ in terms of container characteristics, failure mechanisms, and previous incidents (Document ID 0009). The ERG report concluded that sizes and pressures of compressed gas cylinders far exceed those of hand-held containers typically used for aerosol products. The report also noted differences in failure mechanisms for pressurized cylinders versus aerosols, including that although non-flammable aerosol cans do not present a significant fire hazard, they can present a hazard from bursting resulting from thermal content expansion during heating (Document ID 0009). This conclusion was also supported by data from OSHA’s Fatality and Catastrophe Information Summary (FatCat) database, located at https://
www.osha.gov/pls/imis/accidentsearch.html, which revealed that employees are at greater risk of a fatality due to the failure of the container if they are working with compressed gas cylinders than they are if they are working with aerosol cans (86 FR 9709). 
Following a review of the data and the 
ERG report, OSHA preliminarily 
determined that a new category for non- flammable aerosols is appropriate. Additionally, OSHA noted that this new classification would ensure compressed gas pictograms are not included on aerosol labels, eliminating the risk of ‘‘over warning’’ about the hazards of aerosol containers (UN, 2010, Document ID 0095). 
OSHA proposed several other changes 
related to changes in the GHS including: updating the aerosol hazard class to include non-flammable aerosols (Category 3 in Table B.3.1); changing the name of Appendix B.3 from ‘‘Flammable Aerosols’’ to ‘‘Aerosols;’’ replacing the phrase ‘‘flammable aerosols’’ with ‘‘aerosols’’ throughout Appendix B.3, as appropriate; and adding clarifying information from Rev. 7 to paragraph B.3.2 (now B.3.1.2) (Document ID 0060, p. 59). For example, OSHA proposed to revise Note 2 to B.3.2.1 (now B.3.1.2.1) to explain that aerosols do not fall within the scope of gases under pressure, but may fall within the scope of other hazard classes. OSHA preliminarily concluded that aerosols (flammable and non- flammable) should not also be classified 
as gases under pressure in order to 
ensure that the appropriate hazard warnings are presented on aerosol containers. 
OSHA also proposed to adopt Rev. 7 
(Document ID 0060) criteria for a non- flammable aerosol (i.e., an aerosol that does not meet the criteria for Category 1 or 2, contains less than or equal to 1 percent flammable components (by mass), and has a heat of combustion less than 20 kJ/g)), and to add those criteria as new Category 3 in Table B.3.1. This new category, Category 3, was proposed to update hazard communication requirements to better reflect the true hazards of non-flammable aerosols. As further discussed below in the Summary and Explanation for Appendix C, OSHA reasoned that this would also result in changing the labeling for any such aerosols that are currently classified as compressed gases, including the pictogram and hazard statements, and would better differentiate between the hazards associated with compressed gases and the hazards associated with aerosols. 
OSHA received several comments on 
the proposed changes to the aerosol 
hazard class. ACA, IHSC, and Seymour 
of Sycamore supported the inclusion of non-flammable aerosols (Document ID 0368, p. 9; 0349, p. 2; 0321, p. 2). HCPA also expressed support, noting that ‘‘Expanding the current ‘Flammable Aerosols’ hazard class to include all aerosol products not only makes logical sense but aligns with both the GHS Rev.7 and GHS Rev. 8’’ (Document ID 0327, pp. 8–9). Michele Sullivan commented that ‘‘The proposed changes to the Flammable Aerosols/Aerosols Chapter are particularly welcomed’’ because they re-align the HCS with the GHS. NIOSH agreed with OSHA that the addition of a new hazard class and several new hazard categories to Appendix B would improve worker safety through more specific descriptions of hazards (Document ID 0281, Att. 2, p. 5; 0423 pp. 22–23). ACC commented in support of changes to the aerosols category that more closely align with the GHS (Document ID 0347, p. 6). Two commenters recommended that 
OSHA make the compressed gas 
cylinder pictogram optional (Document ID 0368, p. 9; 0321, p. 2). Seymour of Sycamore suggested allowing the optional use of the pressurized cylinder 
pictogram for both non-flammable and 
flammable aerosols because ‘‘[t]he use of the pressurized cylinder icon provides information to the end user that the product is under pressure and the end user needs to be aware of conditions that could make the product unsafe if the product is exposed to those conditions’’ (Document ID 0321, p. 2). ACA similarly asked OSHA to make the use of the pressurized cylinder pictogram optional because aerosols are common in both consumer products and the workplace, even though they also noted ‘‘[i]n environments where workers have a more sophisticated understanding of pictograms, the symbol could lead to some confusion as to whether the product is a non- flammable aerosol or a gas under pressure’’ (Document ID 0368, pp. 9– 10). 
OSHA disagrees with these comments 
for several reasons. First, as OSHA indicated in the NPRM, the main reason for revising the aerosol chapter is to better differentiate the hazards of aerosols and compressed gases. As discussed above and in the NPRM, allowing the compressed gas cylinder to aerosols would lead to ‘‘over warning’’ on aerosols and could also dilute the message for compressed gases. In addition, allowing the optional use of compressed gas pictogram would introduce inconsistency between labels of similar products, and may confuse downstream users, which ACA noted even as it suggested allowing the pictogram. OSHA also notes that the hazard statement for nonflammable aerosols makes clear that the container is pressurized and therefore believes the hazard noted by Seymore of Sycamore is already accounted for appropriately. Therefore, OSHA will not allow the optional use of the compressed gas pictogram for aerosol products. However, aerosol cans that have already been released for shipment as of the compliance date of this final rule for labelling updates do not need to be relabeled and may bear the compressed gas pictogram. 
Although OSHA proposed updates to 
the classification and labeling of aerosols to align with Rev. 7, the agency also noted in the NPRM that Rev. 8 contains several significant additional changes in the aerosol chapter and requested comments on whether the 
agency should adopt two specific changes that appear in Rev. 8. 
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First, Rev. 8 lists classification criteria 
for aerosols as text in a table (see the 
GHS Table 2.3.1, Criteria for aerosols), similar to other hazard chapters, rather than referring classifiers to the decision logics (Document ID 0065, pp. 57–58). When OSHA revised the HCS in 2012, the agency declined to adopt the GHS decision logics and used its own text for classification of flammable aerosols in Appendix B. In the NPRM, OSHA preliminarily determined that there are no substantive differences between OSHA’s current text and the text represented in the new Rev. 8 table, although they contain slightly different language. 
Several commenters suggested that 
OSHA should adopt the updated language in Rev. 8 instead of Rev. 7 (Document ID 0316, p. 22; 0347, p. 6; 0327, p. 9; 0309, p. 14). ACC indicated updating to the Rev. 8 criteria table would maximize harmonization, thereby reducing the regulatory burden on their members (Document ID 0347, p. 6). 
While HCPA supported aligning with 
Rev. 8, they asked OSHA to change proposed Table B.3.1 by deleting ‘‘Contains >1% flammable components’’ from the Category 2 criteria to align with the table in Rev. 8. HCPA reasoned that the proposed version of Table B.3.1 could be misinterpreted to mean that an aerosol product Category 3 cannot contain one percent or more of flammable material by mass or have a heat of combustion equal to or greater than 20 kJ/g, which would conflict with the GHS’s two different criteria for an aerosol product to be classified as a Category 3 aerosol (Document ID 0327, pp. 9–10). 
OSHA disagrees with HCPA’s 
comment. The first step in the decisions logics for aerosols in Rev. 7 and Rev. 8 clearly states that only if an aerosol has both less than one percent flammable component and less than 20 kJ/g can it directly go to category three. Only after it fails the subsequent criteria for Category 1 and 2 can it also become a Category 3 aerosol (Document ID 0060, pp. 60–62; 0065, p. 59). OSHA has taken this into account by using the word ‘‘and’’ in Category 3 to indicate that the additional criterion applies to an aerosol that has either greater than one percent flammable components or ≥20 kJ/g. The 
proposed criterion for Category 3 was 
intended to encompass both scenarios as described by HCPA. Additionally, OSHA disagrees that the HCS table could be interpreted to mean that a Category 3 aerosol could not have greater than one percent flammable components because the language ‘‘Contains >1% flammable components, or the heat of combustion is ≥20 kJ/g’’ 
in Category 2 is linked to the other 
criteria with an ‘‘and’’. Therefore the correct interpretation is that a chemical that does not meet all of the criteria of Category 2 is a Category 3 chemical, rather than that just having more than one percent flammable components or a heat combustion greater than or equal to 
20 kJ/g indicates a chemical belongs in 
Category 2. Therefore, OSHA declines to make the modifications requested by HCPA. However, to avoid any potential confusion with the proposed layout, OSHA is making an editorial change to Category 3 by placing a (1) before the phrase ‘‘The chemical does not meet the criteria for Categories 1 and 2’’ and a (2) before the phrase ‘‘the chemical contains <1% flammable components (by mass) and has a heat of combustion <20 kJ.g.’’ 
NIOSH expressed concern that 
incorporating the Rev. 8 changes might lower worker protections relative to the proposed paragraph B.3.1 in the HCS (Document ID 0281, Att. 2, p. 5). They noted that Table 2.3.1 in Rev. 8 allows certain aerosols with a heat of combustion ≥20 kJ/g to be classified in 
Category 3, while the proposed paragraph B.3.1, which aligns with Rev. 7, requires all aerosols with a heat of combustion ≥20 kJ/g to be classified in 
Category 1 or 2. Therefore, NIOSH reasoned, adoption of Rev. 8 provisions in Table B.3.1 might lower worker protections from aerosols which could be classified in Category 3 under the Rev. 8, but not the Rev. 7, decision logic. 
OSHA agrees with NIOSH that there 
appears to be to an inconsistency between Category 2 and Category 3 as they are presented in Table 2.3.1 of Rev. 8. OSHA notes that the Table B.3.1 in the HCS is consistent with the decision logics provided in paragraph 2.3.4.1 of Rev. 7 (Document ID 0060, p. 60) and paragraph 2.3.1.4 of Rev. 8 (Document ID 0065, p. 59). 
To avoid confusion and to harmonize 
with trading partners, such as Canada, 
which adopted Rev. 7, OSHA is finalizing changes to the aerosols hazard class to align with Rev. 7, as proposed. OSHA will review the criteria in Rev. 8 for aerosols at the UN subcommittee to ensure that it accurately reflects the original decision logics. 
The second update to the 
classification and labeling of aerosols in Rev. 8 that OSHA requested comment on was the adoption of a new hazard category, chemicals under pressure, within the aerosols class (Document ID 0065, pp. 61–63). OSHA noted that these products function similarly to aerosol dispensers covered under DOT (49 CFR 173.115) but are packed in 
pressure receptacles (refillable and non- refillable) of up to 450 liters (86 FR 9693). Chemicals under pressure used for spray applications present hazards similar to those presented by aerosol dispensers. Therefore, the classification criteria and hazard information for the Rev. 8 hazard category of chemicals under pressure are the same as for aerosols. In the NPRM, OSHA recognized that adopting this hazard classification would bring some chemicals under the purview of the HCS that currently are not covered (e.g., certain aerosols in refillable containers) (86 FR 9693). 
OSHA requested comment on 
whether the agency should adopt the Rev. 8 hazard category and classification criteria for chemicals under pressure in the aerosol chapter. The agency received several comments supporting the addition of chemicals under pressure. Michele Sullivan was also generally supportive and noted that ‘‘[t]his new hazard category can be helpful to some stakeholders’’ but requested that OSHA stay as close as possible to the GHS text (Document ID 0366, p. 2). NIOSH supported the addition of chemicals under pressure since it would improve worker safety and health by covering certain chemicals that might not be otherwise captured under the HCS (Document ID 0281, Att. 2, p. 5). Ameren and ACC also supported the addition of chemicals under pressure (Document ID 0309, p. 14; 0347, p. 6). HCPA supported the addition of chemicals under pressure to the HCS, but as a separate chapter from aerosols. They noted that there are differences between aerosols and chemicals under pressure such as the difference in size limitations. HCPA concluded that since aerosols and chemicals under pressure are independent hazard classes, ‘‘it would be logical for chemicals under pressure to be its own chapter . . . and separate from aerosols’’ (Document ID 0327, p. 9). 
OSHA does not agree with HCPA that 
chemicals under pressure should be in its own chapter. The agency believes that adding these categories to the current chapter B.3 to keep the aerosols and chemicals under pressure hazard classifications in the same chapter is appropriate, since they are often similar chemicals in different receptacles, but is providing separate definitions, hazard criteria, and hazard communication elements to ensure that the differences between these two hazards are recognized. The agency expects that clearly separating the two categories 
with different definitions, criteria, and communication elements will avoid 
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58The flammable liquids standard states ‘‘Boiling 
point shall mean the boiling point of a liquid at a 
pressure of 14.7 pounds per square inch absolute (p.s.i.a.) (760mm). Where an accurate boiling point is unavailable for the material in question, or for mixtures which do not have a constant boiling point, for purposes of this section the 10 percent point of a distillation performed in accordance with the Standard Method of Test for Distillation of Petroleum Products, ASTM D–86–62 . . . may be used as the boiling point of the liquid.’’ 29 CFR 1910.106(a)(5). creating any confusion related to its 
inclusion in chapter B.3. Furthermore, including it in the aerosols chapter allows the HCS to remain aligned with the GHS and its numbering system. 
For the reasons discussed above, 
OSHA is adding chemicals under pressure as a separate hazard classification in the HCS within the aerosols chapter. In adopting the chemical under pressure hazard classification, OSHA is following a similar structure to the GHS. OSHA is renaming B.3 ‘‘Aerosols and Chemicals Under Pressure’’ and adding a new B.3.2 ‘‘Chemicals under pressure’’, including B.3.2.1 ‘‘Definition’’ and B.3.2.2 ‘‘Classification criteria.’’ OSHA is renumbering B.3.2 ‘‘Classification criteria (under Aerosols) to B.3.1.2 to maintain consistency with the GHS. In finalizing the chemicals under pressure hazard classification, OSHA is including all three categories as defined in Table 2.3.3 in Rev. 8 as well as the hazard communication elements in Table 2.3.4 in Rev. 8 (Document ID 0065, p. 62) in Appendix C.16. OSHA has also removed the word ‘‘aerosol’’ from B.3.3.2 to maintain alignment with the updates from Rev. 8 and to indicate that the formation calculation relates to both aerosols and chemicals under pressure. 
For the reasons discussed above, 
OSHA is finalizing Appendix B.3 as Aerosols and Chemicals Under Pressure. In the aerosols section, the agency is aligning with Rev. 7 by including non- flammable aerosols as a category and making the necessary revisions associated with that change. The agency is not adopting Table 2.3.1 from Rev. 8. The agency is, however, adding chemicals under pressure to B.3 in alignment with Rev. 8. 
OSHA received one out of scope 
comment on Appendix B.3. Toby Threet suggested that OSHA change the word ‘‘aerosol,’’ as used in the context of physical hazards, to ‘‘spray cans’’ in order to better differentiate between the meaning of aerosol in Appendix A and Appendix B (Document ID 0279, pp. 6– 8). OSHA did not propose any changes to the definition or use of the term aerosol so this comment is out of scope; 
therefore, the agency is not making the suggested change. Furthermore, the agency does not believe that the inconsistency in how aerosol is used in Appendix A and Appendix B is an issue in practice. Over the past 10 years, while OSHA has published many letters of interpretation pertaining to requests for clarification of terms in the HCS, the usage of the term aerosol has not been 
raised as an issue, nor has OSHA seen issues pertaining to these definitions in 
classifications. 
IV. Oxidizing Gases (Appendix B.4) 
OSHA proposed to revise the note in 
B.4.1, and the text in B.4.3 ‘‘Additional 
classification considerations,’’ to clarify that the provisions are referring to the most recent version of the ISO 10156 standard. In the NPRM, OSHA explained that the proposed change would provide more clarity on the definition and classification of oxidizing gases and lead to more accurate classification and improved communication and would also align with Rev. 7 (Document ID 0060, pp. 63– 65). OSHA noted that it did not propose to require reclassification of chemicals already classified using an earlier version of ISO 10156, only that new chemicals or chemicals not already classified needed be classified according to the new ISO standard. OSHA did not 
receive any comments on this revision and is finalizing it as proposed. 
V. Gases Under Pressure (Appendix B.5) 
OSHA proposed to align the 
definition of gases under pressure in 
B.5.1 with Rev. 7 (Document ID 0060, p. 67) by adding a temperature of 20 degrees Celsius (68 degrees Fahrenheit) so that the full definition reads ‘‘gases which are contained in a receptacle at a pressure of 200 kPa (29 psi) (gauge) or more at 20 °C (68 °F), or which are 
liquefied or liquefied and refrigerated.’’ The proposed change was intended to clarify that the pressure of the receptacle is measured at standard conditions. OSHA also proposed to align with Rev. 7 by adding a note to Table B.5.1 to clarify that aerosols should not be classified as gases under pressure (Document ID 0060, p. 67). The 
proposed change was a consequence of 
OSHA’s proposal to add a new hazard category for non-flammable aerosols, as discussed previously. OSHA received one comment from HCPA indicating that they supported the proposed note under Table B.5.1 (Document ID 0327, p. 9). OSHA is therefore finalizing these changes as proposed. 
VI. Flammable Liquids (Appendix B.6) 
OSHA proposed to make several 
clarifying changes to the flammable 
liquid hazard class in Appendix B.6. First, OSHA proposed to add a reference to paragraph (a)(14) of the Flammable Liquids standard (29 CFR 1910.106), in paragraph B.6.3 in order to provide additional guidance about methods that can be used to determine flash point for storage purposes. Second, after updating the HCS in 2012, OSHA realized there may be a concern with ensuring that information needed to determine the 
appropriate storage for flammable liquids is adequately documented on the SDS. Per 29 CFR 1910.106(a)(5), when an accurate boiling point is unavailable, or for mixtures which do not have a constant boiling point, the boiling point may be based on the 10% point of a distillation performed in accordance with the Standard Method of Test for Distillation of Petroleum Products, ASTM D–86–62. Together with an appropriately measured flash point, this boiling point can be used to categorize the mixture for use with Table H–12 in § 1910.106 to determine the maximum allowable container size and type. Use of a boiling point reported in Section 9 of an SDS (physical properties), which is based on the ‘‘first drop’’ (or initial) distillation temperature in D–86, will likely be conservative, but may lead to more restrictive storage requirements than would be the case using the 10% distillation point (see Appendix D, section 9(f)). OSHA therefore proposed to add a clarifying footnote to B.6.3 explaining that to determine the appropriate container size and container type for a flammable liquid, the boiling point must be determined by the methods specified under OSHA’s Flammable Liquids standard (29 CFR 1910.106(a)(5)) and listed on the SDS.
58 
In addition, the proposed note would explain that if the chemical manufacturer, importer, or distributor used an alternative calculation (namely, the 10% distillation point method) to find the boiling point to determine the appropriate storage for flammable liquids, this must be clearly noted on the SDS (in sections 7 and 9) to alert downstream users. In the NPRM, OSHA explained that the agency did not intend for the updated HCS classification requirements for flammable liquids to impact the longstanding storage requirements under 29 CFR 1910.106. Manufacturers can still use the flexibilities under § 1910.106 for mixtures which do not have a constant boiling point when determining storage requirements. The proposed note was intended to ensure that the proper 
container size and type will be used for storing flammable liquids while still 
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appropriately communicating all 
necessary information on the SDS. OSHA did not propose any changes to the classification criteria for flammable liquids under the HCS. OSHA also requested comments on whether a footnote like the one proposed for B.6.3 should be inserted in Appendix D, Section 9. 
Finally, OSHA realized that a note 
regarding cross-classification of aerosols was inadvertently omitted from Appendix B.6. In the 2012 HCS, Appendix B.3 (formerly flammable aerosols) includes note 2 to the classification criteria, which previously indicated that ‘‘[f]lammable aerosols do not fall additionally within the scope of flammable gases, flammable liquids, or flammable solids.’’ The HCS contains a cross-referencing note in Appendix B.2 (flammable gases), but OSHA inadvertently omitted the statement in Appendix B.6. OSHA therefore proposed to add a note stating that aerosols should not be classified as flammable liquids following Table B.6.1, for consistency and to minimize confusion, in alignment with Rev. 7 (Document ID 0060, p. 71). 
Several commenters expressed 
concerns about OSHA’s proposed addition of footnote 9 to Appendix B.6 (Document ID 0339, p. 3; 0316, p. 23; 0359, p. 5; 0347, p. 23). API indicated that they were concerned about this change not aligning with GHS (Document ID 0316, p. 23). DGAC stated that they did not support limiting the determination of the initial boiling point to just two ASTM standards because they believe it is not necessary to list how to determine it and they were concerned that OSHA was excluding the methods for determining initial boiling point in the HMR (Document ID 0339, p. 3). Similarly, IHSC commented that they did not support the addition to require the initial boiling point to be determined by methods in § 1910.106 and suggested that OSHA limit this requirement for mixtures that contain an ingredient (greater than 1 percent) with a boiling point less than 95 °F 
(Document ID 0349, p. 2). Dow commented that they disagreed with the proposal to determine the initial boiling point by methods in § 1910.106 because they believed this was a change to OSHA’s position that it does not require testing (Document ID 0359, p. 5). ACC commented on the second half of the footnote specifically, requesting that OSHA remove the requirement to note an alternate calculation in Sections 7 and 9 of the SDS and asking why this was included as a proposal in the update (Document ID 0347, p. 23). OSHA believes that several of these 
commenters may have misunderstood OSHA’s proposed changes. Contrary to DGAC, IHSC, and Dow’s assertion, OSHA did not intend to suggest that the boiling point could only be determined by the methods specified under OSHA’s Flammable Liquids standard. First, 29 CFR 1910.106(a)(5) does not specify the means of determining the initial boiling point except ‘‘Where an accurate boiling point is unavailable for the material in 
question, or for mixtures which do not 
have a constant boiling point,’’ so footnote 9 only addresses the calculation of boiling point when it is being used to determine a storage container and type and where the conditions in the flammable liquids standard are met. Second, while the language of footnote 9 is mandatory (‘‘shall be determined by methods specified under § 1910.106(a)(5)’’), the language in paragraph (a)(5) of the flammable liquids standard is permissive (‘‘may be used as the boiling point of the liquid’’). When read together it is clear that manufacturers, importers, and distributors can use other methods approved by the HCS to determine boiling point and the flammable liquids standard only adds another option for calculating boiling point under specified conditions. This was intended to ensure that the HCS is compatible with § 1910.106 and to clarify situations where using the initial boiling point for HCS classification would result in storage requirements that might differ from the requirements under § 1910.106. 
This alternate calculation is solely 
allowed in determining the storage requirements for flammable liquids where an accurate boiling point is not available and practically speaking would only apply to Category 1 flammable liquid mixtures. For example, if a Category 1 flammable liquid had an initial boiling point of 80 °F under the methods in the HCS, but 
using the 10 percent point of distillation 
accommodation for mixtures under 
§ 1910.106(a)(5) resulted in a boiling 
point of 100 °F, then for storage purposes under § 1910.106 it would be considered a Category 2 flammable liquid. The new footnote makes explicit that this second calculation is allowed to be used for determining storage requirements under the HCS, but the SDS preparer would need to add in Sections 7 and 9 of the SDS a note stating that an alternate calculation was used for determining storage requirements. For the example given above, an appropriate note would be ‘‘Initial boiling point 80 °F/estimated boiling point 100 °F (for storage 
purposes).’’ However, if a category 1 flammable liquid mixture had an initial boiling point of 80 °F under the HCS 
methods and the boiling point using the accommodation for mixtures under § 1910.106(a)(5) was 92 °F, then for 
storage purposes the flammable liquid mixture would still be a Category 1 flammable liquid and there would be no obligation to put in the additional note on the SDS. OSHA believes this clarification addresses the concerns raised by these commenters. However, to the extent that DGAC was commenting on the sentence ‘‘The initial boiling point shall be determined in accordance with ASTM D86–07a or ASTM D1078,’’ OSHA did not propose any changes to that section and has previously also limited the calculation of boiling point to these two ASTM standards, so that comment would be out of scope. 
Additionally, nothing in the proposal 
should be read to require testing as Dow asserted. As with all of the references to testing standards in the HCS, OSHA is only stating what methods are acceptable for determining certain characteristics, not requiring the SDS or label preparer to do these kinds of testing themselves. As to ACC’s question regarding why the calculation of initial boiling point should be included in Sections 7 and 9 of the SDS if an alternate calculation was used for storage purposes, OSHA proposed including that requirement to ensure clarity on what underlying information about the chemical was used so that users are able to apply that information accurately to their own workplace and ensure worker safety. OSHA therefore disagrees with ACC that this requirement should be removed. Finally, OSHA disagrees with API’s assertion that this footnote is problematic because it is not aligned with the GHS. The alternate calculation is not used in the ultimate classification of flammable liquids under the HCS, therefore the HCS is in full alignment with the GHS. The addition of the footnote is supplemental information (as allowed by the GHS) and, as stated above, OSHA is including this requirement to ensure clarity about the underlying information. 
Even so, these comments indicate that 
the proposed language may be confusing, so although OSHA is finalizing the proposed changes to B.6 (Flammable Liquids), the agency has updated the footnote for clarity. As finalized, Footnote 9 to Appendix B.6 reads: ‘‘To determine the appropriate 
flammable liquid storage container size and type, the boiling point shall be 
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determined by § 1910.106(a)(5). In 
addition, the manufacturer, importer, and distributor shall clearly note in Sections 7 and 9 of the SDS if an alternate calculation was used for storage purposes and the classification for storage differs from the classification listed in Section 2 of the SDS. ’’ 
(Emphasis added to new text.) 
OSHA received comments from ACA 
and Hach asking OSHA to add Note 2 from beneath Table 2.6.1 of Rev. 7 to the HCS (Document ID 0323, pp. 11–13; 0368, p. 12). That note states that liquids with a flash point of more than 35 °C and not more than 60 °C need not 
be classified as non-flammable liquids for some regulatory purposes, such as transport, if negative results have been obtained in the sustained combustibility test according to the sustained combustibility test L.2 of Part III, section 32 of the UNTDG, Manual of Tests and Criteria (Document ID 0060, p. 71). Hach commented that adding this note to the HCS would relieve compliance burdens and customer confusion regarding the classification of certain liquids and suggested a slightly altered version of the note in order to align with DOT PHMSA’s regulation under 49 CFR 173.120 (Document ID 0323, pp. 11–13). Hach’s comment is out of scope for this rulemaking since the agency did not propose any changes relating to this aspect of liquids classification. Furthermore, this note was also part of Rev. 3 and OSHA opted not to incorporate Note 2 when promulgating the HCS in 2012 because it would reduce protections in workplaces, where conditions may vary highly when handling chemicals ( e.g., heating 
chemicals above their flashpoint) (77 FR 17722). 
VII. Flammable Solids (Appendix B.7) 
OSHA proposed one change to 
Appendix B.7 (Flammable Solids): a 
new Note 2 following Table B.7.1 stating that aerosols should not be classified as flammable solids. As with flammable liquids, the UNSCEGHS observed this omission in the flammable solids chapter, and Rev. 7 includes this note (Document ID 0060, p. 75). OSHA did not receive any comments relating specifically to the addition of the new note and is finalizing it as proposed. 
OSHA received one comment 
pertaining to Appendix B.7. Toby Threet asserted that OSHA should not promulgate provisions for flammable solids until the agency has definitive criteria for ‘‘fire by friction’’ (Document ID 0279, pp. 18–20). OSHA notes that this hazard class was first promulgated in 2012 and OSHA did not propose to update the criteria for flammable solids. Therefore, Threet’s comment is outside 
the scope of this rulemaking. 
VIII. Self-Heating Chemicals (Appendix 
B.11) 
OSHA proposed adding a note 
beneath Table B.11.1 to explain that classification of solid chemicals must be based on tests performed on the chemicals as presented. The note also provides an example indicating that if a chemical is presented for supply or 
transport in a physical form different 
from that which was tested and which is considered likely to materially alter its performance in a classification test, classification must be based on testing of the chemical in the new form. Although this note was included in Rev. 3 (Document ID 0085, Att. 2, p. 84), and incorporated into Appendices B.1, B.7, B.10, B.12 and B.14 in the HCS in 2012, it was inadvertently omitted from Appendix B.11. OSHA proposed to add 
the note to be consistent with the GHS and the way the HCS treats other physical hazards. OSHA did not receive any comments on the new note and is finalizing it as proposed. 
IX. Chemicals Which, in Contact With 
Water, Emit Flammable Gases (Appendix B.12) 
OSHA proposed to update the 
classification criteria for Category 3 of this hazard class in Table B.12.1. In Rev. 3 (Document ID 0085, Att. 2, p. 87) and in the 2012 HCS, one of the criteria for a Category 3 classification is that the maximum rate of evolution of the flammable gas is equal to or greater than 1 liter per kilogram of chemical per hour. OSHA explained in the NPRM that this criterion does not accurately reflect the corresponding criteria in Test N.5 in Part III, sub-section 33.5.4.4.1 of the UN Manual of Tests and Criteria, which provides that the maximum rate of evolution of the flammable gas is greater than 1 liter per kilogram of 
chemical per hour (Document ID 0151, p. 379). OSHA proposed to delete the 
words ‘‘equal to or’’ in the Category 3 
criteria in Table B.12.1 to make the 
classification criteria consistent with the 
criteria in the test methods, aligning 
with Rev. 7 (Document ID 0060, p. 91). 
OSHA preliminarily determined this proposed change would not affect worker protections. OSHA did not receive any comments on this change and is finalizing it as proposed. 
X. Oxidizing Solids (Appendix B.14) 
OSHA proposed to add a second set 
of classification criteria to B.14.2 and to 
Table B.14.1 based on a new UN test method. Under Rev. 3 (Document ID 0085, Att. 2, p. 95), classification of oxidizing solids was based only on Test 
O.1 from Part III, sub-section 34.4.1 of the UN Manual of Tests and Criteria (Document ID 0151, p. 382). This was reflected in the 2012 HCS, Appendix B.14. In the NPRM, OSHA explained that the test material used as the reference mixture in Test O.1 has been noted to pose a cancer hazard and is difficult to purchase. Therefore, a new test, Test O.3 (Gravimetric tests for oxidizing solids), which uses a reference mixture of calcium peroxide, has been added to Part III, sub-section 34.4.3 of the UN Manual of Tests and Criteria and the Recommendations on the Transport of Dangerous Goods Model Regulations (TDG MR) (Document ID 0151, p. 393; 0150, p. 100). Consistent with Rev. 7 (Document ID 0060, p. 97), OSHA proposed to allow oxidizing solids to be classified using either Test O.1 or Test O.3. The agency further noted that since the proposed classification criteria would allow the use of data from either Test O.1 or O.3, data from existing classifications could be used and no new testing would be required for substances or mixtures that were previously classified based on Test O.1. 
OSHA also proposed to update Note 
1 to Table B.14.1 to reflect a 2017 revision to the International Maritime Solid Bulk Cargoes Code for testing of explosion hazards (Document ID 0141). OSHA did not receive any comments on the addition of Test O.3 or on the update to this note and is therefore finalizing both as proposed (with a technical amendment to reorganize B.14.2 to better clarify which version of the Manual of Tests and Criteria is appropriate for Test O.1 and Test O.3). 
OSHA received one comment on 
Appendix B.14 from Cal/OSHA opposing the language in B.14.3.3, which requires that, in the event of a difference between test results and known experience in the handling and use of chemicals which shows them to be oxidizing, judgements based on known experience take precedence over test results. Cal/OSHA suggested revising B.14.3.3 to state that ‘‘experience demonstrating an oxidizing hazard shall take precedence over negative test results’’ (Document ID 0322, Att. 1, pp. 12–13). OSHA did not propose any changes to B.14.3.3 in the NPRM, therefore this comment is outside the scope of this rulemaking. OSHA notes that Cal/OSHA’s suggested language, while structured differently than B.14.3.3, presents the same requirement: producers must disclose oxidizing hazards for a chemical if the producer has experience that indicates 
those hazards, even if test results for the chemical are negative. Further 
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discussion on the use of expert 
judgement in the classification process can be found in the Summary and Explanation for Section B.2 (flammable gases). 
XI. Corrosive to Metals (Appendix B.16) 
OSHA did not propose to make any 
changes to Appendix B.16, Corrosive to 
Metals. This is notable because OSHA preliminarily decided not to adopt a note that was added in Chapter 2.16 of Rev. 7, under Table 2.16.2, which states: ‘‘Where a substance or mixture is classified as corrosive to metals but not corrosive to skin and/or eyes, some competent authorities may allow the labelling provisions described in 1.4.10.5.5’’ (Document ID 0060, p. 107). Chapter 1.4.10.5.5 contains, in relevant part, labeling provisions that state competent authorities can allow the corrosive to metals pictogram to be omitted from labels for ‘‘substances or mixtures which are in the finished state as packaged for consumer use’’ (Document ID 0060, p. 32). As was discussed in the NPRM, OSHA preliminarily concluded that the note in question, and the labeling provisions it refers to, are not applicable to the HCS because the HCS applies only to use of chemicals in the workplace, and not to consumer products (29 CFR 1910.1200 (b)(5)(v)) and therefore OSHA did not propose to adopt the note. OSHA did not receive any comments on this preliminary conclusion and is therefore finalizing its decision not to add the note to Appendix B.16. 
OSHA received one out of scope 
comment on this hazard class. Toby Threet commented that OSHA should add copper to Table 16.1 (Document ID 0279, p. 22). OSHA notes that since the agency did not propose adding copper to Table 16.1 or otherwise changing it, this comment is outside the scope of this rulemaking. 
XII. Desensitized Explosives (Appendix 
B.17) 
OSHA proposed to add a new 
physical hazard class for desensitized explosives to align with Rev. 7 (Document ID 0060, p. 109). Desensitized explosives are chemicals that are treated so that they are stabilized, or their explosive properties are reduced or suppressed. As OSHA discussed in the NPRM, these types of chemicals can pose a hazard in the workplace when the stabilizer is removed, either as part of the normal work process or during storage of the chemical. Therefore, it is important that the hazards be identified and appropriately communicated. In the 2012 HCS, OSHA 
acknowledged, consistent with Rev. 3 
(Document ID 0085, Att. 6, p. 15), that these chemicals are considered explosives if the wetting agent is removed by including in Appendix C, C.4.14, the precautionary statement ‘‘Keep wetted with’’ and instructing the chemical manufacturer, importer, or distributor to specify appropriate material for wetting if drying out increases the explosion hazard. However, the hazard statement, signal word, pictogram and other 
precautionary statements required 
under the 2012 HCS C.4.14 primarily target more conventional explosives. This gap in communication was recognized as early as 2005, when the UNSCEGHS noted that desensitized explosives may become explosive under certain circumstances—especially after long-term storage and during handling and use (Document ID 0206). In 2014, the UNSCEGHS concluded that a new hazard class was warranted for desensitized explosives in the GHS (Document ID 0087). Rev. 7 separately classified desensitized explosives with a full set of unique label elements (including the appropriate signal word, hazard statement, pictogram, and precautionary statements) (Document ID 0060, pp. 109–112). Desensitized explosives are labeled with a flame pictogram rather than the explosive bomb used for explosives, and the precautionary statements are tailored to the specific traits of desensitized explosives. 
As discussed in the NPRM, OSHA 
reviewed the UNSCEGHS reports on desensitized explosives and preliminarily concluded that the hazard class should also be added to the HCS to improve communication about these hazards. While the chemicals captured 
by the desensitized explosives hazard 
class were covered under the scope of 
the 2012 HCS as explosives, OSHA 
preliminarily determined that adding 
the proposed new hazard class to the 
HCS would ensure downstream users receive more accurate hazard information on labels and in SDSs for these chemicals. 
For these reasons, and to align with 
the GHS, OSHA proposed to add the desensitized explosives hazard class to the HCS as Appendix B.17. As explained in the NPRM, OSHA intended the new Appendix B.17 to provide relevant definitions and general considerations, specify applicable classification criteria, and include information about additional classification considerations for this 
hazard class, as well as reference several sections from the UN Manual of Tests and Criteria that would be incorporated 
by reference. As with all hazard classes, Rev. 7 does not require testing and allows classifiers to use data reported in the literature that was generated using specified or equivalent test methods. Proposed Appendix C.4.30 included the proposed communication elements for desensitized explosives relevant to proposed Appendix B.17. 
The proposed Appendix B.17 was 
based on Chapter 2.17 of Rev. 7 (Document ID 0060, p. 109–112). OSHA proposed to adopt most of the classification language on desensitized explosives from Chapter 2.17 to minimize deviations from the GHS. However, similar to the 2012 rulemaking, OSHA carefully reviewed each of the hazard classification criteria within the context of the HCS and proposed to modify some of the language. These edits included changing some recommendations in the GHS to mandatory requirements in the HCS (i.e., changing ‘‘should’’ to ‘‘shall’’); 
revising some terms in the GHS to more accurately reflect terminology in the HCS (e.g., changing ‘‘manufacturer/ 
supplier’’ to ‘‘manufacturers, importers, and distributors’’); revising text to make it clear that data for classification can be obtained from the literature; and removing references to classifications for transportation that do not apply under the HCS. OSHA also proposed adding a definition for ‘‘phlegmatized,’’ which is drawn from the TDG MR, in a footnote because many stakeholders may be unfamiliar with that term from the UN Recommendations. 
OSHA did not propose to include 
portions of Chapter 2.17 that do not relate specifically to the method of classification for desensitized explosives, such as the text relating to hazard communication (which is in Appendix C) and the decision logics. OSHA may, however, use the decision logics in guidance materials. 
OSHA received several comments on 
the proposed addition of Appendix B.17, all of which supported adopting the desensitized explosive hazard class. ACC, API, Michele Sullivan, and Dow expressed support for aligning the classification of desensitized explosives with the GHS and trading partners (Document ID 0347, p. 17; 0316, p. 23; 0366, p. 7; 0359, p. 5). API commented 
that ‘‘[d]esensitized explosives should be classified in accordance with GHS’’ (Document ID 0316, p. 23). Other than ensuring that the language is appropriate for OSHA’s jurisdiction and written in regulatory language, OSHA’s proposal follows the GHS classification criteria. For the reasons explained above, OSHA is finalizing Appendix 
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B.17 as proposed with minor editorial 
changes. Stakeholders can examine the redline strikeout of the regulatory text (changes from 2012 HCS to this final) at OSHA’s HCS web page ( https://
www.osha.gov/dsg/hazcom/) to view all of the changes to the 2012 HCS made in this final rule. Additionally, in the NPRM OSHA requested comments on whether the agency should, in the final rule, update all of the existing references to UN ST/SG/AC.10 (many of which are in Appendix B) to Rev. 6 or add Rev. 6 references to the existing Rev. 4 references such that they would be alternative options for compliance. OSHA only received one comment on this, which was from Ameren, and which supported adding the Rev. 6 references to allow for compliance alternatives (Document ID 0309, p. 14). 
As discussed in the Summary and 
Explanation for Incorporation by Reference, OSHA has decided to retain the generic citation to ST/SG/AC.10 in all places where compliance with Rev. 4 or Rev. 6 is allowed, and has inserted specific citations to ST/SG/AC.10/11/ Rev.6 where only Rev. 6 is allowed for compliance (for instance, in situations where new text was added to Rev. 6 and there was no comparable material in Rev. 4). For further discussion of that issue, see the Summary and Explanation for Incorporation by Reference. 
OSHA also received one general 
comment on Appendix B from Cal/ OSHA, noting that ‘‘In several places, referenced technical documents are out- of-date’’ and recommending that the most recent versions of document should be used ‘‘unless there is a specific reason not to, such as where an updated test method is less sensitive than the previous method, for example’’ (Document ID 0322, Att. 2, p. 14). Cal/ OSHA did not provide further details on 
which references to technical documents it believed were out of date. OSHA is updating several references to technical documents in this rulemaking, which are discussed throughout the Summary and Explanation, and it concludes that it has updated all of the appropriate references. 
E. Appendix C 
Appendix C includes requirements 
and instructions for the allocation of 
label elements. Paragraph (f)(2) requires the chemical manufacturer, importer, or distributor to ensure that the information provided on the label is in accordance with Appendix C. Appendix C provides hazard statements, signal words, pictograms, and precautionary statements for all four essential aspects of hazardous chemical management (prevention, response, storage, and disposal), as well as general labeling instructions. 
OSHA proposed several updates to 
Appendix C to improve communication of hazard information on labels. These changes were proposed in order to: (1) address labeling requirements for the new hazard classes and categories in Appendix B (physical hazards); (2) align the HCS with Rev. 7; and (3) improve alignment of the HCS with other federal agencies and Health Canada’s labeling 
requirements in furtherance of the goals 
of the RCC. 
As was discussed in OSHA’s 2009 
proposal to align the HCS with the GHS, the precautionary statements, unlike the hazard statements, were not harmonized (but were merely codified) under the GHS, meaning that numbers were assigned to them. This meant that the statements were not yet considered to be part of the harmonized text (like hazard statements); rather they were included in the GHS as suggested language (74 FR 50282–83). OSHA chose to add these statements in the final HCS rule in 2012 (77 FR 17574). However, since the promulgation of the updates to the HCS in 2012, the UNSCEGHS has continued work to improve the utility of precautionary statements by providing better guidance on the allocation of statements, updating the statements to provide better protection, and adding new statements for new hazard classes and categories. In the 2021 NPRM, OSHA proposed several changes based on new precautionary statements and instructions in Rev. 7. Additionally, since 2012, OSHA has continued to work with other Federal agencies on crosscutting labeling issues. Some updates to Appendix C were proposed to align with DOT labeling regulations. OSHA also proposed updates to 
Appendix C based on the agency’s 
cooperation with Health Canada under 
the RCC. The RCC was reaffirmed 
through a memorandum of understanding signed in June 2018 (Document ID 0217), with the expectation of aligning efforts for international trade requirements between the two countries. 
Overall, OSHA anticipated that the 
proposed changes to Appendix C would provide improved communication of hazard information and greater detail and clarity for downstream users, which would maintain or enhance the safety and health of workers. The agency also expected the updates would more consistently align the HCS with other Federal and international regulations, thereby easing compliance burdens for U.S. stakeholders that must also comply with those requirements. The changes OSHA proposed to 
Appendix C and the changes OSHA is 
now finalizing are extensive. OSHA addresses the substantive changes in the discussion below, and in addition to the regulatory text below, OSHA will provide a redline strike-out version of the final text of Appendix C on the OSHA website ( https://www.osha.gov/ 
dsg/hazcom/), as it did for the NPRM. This version will reflect all of OSHA’s revisions, including all non-substantive updates. This will allow interested parties to view all of the changes in context to aid in the implementation of the updated regulatory text. OSHA encourages stakeholders to use that document in conjunction with the discussion of the revisions below, as the discussion does not fully describe all of the non-substantive or editorial changes OSHA is making. 
I. Sections C.1–C.3 
The instructions in the beginning of 
Appendix C (C.1–C.3) provide 
directions and information about the signal words, pictograms, hazard statements and precautionary statements required in C.4. OSHA proposed several changes to C.1–C.3. 
First, OSHA proposed to revise Figure 
C.1, Hazard Symbols and Classes, to 
include ‘‘HNOC (non-mandatory)’’ as a hazard identified by the exclamation point pictogram. This proposed change would codify OSHA’s agreement with Health Canada to permit the exclamation mark pictogram to be used for HNOCs. While OSHA does not require labeling for HNOC hazards, Health Canada requires a pictogram, signal word, hazard statements, and precautionary statements for HNOCs. To ensure that U.S. and Canadian requirements can simultaneously be met for HNOCs, OSHA and Health Canada have provided guidance allowing an exclamation mark pictogram to be used 
for HNOCs (Document ID 0103). Use of the exclamation mark pictogram would not be mandatory under the HCS. OSHA also added desensitized explosives under the flame pictogram in Figure C.1, and that change is discussed with the other changes related to desensitized explosives below (see discussion of revisions to C.4). 
OSHA proposed several additional 
related changes. As discussed above under the Summary and Explanation for paragraph (f), OSHA proposed to move the existing text in paragraph C.2.3.3 from Appendix C to paragraph (f)(5)(iii) in the text of the standard, so that all of the instructions related to the transport of hazardous chemicals and DOT regulations are in one section of the HCS. OSHA also proposed to replace 
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that text in C.2.3.3 with a new 
paragraph, which would allow the exclamation mark pictogram to be used for HNOCs if the words ‘‘Hazard Not Otherwise Classified’’ or the letters ‘‘HNOC’’ appear below the pictogram on the label. Additionally, because any pictogram may appear only once on a label, OSHA proposed to add a new paragraph at C.2.3.4 to specify that if multiple hazards require use of the same pictogram, it may not appear a second time on the label. This includes situations when the exclamation mark pictogram would be used for both an HNOC and for another hazard. OSHA requested comments on these proposed changes, particularly whether the agency should require the exclamation mark pictogram to be used for HNOCs. 
OSHA received several comments 
supporting the proposal to include ‘‘HNOC (non-mandatory)’’ as a hazard identified by the exclamation point pictogram (Document ID 0349, p. 2; 0309, p. 17) and agreeing that use of the pictogram for HNOCs should not be mandatory (Document ID 0316, p. 25; 0347, p. 18; 0366, p. 7). OSHA received no comments objecting to these revisions to Figure C.1, C.2.3.3, and C.2.3.4 and is therefore finalizing them as proposed. 
The remaining changes OSHA 
proposed for C.2 reflect updates to the GHS that are intended to provide additional flexibility to the label preparer while still communicating the required information. OSHA proposed to add new paragraph C.2.4.7 to note that precautionary statements may contain minor textual variations from the text prescribed elsewhere in Appendix C (e.g., spelling variations, 
synonyms, or other equivalent terms), as long as those variations assist in the communication of safety information without diluting or compromising the safety advice. This proposed new paragraph also required that any variations must be used consistently throughout the label and SDS. Because of the proposed addition of new paragraph C.2.4.7, OSHA also proposed to renumber existing paragraphs C.2.4.7 and C.2.4.8 to become C.2.4.8 and C.2.4.9, respectively. 
ACC and Michele Sullivan generally 
supported the addition of proposed paragraph C.2.4.7 because it adds 
flexibility (Document ID 0347, p. 18; 0366, p. 8). ACC, however, requested that OSHA remove the proposed requirement to use any variations in precautionary statements consistently on the label and SDS. According to ACC, most companies use SDS software that comes with the GHS precautionary phrases from the regulation already pre- loaded and ready for use; therefore, in their view, modifying the phrases in the SDS software in small ways to exactly match the text on the label would create a significant burden without enhancing worker protection (Document ID 0347, pp. 18–19). Michele Sullivan similarly stated that making small changes to precautionary statements that do not 
change their meaning requires 
significant time and money without improving worker protection or safety (Document ID 0366, p. 8). 
OSHA disagrees with ACC’s request. 
New paragraph C.2.4.7 is permissive, not mandatory, so label preparers can opt to rely on language provided in Appendix C and used by their existing software rather than expend additional time and resources to modify the statements if they do not find it beneficial. In addition, OSHA’s understanding is that the software used to create SDSs and labels can be updated, if necessary, to apply variations in precautionary statements consistently across both SDSs and labels in order to comply with the proposed requirement. OSHA has determined that variations should be applied consistently on the label and in the safety data sheet in order to avoid confusion and convey health and safety information consistently to workers. 
Cal/OSHA objected to proposed 
C.2.4.7 and stated that ‘‘[s]tandard language is essential for workers to become accustomed to particular signal words. The proposed change could open the door for legal disputes with OSHA over synonyms and the meaning of ‘other equivalent terms,’ ‘diluted’ and ‘compromised’ ’’ (Document ID 0322, Att. 2, pp. 8–9). 
OSHA has considered Cal/OSHA’s 
concerns and has concluded that minor variations should be allowed as they can, in some cases, improve communication of safety information to workers. OSHA notes that the provision to allow minor variations in precautionary statements only allows label preparers to use variations that at least equally convey the required safety 
information to workers. For example, 
this provision would allow for spelling 
variations, synonyms, or other 
equivalent terms appropriate to the region where the product is supplied and used, which may improve readability and comprehensibility for workers in some situations. OSHA also does not agree that these terms would be difficult to enforce or would result in significant litigation issues. For the reasons discussed above, OSHA is finalizing paragraph C.2.4.7 as proposed. OSHA also proposed to add a new 
paragraph, C.2.4.10, to address cases where substances or mixtures that are classified for multiple hazards may trigger multiple precautionary statements for medical responses. Precautionary statements involve both an ‘‘if’’ statement, either based on route of exposure or the symptoms being experienced, and a medical response, such as ‘‘call a poison center/doctor’’ or ‘‘get medical advice/attention.’’ In a situation where a substance or mixture is classified for multiple hazards and therefore triggers multiple precautionary statements, this could result in redundancy of either the ‘‘if’’ statement component or the medical response component. 
To address this concern, consistent 
with Rev. 7 (Document ID 0060, pp. 302–303), OSHA proposed a system of prioritization and combination for precautionary statements. Under proposed C.2.4.10(a), when the hazards have similar routes of exposure or health outcomes, labels would usually only need to include one precautionary statement reflecting the medical response at the highest level with the greatest urgency, combined with at least one route of exposure or symptom ‘‘if’’ statement. For example, in a situation where a substance was classified as two different hazards (such as skin corrosion Category 1C and acute toxicity Category 3 for dermal) which required different medical responses to the same route of exposure, the statement, ‘‘Immediately call a poison center/doctor/. . .’’ would be prioritized over the less urgent ‘‘call a poison center/doctor’’ and would be the only medical response required on the label for that route of exposure. Proposed paragraph C.2.4.10(b) would allow for (but not require) combination of medical response statements where multiple routes would trigger similar medical statements. This means that if a chemical has, for example, inhalation and skin contact hazards that would require the same level of medical response, both of these routes of entry could be listed in a combined statement. Thus, if a chemical is classified as acute toxicity Category 2 inhalation and acute toxicity Category 2 dermal then the statement can read ‘‘if inhaled or on skin immediately call poison center/ doctor.’’ Proposed paragraphs (a) and (b) can also be used in combination. However, proposed paragraph C.2.4.10(c) would prohibit the combination of medical response statements where the statements ‘‘Get medical advice/attention if you feel unwell’’ and ‘‘Get immediate medical advice/attention’’ are both indicated. 
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The agency requested comments on this 
system of prioritization in proposed C.2.4.10 and on whether the proposed prioritization provisions would improve clarity on labels. 
Several commenters supported the 
addition of proposed paragraph C.2.4.10. NIOSH stated that the proposed changes to paragraph C.2.4.10 would clarify hazards, citing a pre-GHS study of the comprehensibility of material safety data sheets (MSDSs) which showed that ‘‘wordiness contributed to difficulty in understanding them [Kolp et al. 1993]’’ (Document ID 0281, Att. 2, p. 5). Dow similarly commented that by reducing the amount of text on labels, the prioritization specified in C.2.4.10 would make the labels less confusing and easier to understand. Dow further observed that some manufacturers are already doing this, and that the proposed change would align with requirements of major trading partners (Document ID 0359, p. 5). Ameren also agreed that precautionary statements for medical responses should be prioritized (Document ID 0309, p. 17). 
OSHA also received several critical 
comments on proposed paragraph C.2.4.10. Cal/OSHA and Worksafe raised concerns that the proposed change would allow label preparers to present medical response precautionary statement for only one of several hazards to users (Document ID 0322, p. 3; 0354, p. 4), and that prioritization can lead to misinterpretation (Document ID 0344, p. 3) or would leave workers, emergency responders and downstream users without the information they need to formulate an appropriate medical response to exposure (Document ID 0322, p. 3; 0405, p. 20). The American Federation of State, County, and Municipal Employees (AFSCME) noted similar concerns and recognized the value specifically in including medical response precautionary statements to address both immediate (acute) and long-term (chronic) medical concerns when needed, since the appropriate medical care may differ for a medical emergency versus potential chronic diseases such as may occur from prolonged or repeated exposures (Document ID 0344, p. 3). 
OSHA disagrees with these 
commenters that the proposed 
paragraph C.2.4.10, if the general principles are followed as OSHA intended, would result in information being omitted from the label. However, OSHA acknowledges that the use of the term ‘‘usually’’ is ambiguous and might create confusion. OSHA also agrees that only one precautionary statement will not suffice in every situation. As OSHA discussed in the NPRM, the agency believes there is value in including more than one precautionary statement related to medical response to address both immediate (acute) and long-term (chronic) medical concerns; appropriate medical care may be different depending on whether there is a medical emergency (e.g., chemical 
burns) or concerns about potential diseases (e.g., cancer) due to prolonged 
exposures. Therefore, to clarify the requirements for combination and prioritization of medical response statements, OSHA is revising C.2.4.10(a) to read ‘‘If the same medical response statement is triggered multiple times, the label need only include one precautionary statement reflecting the response at the highest level with the greatest urgency, which should always be combined with at least one route of exposure or symptom ‘‘IF’’ statement.’’ OSHA believes this more specific version better expresses the agency’s expectations for when and how label preparers may combine and prioritize medical response statements, to simplify the presentation of medical response information while retaining the information most important for end users to view on the label. Additionally, OSHA notes that nothing in paragraph C.2.4.10 changes the requirements of C.2.2 that all applicable hazard statements must appear on the label, so producers are still required to include all hazards associated with their products under the HCS. 
OSHA received several requests for 
clarification regarding proposed paragraph C.2.4.10. Toby Threet asked OSHA to clarify the meaning of proposed paragraph C.2.4.10(c) (Document ID 0279, pp. 22–23). OSHA intended paragraph C.2.4.10 (c) to create a limited exception to C.2.4.10(a) (which allows for label preparers to present only the highest priority medical response statement) and C.2.4.10(b) (which allows combination of medical response statements for multiple routes of exposure). Paragraph C.2.4.10(c) requires that, in the specific case where the medical response precautionary statements ‘‘Get medical advice/attention if you feel unwell’’ and ‘‘Get immediate medical advice/ attention’’ are both applicable to a chemical or mixture, due to multiple hazards triggering multiple 
precautionary statements, they must 
both appear as separate statements on 
the label. In the NPRM, OSHA explained its intent that both of those statements should appear ‘‘without 
prioritization,’’ by which the agency 
meant that both should appear on the label, and that the label preparer does 
not have discretion to decide that they should be combined into a single statement. 
ICT asked OSHA to clarify the extent 
to which proposed paragraph C.2.4.10 was intended to be mandatory, noting that terms such as ‘‘should’’ and ‘‘may’’ in C.2.4.10(a) and (b) seem to indicate that combining or reducing is optional, while C.2.4.10(c) uses similar language (‘‘should appear’’) to indicate something that is required (Document ID 0324, p. 6). 
OSHA intended for proposed 
paragraphs C.2.4.10, (a) and (b) to allow, but not require the label preparer to prioritize and/or combine elements of medical response precautionary statements on the label. In contrast, OSHA intended proposed paragraph C.2.4.10(c) to be a requirement. OSHA agrees with ICT that the use of ‘‘should’’ in C.2.4.10(c) does not clearly convey the agency’s intent and is therefore modifying the proposed language of C.2.4.10(c) to replace ‘‘should’’ with ‘‘must’’. 
ICT further noted that paragraph (f)(2) 
requires that labels must bear the information specified in Appendix C, and that Appendix D states that precautionary statements in the SDS must be in accordance with paragraph (f). ICT inquired whether it follows that, in a case where medical response statements have been prioritized and/or combined for presentation on the label, the medical response statements may be similarly presented in the SDS (Document ID 0324, pp. 5–6). 
ICT is correct that the SDS is not 
required to include any more or different medical statements than are presented on the label. If a label is only 
required to have one medical response statement in accordance with paragraph C.2.4.10, then the SDS may also contain only that statement. OSHA further notes that it is permissible, but not required, for SDS preparers to include additional medical response statements beyond those included on the label. 
OSHA also received several 
comments generally requesting clarification regarding the principles in C.2.4.10 (Document ID 0339, p. 3; 0358, p. 3; 0349, p. 2) and two commenters requested that OSHA develop guidance (Document ID 0358, p. 3; 0349, p. 2). OSHA notes that Annex 3 of Rev. 7, Annex 3 (A3.3.2.4) contains useful information on the application of precautionary statements regarding medical response. In A3.3.2.4, Application of precautionary statements concerning medical response, the GHS provides a number of examples of how the principles in C.2.4.10 can be applied 
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when choosing precautionary 
statements to ensure clarity of the most appropriate safety message (Document ID 0094, pp. 302–303). Because OSHA’s language is intended to align with the GHS, the guidance provided in the GHS about how to prioritize and combine precautionary statements also provides information on how to comply with the HCS. Additionally, OSHA will be updating its guidance and anticipates providing additional guidance and examples on this topic. 
OSHA requested input on alternative 
language for paragraph C.2.4.10, based on Rev. 8, in which the medical response precautionary statements would be standardized according to the Hazard Class and Category (86 FR 9576). CGA and GAWDA recommended adoption of the Rev. 8 language on the basis that the standardized statements would make the statement selection process easier when several options are available (Document ID 0310, p. 3). NIOSH supported adoption of the Rev. 8 standardization but recommended that label preparers be given the option to choose a stronger medical response precautionary statement if supported by available information (Document ID 0281, Att. 2, p. 6; 0423, Tr. 23). In contrast, ACC advised OSHA not to adopt the Rev. 8 provision, which ACC believes would be overly prescriptive, would not provide any additional protection, and would not reduce the cost or difficulty of compliance for manufacturers (Document ID 0347, p. 7). ACC testified that the revisions required under the Rev. 8 provision would be a major financial burden because of the cost of updating product labels and that the changes were semantic in nature, providing the example that ‘‘many Appendix C tables include a response statement that directs the user to seek medical care, in addition to the phrase, get medical advice/attention. Revising the label to include the additional phrase is not a meaningful change in the precautionary information being shared with the user’’ (Document ID 0423, Tr. 105). Michelle Sullivan supported optional use of the Rev. 8 precautionary statements (Document ID 0366, p. 2). 
After consideration of the comments 
received about adopting Rev. 8 revisions to medical precautionary statements, OSHA has decided to finalize C.4.2.10 in alignment with Rev. 7, as proposed, because major U.S. trading partners are also aligning with Rev. 7, and OSHA believes the medical precautionary statements in Rev. 7 and Rev. 8 provide equivalent information to downstream user. Furthermore, as discussed in the 
HCS compliance directive (Document ID 0007, p. 6), OSHA allows for the use of updated precautionary statements 
where the messaging directs the user to similar actions. OSHA has determined that the precautionary statements included in Rev. 8 provide similar information and follow the general principles set out in C.2.4.10; therefore, label preparers may use the Rev. 8 precautionary statements in lieu of the Rev. 7 precautionary statements. 
In conclusion, OSHA is modifying 
paragraph C.2.4.10 as explained above to clarify the requirements pertaining to the combination and prioritization of medical response statements and to change the term ‘‘should’’ to ‘‘must’’ in C.4.2.10(c). 
OSHA received two comments that 
recommended the agency add hazard and precautionary phrase codes to Appendix C. DGAC commented that many of their member companies use software that uses these phrase codes to automate hazard classification to populate Section 2 and generate translations, and noted that ‘‘We are not suggesting that the codes be required on the labels or SDS, only in Appendix C for reference only’’ (Document ID 0339, pp. 4–5). Similarly, IHSC recommended that OSHA add the hazard and precautionary statement codes to Appendix C, on the basis that presenting the statement codes in the tables would help users to compare the statements that may be in use under the different versions of the GHS that countries have adopted, and could also assist with translations of SDSs and labels (Document ID 0349, p. 2). This request is out of scope for this rulemaking, as it does not pertain to any of the changes OSHA proposed to the HCS in the NPRM; therefore, the agency is not making the suggested addition. 
OSHA also received a comment 
asking OSHA to change a specific hazard statement. Steven Wodka asked OSHA to change the labeling requirement for chemicals categorized by the HCS as a carcinogen from ‘‘Danger May Cause Cancer’’ to ‘‘Danger 
Causes Cancer’’ (Document ID 0312, p. 6). OSHA aligned its carcinogen warnings with the GHS in 2012 (77 FR 
17742) but did not propose any changes 
to this language in the 2021 NPRM. 
Because OSHA did not propose to 
change this hazard statement, Wodka’s 
request is out of scope for this 
rulemaking. Therefore, OSHA is not making the suggested change. 
Paragraph C.3.3 of the 2012 HCS 
required that where an ingredient with unknown acute toxicity is used in a mixture at a concentration >1 percent, and the mixture is not classified based on testing of the mixture as a whole, a statement that X percent of the mixture consists of ingredient(s) of unknown 
acute toxicity is required on the label. To clarify the requirements of that paragraph, OSHA proposed in the NPRM to add ‘‘(oral/dermal/ inhalation)’’ and ‘‘and safety data sheet’’ to the latter clause so that it reads ‘‘a statement that X% of the mixture consists of ingredient(s) of unknown acute toxicity (oral/dermal/inhalation) is required on the label and safety data 
sheet’’ (emphasis added). DOD noted that paragraph C.3.3 ‘‘should be more explicit about the exact nature of the unknown toxicity . . . e.g., if dermal 
toxicity is unknown, the label should be explicit that the product contains materials of unknown dermal toxicity’’ (Document ID 0299, p. 4). As previously discussed in the Summary and Explanation for Appendix A regarding the similar language added in A.1.3.6.2.3, OSHA intended for the percentage of unknown acute toxicity to be differentiated by route of exposure, given that it is possible to have ingredients with unknown toxicity for more than one relevant route of exposure, and that is reflected in the inclusion of the language ‘‘(oral/dermal/ inhalation)’’ in the text of this paragraph. OSHA anticipates updating the HCS guidance and will include discussion on this point to remove any lingering confusion. Accordingly, OSHA is finalizing the revisions to paragraph C.3.3 as proposed. 
II. Section C.4 
OSHA is updating the hazard label 
elements for specific hazard classes and 
categories. The following discussion on revisions to C.4 is organized according to: (1) Labeling changes resulting from 
the addition of hazard classes and categories in Appendix B (new subcategories for flammable gases (C.4.15), Aerosols category 3 (C.4.16), and desensitized explosives (C.4.30)); (2) revisions to hazard statements, hazard categories, and notes; (3) revisions to precautionary statements; and (4) the GHS revisions that OSHA is not adopting. 
(A) Revisions Based on Additions of 
Hazard Classes and Categories in Appendix B 
OSHA proposed several revisions to 
Appendix C based on the proposed additions of hazard classes and categories to Appendix B. As discussed in the Summary and Explanation for Appendix B, OSHA proposed and is finalizing several changes to the flammable gas hazard class. The changes include: (1) Subdividing category 1 flammable gases into categories 1A and 1B; (2) adding 
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pyrophoric gases into category 1A; and 
(3) adding chemically unstable gases into category 1A (further subdivided into chemically unstable gas A and chemically unstable gas B). The hazard and precautionary statements for those gases, which OSHA proposed to align with Rev. 7 (Document ID 0060, pp. 307–309), are located in C.4.15. OSHA proposed that each type of category 1A gas (including pyrophoric gases and chemically unstable gases) would require the hazard statement ‘‘Extremely flammable gas,’’ as is currently required for Category 1 gases. On the other hand, OSHA proposed that the hazard statement for the new Category 1B flammable gases would be ‘‘Flammable gas.’’ OSHA also proposed that additional hazard and precautionary statements would be added to 
communicate hazards specific to, and 
precautions that need to be taken for, pyrophoric and chemically unstable 
gases. 
As was also discussed in the 
Summary and Explanation for 
Appendix B, OSHA proposed and is finalizing the addition of non-flammable aerosols to the existing ‘‘Flammable Aerosols’’ hazard class and renaming the class ‘‘Aerosols.’’ Consequently, in Appendix C, OSHA proposed to adopt the Rev. 7 hazard and precautionary statements for non-flammable aerosols in C.4.16. OSHA reasoned that these statements would better address the true hazards of aerosols. In cases where aerosols were labeled as gases under pressure, OSHA proposed to require that the label be updated to include the flame pictogram for Categories 1 and 2 (no pictogram would be required for hazard category 3) and the signal word ‘‘warning’’ (if ‘‘danger’’ is not required due to flammability). OSHA also proposed to require the hazard statement ‘‘pressurized container, may burst if heated.’’ OSHA reasoned that these changes would better differentiate the hazards of non-flammable aerosols from those of gases under pressure. 
Finally, OSHA also proposed and is 
finalizing adoption of the hazard class of desensitized explosives in Appendix B. OSHA consequently proposed to adopt, in Appendix C, the pictogram, signal word, hazard statements, and precautionary statements for 
desensitized explosives from Rev. 7. OSHA proposed that the labeling information for desensitized explosives would be added at C.4.30. 
For flammable gases, aerosols, and 
desensitized explosives, OSHA proposed to adopt the Rev. 7 hazard communication information with only minor editorial revisions, such as the use of HCS instead of GHS terminology (e.g., ‘‘manufacturer, importer, or 
distributor’’ instead of ‘‘manufacturer/ 
supplier or the competent authority’’ in conditional instructions). As OSHA discussed in the NPRM, the agency believes that the information called for by Rev. 7 effectively communicates the hazards of those substances and the precautions that need to be taken when 
handling them. Therefore, requiring the 
information to appear on labels would improve hazard communication and enhance worker safety. In addition, because the changes proposed would align the HCS with the GHS, OSHA reasoned that adopting them would ease compliance burdens for U.S. stakeholders that must also comply with international requirements for hazard communication. 
OSHA received several comments 
pertaining to these topics that concern both Appendices B and C. To the extent that the agency received comments on Appendix B that would involve ramifications to Appendix C, those comments have been addressed in the Summary and Explanation for Appendix B. This includes comments requesting that OSHA allow the optional use of the pressurized cylinder icon for non-flammable and flammable aerosols. OSHA disagrees with these comments, as discussed above. Also as discussed in the Summary and Explanation for Appendix B, OSHA received a comment from Toby Threet about changing the use of the term ‘‘aerosol’’ to ‘‘spray cans,’’ which also included a request to change the hazard statements in C.4.16 to use the word ‘‘contents’’ instead of ‘‘aerosol’’ (Document ID 0279, p. 12). For the same reasons described in the Summary and Explanation for Appendix B, OSHA considers this comment out of scope 
and declines to accept this proposal. 
For the reasons discussed above the 
agency is finalizing these revisions as proposed. 
(B) Hazard Statements, Hazard 
Categories, and Notes 
OSHA proposed to revise several 
hazard statements to align with Rev. 7. The hazard statements in the 2012 HCS were adopted from Rev. 3. Since then, the UNSCEGHS continued to discuss the utility and readability of the label elements, including hazard statements, to improve the information presented by clarifying language and eliminating inconsistencies, and to save label space by consolidating or combining language. Except where otherwise discussed below, OSHA proposed to adopt the updated language presented in Annex 3 of Rev. 7 (Document ID 0060) with only minor editorial revisions, such as using the HCS terminology instead of the GHS 
terminology (e.g., ‘‘manufacturer, 
importer or distributor’’ instead of ‘‘manufacturer/supplier or the competent authority’’ in conditional instructions). 
III. C.4.1 (Acute Toxicity—Oral) 
OSHA proposed to consolidate hazard 
category information for C.4.1 acute 
toxicity—oral, by deleting the table for Category 3 and combining Categories 1, 2, and 3 in one table, since all three categories have the same precautionary statements. The change does not affect the substantive communication information for categories 1, 2, or 3; it would simply make C.4.1 more concise. OSHA received no comments on this proposed revision and is finalizing it as proposed. 
IV. C.4.31 (Label Elements for OSHA 
Defined Hazards) 
OSHA is making several changes to 
label elements for OSHA defined hazards (C.4.30 in the 2012 HCS and now in C.4.31). This section of Appendix C addresses the labeling of hazards that are not classified under the GHS, but that the HCS specifically 
defines as hazards that must be communicated on the label and SDS. 
In the NPRM, OSHA proposed to 
delete the entry for ‘‘Pyrophoric Gas.’’ In Rev. 7, pyrophoric gases were made a category under the hazard class of flammable gases, and OSHA proposed to include them there in the HCS as well. OSHA received no comments on removing pyrophoric gas from proposed C.4.31. Therefore, the agency is finalizing it as proposed. 
OSHA also proposed a change to the 
‘‘Combustible Dust’’ hazard statement. When OSHA finalized the revisions to the HCS in 2012, the GHS did not address classification of combustible dust; however, it used combustible dust as an example of ‘‘Other hazards which do not result in classification’’ in Annex 4 of Rev. 7 (A4.3.2.3) (Document ID 0085, Att. 8, p. 408). The GHS had previously recognized combustible dust. In Rev. 5, the UN updated A4.3.2.3 to include the statement ‘‘May form explosible dust/air mixture if dispersed’’ for dust explosion hazards to provide guidance on the type of statement that should be used in the case of dust explosion hazards (Document ID 0251). Subsequently, OSHA initiated UNSCEGHS discussions regarding combustible dust hazards. The UNSCEGHS adopted an annex (Annex 11) that provides additional guidance on hazard identification, the factors that contribute to a dust explosion hazard, and the need for risk assessment, 
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prevention, mitigation, and 
communication (Document ID 0157). In the 2021 NPRM, OSHA therefore proposed to allow either the previously required statement, ‘‘May form combustible dust concentrations in air,’’ or a statement based on Rev. 7 suggested language, ‘‘May form explosible dust-air mixture’’ (Document ID 0060, p. 386). OSHA proposed to add square brackets after both statements containing the following language: ‘‘if small particles are generated during further processing, handling or by other means.’’ This bracketed language was proposed to indicate that this language should be added when the material can only create a combustible dust hazard due to the creation of small particles during the processing or handling of the chemical. OSHA did not propose any changes to 
the signal word of ‘‘warning’’ or any 
pictogram requirements. 
Michele Sullivan asked OSHA to 
provide guidance on the meaning of square brackets around text in the combustible dust hazard statements, to explain in what circumstances the enclosed text should be used (Document ID 0366, p. 8). 
Under C.2.4.5, where square brackets 
appear around text in a precautionary statement, this indicates that the text in square brackets is not appropriate in every case and should be used only in certain circumstances. In these cases, conditions for use explaining when the text should be used are provided (see, e.g., C.4.3, C.4.4, C.4.19, C.4.20, C.4.21, 
and C.4.28). In the case of combustible dust, OSHA did not propose to provide an explanation for the brackets. OSHA agrees that additional explanation is warranted, and has revised the hazard statement for combustible dust to include the following explanation for the brackets for combustible dust: ‘‘Text in square brackets may be used when the material can only create a combustible dust hazard due to the creation of small particles during the processing or handling of the chemical.’’ 
API supported the proposed revision, 
noting that it is consistent with prior OSHA guidance (Document ID 0316, pp. 24–25). Dow expressed support for the codification of OSHA’s prior statements that label preparers can provide additional information on the Hazard Statement to indicate that the hazard 
occurs during downstream processing but voiced concern regarding the proposed change in C.4.31 which would allow for use of either the term ‘‘combustible dust’’ or ‘‘explosible dust’’ as part of the hazard phrase, on the basis that allowing for the use of either name without clear definitions for each could lead to confusion. Dow asked OSHA to provide definitions for the terms 
combustible dust and explosible dust to 
differentiate between them or, alternatively, withdraw its proposal to allow for use of the term explosible dust 
and require use of the term combustible 
dust (Document ID 0359, pp. 5–6). 
OSHA acknowledges that neither the 
GHS nor the HCS include a definition of ‘‘Explosible’’ or ‘‘Explosible Dust’’, 
but notes that the term ‘‘explosible’’ is 
widely used in industry, and OSHA uses the term ‘‘explosible’’ in its publication on the Hazard Communication Guidance for Combustible Dusts (Document ID 0255). OSHA therefore does not find it necessary to provide a new definition in the HCS. For the purposes of the HCS, OSHA believes there is no significant difference between ‘‘explosible dust-air mixture’’ and ‘‘combustible dust concentrations in air’’ and intends that these terms can be used interchangeably by label preparers. Further discussion on these terms can be found in OSHA Publication 3644–04, 2013, Firefighting Precautions at Facilities with Combustible Dust (available at https://
www.osha.gov/sites/default/files/ publications/OSHA_ 3644.pdf). 
AF&PA and AWC also supported the 
changes to paragraph C.4.31, noting that ‘‘The proposed hazard statements . . . are similar to existing OSHA guidance and represent a significant improvement over the current regulatory text’’ (Document ID 0287, p. 5). They also recommended clarifying edits to the footnote in C.4.31 regarding combustible dust: adding ‘‘1)’’ at the beginning of the footnote; reformatting the footnote to be three separate sentences instead of one; and adding the phrase ‘‘that follows the approach described’’ in the second numbered segment of the sentence to clarify that the sentence is not limited to wood, metal, and plastic items and whole grain. The text would then read ‘‘. . . the chemical manufacturer or importer shipping chemicals that are in a form that is not yet a dust must provide a label to customers that follows the approach described under paragraph (f)(4) of this section . . .’’ OSHA agrees that these edits clarify the text and has finalized the labeling provisions for combustible dust as AF&PA and AWC suggested. 
OSHA is making further revisions to 
Appendix C in response to comments 
which pointed out an oversight in the agency’s proposed revisions to the appendix. WHSP and an additional anonymous commenter noted that the ‘‘Corrosive to the respiratory tract’’ hazard statement that OSHA introduced in its proposal to add paragraph A.1.2.4 to Appendix A did not appear in Appendix C of the proposed standard. The commenters asked ‘‘what signal word, pictogram, and precautionary statements should appear on the SDS and label when the ‘Corrosive to the respiratory tract’ hazard statement is used?’’ (Document ID 0265; 0341, p. 39). As stated above in the Summary and Explanation for Appendix A, OSHA is adding a note to each of the relevant tables in Appendix C to clarify the labelling requirements related to new paragraph A.1.2.4. In accordance with the provisions of paragraph A.1.2.4 included in the final rule, OSHA is adding notes to Tables C.4.3, C.4.4,C.4.5 and C.4.11. 
First, OSHA added a note below Table 
C.4.3, Acute Toxicity—Inhalation, Categories 1 and 2 to indicate the required label elements for corrosive to the respiratory tract. The note requires that if the substance/mixture is determined to be corrosive to the respiratory tract leading to lethality, the corrosivity hazard must also be communicated with the corrosion pictogram and hazard statement ‘‘corrosive to the respiratory tract.’’ Second, OSHA added a note to Table C.4.4, Skin Corrosion/Irritation, Categories 1A to 1C. The note indicates that if the classifier determines, based on skin data, that the chemical may be corrosive to the respiratory tract, then the corrosivity hazard must be communicated with the hazard statement ‘‘corrosive to the respiratory tract’’ and the corrosion pictogram. (As instructed in Appendix C.2.3.4, pictograms may only appear once on a label. If multiple hazards require the use of the same pictogram, it may not appear a second time on the label.) Third, OSHA added a note below Table C.4.5, Eye damage/Irritation, Category 1, indicating that if a classifier determines that a chemical may be corrosive to the respiratory tract based on eye data, then the corrosivity hazard must be communicated with the hazard statement ‘‘corrosive to the respiratory tract’’ and the corrosion pictogram. Fourth, OSHA added a note below Table C.4.11, Specific Target Organ Toxicity (Single Exposure), Category 1. The note states that if the chemical is determined to be corrosive to the respiratory tract, corrosive to the respiratory tract must be communicated with the hazard statement ‘‘corrosive to the respiratory tract, if inhaled,’’ and the corrosivity pictogram in lieu of the current STOT hazard statement and health hazard pictogram. The hazard statement for corrosive to the respiratory tract under STOT SE, unlike the other corrosive to the respiratory tract statements, 
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includes ‘‘if inhaled’’ because A.8.2.1.2 
requires the relevant route(s) of exposure by which the classified substance produces damage to be identified. 
(A) Revisions to Precautionary 
Statements 
As mentioned in Rev. 7, A3.3.1.5 
(Document ID 0060, p. 301), the original GHS (Document ID 0215) precautionary statements were developed from existing classification systems, including the IPCS International Chemical Safety Card (ICSC) Compilers Guide, the American National 
Standards, the EU classification and labelling directives, the Emergency Response Guidebook, and EPA’s Pesticide Label Review Manual. Since OSHA’s 2012 updates to the HCS, the UNSCEGHS continued its ongoing review of the precautionary statements to ensure they are allocated to the correct hazard class and/or category, reduce redundancies, simplify and clarify the statements, and clarify and refine the conditions of use. This section discusses OSHA’s revisions to precautionary statements in Appendix C.4. As OSHA explained in the NPRM, the intent or reasons provided below for the changes it proposed in the NPRM (and is now finalizing) reflect OSHA’s agreement with explanations provided by the UNSCEGHS, unless otherwise specified. The changes are organized according to the column headings found in the C.4 tables ( i.e., prevention, 
response, storage, and disposal). 
(B) Changes in Prevention Column 
1. Wear Protective Equipment (e.g., 
Gloves/Protective Clothing) 
A precautionary statement for acute 
toxicity—dermal (all categories) (C.4.2), skin corrosion/irritation (Categories 1A to 1C and Category 2 (as outlined in Appendix C tables in the NPRM)) (C.4.4), eye damage/irritation (Categories 1 and 2A) (C.4.5), and sensitization—skin (C.4.7) specifies personal protective equipment, such as ‘‘wear protective gloves’’ or ‘‘wear eye protection/face protection.’’ OSHA proposed to revise the instruction accompanying ‘‘Wear protective gloves/ protective clothing,’’ which previously instructed the chemical manufacturer, importer, or distributor ‘‘to specify type of equipment.’’ The proposed instruction stated that the chemical manufacturer, importer, or distributor ‘‘may further specify type of equipment where appropriate’’ to align with Rev. 7 (Document ID 0060, pp. 347–348, 350– 351, 354). Cal/OSHA, AFSCME and Worksafe 
objected that, under the proposed 
version, producers would not be required to specify the types of PPE that are required to handle specific types of chemicals (Document ID 0322, p. 3; 0344, p. 3; 0354, p. 5; 0405, p. 18; 0424, Tr. 196–197). According to Cal/OSHA, the proposed revision ‘‘would leave workers who handle chemicals during shipment and at the point-of-use with less information about the type of gloves, protective garments, eyewear and other PPE needed to protect themselves from exposure, and it would complicate an emergency response to a loss of containment during 
transportation or use’’ (Document ID 
0322, p. 3). 
OSHA did not intend for the proposed 
revision to suggest that label preparers are no longer required to identify the specific types of PPE needed to protect employees. Rather, the proposed revision was to align with Rev. 7, A4.3.8.3.3. As explained there, ‘‘[s]pecial requirements may exist for gloves or other protective clothing to prevent skin, eye or lung exposure. Where relevant, this type of PPE should be clearly stated. For example, ‘PVC gloves’ or ‘nitrile rubber gloves’, and thickness and breakthrough time of the glove material’’ (Document ID 0060, p. 385). While this level of specificity is appropriate for some chemicals and 
mixtures, there are also chemicals and 
mixtures for which the more general prevention statement to wear protective gloves is adequate. OSHA’s intent in aligning with the GHS language is to continue to require the label preparer to specify the appropriate PPE and maintain the longstanding requirement of the HCS that label preparers must 
specify the type of protective gloves and/or equipment when a specific type (such as PVC or nitrile) must be used to protect workers. The label preparer may use a more general statement only when a specific type of PPE is not needed to protect workers. 
OSHA therefore agrees with Cal/ 
OSHA that the use of ‘‘may’’ in the proposed revision could be misinterpreted to mean that label preparers are not required to specify the type of gloves and clothing which will be protective whenever a specific type is needed for a given chemical or mixture. Accordingly, OSHA is amending the instruction accompanying ‘‘Wear protective gloves/protective clothing’’ in Appendix C to read ‘‘Chemical manufacturer, importer, or distributor to specify type of equipment where appropriate’’. OSHA added this 
statement to C.4.2, C.4.4, C.4.5 and C.4.7. OSHA also proposed to adopt a 
precautionary statement revision and 
instruction adding the term ‘‘/hearing protection . . .’’ for several hazard classes, in alignment with similar changes made in Rev. 7. In 2015, the 
UNSCEGHS noted that hearing protection should often be worn when 
handling explosives and other physical hazards, such as desensitized explosives, because an explosion would result in a potentially hazardous noise level (Document ID 0219). Accordingly, the UNSCEGHS revised the precautionary statement to read, ‘‘Wear protective gloves/protective clothing/ eye protection/face protection/hearing protection . . .’’ (Document ID 0147). Consistent with Rev. 7 (Document ID 0060, pp. 284–285), OSHA proposed to adopt this revised precautionary statement and instruction for germ cell mutagenicity (C.4.8), all categories; carcinogenicity (C.4.9), all categories; reproductive toxicity (C.4.10), all categories; explosives (C.4.14), unstable explosives and Divisions 1.1–1.5; flammable gases (C.4.15), Category 1A, pyrophoric; flammable liquids (C.4.19), all categories; flammable solids (C.4.20), all categories; self-reactive substances and mixtures (C.4.21), all categories; pyrophoric liquids (C.4.22), Category 1; pyrophoric solids (C.4.23), Category 1; self-heating substances and mixtures (C.4.24), all categories; substances and mixtures which, in contact with water, emit flammable gases (C.4.25), all categories; oxidizing liquids (C.4.26), all categories; oxidizing solids (C.4.27), all categories; organic peroxides (C.4.28), all categories; and desensitized explosives (proposed C.4.30), all categories. 
NIOSH commented that the addition 
of hearing protection to the list of PPE shown in the ‘prevention’ columns for the hazard classes of germ cell mutagenicity (C.4.8), carcinogenicity (C.4.9), and reproductive toxicity (C.4.10) ‘‘seems inappropriate because hearing protection will not protect against exposure to these hazardous substances’’ (Document ID 0281, p. 5). 
OSHA notes that the use of the 
backslash ‘‘/’’ as outlined in C.2.4.2 indicates that the label and SDS preparer can choose the appropriate phrases. OSHA agrees that hearing protection is not an appropriate recommendation for the hazard classes of germ cell mutagenicity (C.4.8), carcinogenicity (C.4.9), and reproductive toxicity (C.4.10), and would not expect that this would be included by label and SDS preparers for these hazard classes. Since OSHA does 
not believe hearing protection is appropriate for these hazards and in 
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order to minimize the misuse of this 
statement, OSHA is not adding the term ‘‘hearing protection’’ for those hazard classes. 
For C.4.15, Flammable Gases, NIOSH 
recommended adding PPE to include protective gloves/protective clothing/ eye protection/face protection’’ for Hazard Categories 1A, Chemically Unstable Gas A, and 1B, Chemically Unstable Gas B (Document ID 0281, Att. 2, p. 6). While OSHA updated the presentation of the hazard category for flammable gas it did not propose to make substantial changes to the actual statements required and therefore views these changes as out of scope. The only exceptions to this are the changes made to the prevention column for 1A pyrophoric gases, where PPE was added to address the specific hazard of pyrophoricity and that language mirrors the precautionary statements of pyrophoric solids and pyrophoric liquids, and it is thus not one of the categories NIOSH recommends making changes to. The agency also notes that PPE is not included in Rev. 7 for the hazard categories NIOSH indicated (Document ID 0060, pp. 307–309). However, label preparers can add additional statements they deem appropriate. 
NIOSH additionally recommended 
adding ‘‘respiratory protection’’ to the list of PPE shown in the prevention column for C.4.8 Germ Cell Mutagenicity, C.4.9 Carcinogenicity, and C.4.10 Reproductive Toxicity (Document ID 0281, Att. 2, p. 5). AFSCME similarly commented that since inhalation is a main route of entry when working with chemicals, respiratory protection language should be included in the PPE specifications in the tables that do currently list specific types of PPE (Document ID 0344, pp. 3– 4). NIOSH also suggested PPE-related changes for several hazard classes in which OSHA either did not propose any revision to the prevention column or did not propose any PPE-related revisions. NIOSH recommended adding PPE to include respiratory protection/ protective clothing/protective gloves to the prevention column for C.4.11 (Specific Target Organ Toxicity, Single Exposure) and C.4.12 (Specific Target Organ Toxicity, Repeated Exposure). For C.4.16, Aerosols, and C.4.17, Oxidizing Gases, NIOSH recommended adding PPE to include protective gloves/ protective clothing/eye protection/face protection to the prevention column. For C.4.18, Gases Under Pressure (compressed gas, liquified and dissolved gas), NIOSH recommended adding PPE 
to include eye protection/face protection (Document ID 0281, p. 6). Regarding NIOSH and AFSCME’s 
requests to add the term ‘‘respiratory 
protection’’ as an option in the PPE prevention column for Germ Cell Mutagenicity, Carcinogenicity, and Reproductive Toxicity, and in the prevention column for various other hazard classes, such a revision would be out of scope for this rulemaking since OSHA did not raise the possibility of 
adding ‘‘respiratory protection’’ to any 
of these PPE precautionary statements in the NPRM. However, OSHA notes that it is finalizing the ellipses that it proposed to include at the end of the lists of PPE in the prevention column for these hazards, which allows addition of other types of PPE (including respiratory protection) and which should be added if appropriate. With regard to the other types of PPE that NIOSH recommended adding, these changes too would be outside the scope of this rulemaking because they are unrelated to what OSHA proposed in the NPRM. 
Cal/OSHA commented that OSHA 
should strengthen the precautionary statements to indicate that the PPE is required and suggested the agency change the language to ‘‘Chemical manufacturer, importer, or distributor to specify the appropriate personal protective equipment as required’’ (Document ID 0322, Att. 2, p. 11–13). OSHA disagrees with Cal/OSHA’s suggested change. The precautionary statement indicates that PPE should be worn with the declarative statement of ‘‘Wear protective gloves/. . .’’ which makes clear what PPE is needed in order to safely use the chemical. Cal/OSHA’s suggested revision only changes the language around the duty of the label preparer to specify the details of the PPE, and in this case ‘‘as required’’ does not add strength to this requirement because the language already makes clear that the label preparer must specify the appropriate PPE. For these reasons, OSHA declines to alter the precautionary statement as Cal/OSHA suggests. 
For C.4.13, Aspiration Hazard, NIOSH 
recommended adding a statement that ‘‘Mouth pipetting is to be prohibited. When pipetting is required, use a pipette bulb or a mechanical device’’ (Document ID 0281, p. 6). While OSHA agrees this is sound laboratory practice, it was not discussed in the NPRM and would therefore be out of scope for this rulemaking. OSHA also notes that the suggested statement is not included in the GHS, and that 29 CFR 1910.1450, Occupational exposure to hazardous chemicals in laboratories, Appendix A, 
Paragraph E, provides a list of general procedures from the National Research Council for working with chemicals, including ‘‘Pipetting should never be done by mouth.’’ 
2. Avoid Contact During Pregnancy/ 
While Nursing 
In C.4.10, for reproductive toxicity 
(effects on or via lactation), OSHA proposed to revise a precautionary statement that said to avoid contact ‘‘during pregnancy/while nursing’’ so it would read ‘‘during pregnancy and while nursing’’. OSHA proposed this revision to clarify that the chemical label preparer is not to choose between ‘‘during pregnancy’’ and ‘‘while nursing’’ but is to include both scenarios on the label. OSHA also noted that the proposed change would align with Rev. 7 (Document ID 0060, p. 358). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
3. Do Not Handle Until All Safety 
Precautions Have Been Read and Understood 
For unstable explosives in C.4.14, 
OSHA proposed to delete a precautionary statement included in the 2012 HCS about not handling until all safety precautions have been read and understood. OSHA reasoned that a statement to obtain special instructions before use is already included and that statement is shorter and more relevant to safety. OSHA also noted that the proposed change would align with Rev. 7 (Document ID 0060, p. 304). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
4. Do Not Subject to Grinding/Shock/ 
Friction 
OSHA also proposed adding the 
precautionary statement ‘‘Do not subject to grinding/shock/friction/. . .’’ to the table for unstable explosives in C.4.14. As OSHA explained in the NPRM, that statement was already included for the other explosives categories in the HCS and is also relevant for unstable explosives. For each of the explosives categories that contain that statement, OSHA proposed to add an explanatory conditional note clarifying that the statement applies only if the explosive is mechanically sensitive. OSHA noted that these proposed changes would align with Rev. 7 (Document ID 0060, p. 304). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
5. Keep Away From Heat/Sparks/Open 
Flames/Hot Surfaces 
In the NPRM, OSHA noted that 
several of the hazard classes that 
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include flammable chemicals require 
precautionary statements and instructions about keeping away from ignition sources (heat/sparks/open flames/hot surfaces). Those statements generally require the label preparer to select one or more of the ignition sources listed, as applicable. OSHA proposed to include more ignition sources in the statement and to require that they all be listed on the label. The revised statement would read, ‘‘Keep away from heat, hot surfaces, sparks, open flames, and other ignition sources.’’ OSHA stated its belief that this change, which is consistent with Rev. 7 (Document ID 0060, p. 280), would improve hazard communication by making users aware of additional ignition sources that should be avoided. The change was proposed for 
precautionary statements for explosives 
(divisions 1.1–1.5 in C.4.14), flammable gases (C.4.15), aerosols (C.4.16), 
flammable liquids (C.4.19), flammable 
solids (C.4.20), self-reactive substances and mixtures (C.4.21), pyrophoric liquids (C.4.22), pyrophoric solids (C.4.23), oxidizing liquids (C.4.26), oxidizing solids (C.4.27), organic peroxides (C.4.28), and desensitized explosives (C.4.30). 
NPGA objected to the proposed 
change because it would require all ignition sources to be listed. NPGA commented that ‘‘the chemical manufacturer, importer or distributor is best equipped to determine which ignition sources should be listed. Further to this, it is not clear how this change improves safety to the level that it justifies the cost of redesigning, printing and relabeling all containers’’(Document ID 0364, p. 5). 
OSHA disagrees with NPGA that the 
chemical manufacturer, importer, or distributor would be best equipped to determine which ignition sources are relevant, since there may be ignition sources at worksites where the chemical is used that the manufacturer, importer, or distributor is unaware of. OSHA believes the value of this clarification is evident because expanding the list of potential ignition sources increases worker awareness of and protection from the variety of ignition sources that may be present at their worksite. Furthermore, due to the significant changes included in this final rule to several aspects of C.4.15, label preparers will already need to redesign these labels and print new ones. Therefore, this change alone does not specifically incur the costs that NPGA cites as either those costs would exist without the addition of this provision or are not 
costs due to other flexibilities provided. In addition, contrary to NPGA’s assertion, all containers would not need 
to be relabeled. OSHA is finalizing a new sentence in paragraph (f)(11) that allows manufacturers, importers, and distributors to not relabel containers that have already been released for shipment. For these reasons, OSHA disagrees with NPGA’s arguments and is finalizing these revisions as proposed. 
6. Keep Wetted With 
In the 2012 HCS a conditional 
instruction used for Divisions 1.1–1.3 
and 1.5 explosives in C.4.14 stated that the chemical manufacturer, importer, or distributer is to include the precautionary statement ‘‘Keep wetted with . . . ’’ under conditions where drying out would increase the explosion hazard, except as needed for manufacturing or operating processes. Rev. 7 changed the conditional instruction to clarify that the ‘‘Keep wetted with . . . ’’ statement should be used for ‘‘substances or mixtures which are wetted, diluted, dissolved or suspended with a phlegmatizer to reduce or suppress their explosive properties’’ (Document ID 0060, p. 305). OSHA proposed to make the same change in order to clarify when the ‘‘Keep wetted with . . . ’’ statement is appropriate. OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
OSHA further notes that the ‘‘Keep 
wetted with . . . ’’ precautionary 
statement also appears in C.4.30, desensitized explosives. Consistent with Rev. 7 (Document ID 0060, p. 334), OSHA did not propose to add the conditional statement that appears in C.4.14 because, by definition, desensitized explosives are phlegmatized to suppress their explosive properties, and therefore the ‘‘Keep wetted with . . . ’’ statement is appropriate for all desensitized explosives. 
7. Keep Only in Original Packaging 
OSHA proposed to revise the 
statement ‘‘Keep only in original 
container’’ to ‘‘Keep only in original packaging’’ for self-reactive substances and mixtures (C.4.21), organic peroxides (C.4.28), and corrosive to metals (C.4.29). OSHA also proposed that the revised statement would be added to explosives in Divisions 1.1–1.5 (C.4.14). OSHA reasoned that the proposed change in term is appropriate because the term ‘‘packaging’’ is more inclusive than ‘‘container’’ and would include the transport packaging as well as the immediate container. OSHA also noted that the proposed changes are consistent with Rev. 7 (Document ID 0060, p. 281). OSHA received no comments on these 
proposed revisions. Therefore, the agency is finalizing them as proposed. 
8. Ground and Bond Container and 
Receiving Equipment 
Several hazard classes require the 
precautionary statement ‘‘Ground/bond container and receiving equipment’’ for chemicals that are electrostatically sensitive. OSHA proposed changing ‘‘Ground/bond’’ to ‘‘Ground and bond’’ to clarify that both of those precautions are to be included on the label. C.2.4.2 states that when a ‘‘/’’ is used the label preparer has a choice and should choose the most appropriate phrase. However, in this case, both ‘‘ground’’ and ‘‘bond’’ should be stated together to appropriately protect against electrostatically sensitive chemicals. OSHA proposed making this change for explosives (Divisions 1.1 to 1.5 in C.4.14), flammable liquids (Categories 1 to 3 in C.4.19), and flammable solids (C.4.20). In addition, OSHA proposed to revise the conditional instructions to clarify that the need for grounding and bonding applies to flammable liquids only if they are volatile and may generate an explosive atmosphere (C.4.19) and to explosives and flammable solids only if they are electrostatically sensitive (C.4.14 and C.4.20). OSHA also proposed to add the ‘‘ground and bond’’ precautionary statement and similar conditional notes (‘‘if electrostatically sensitive and able to generate an explosive atmosphere’’) to self-reactive substances and mixtures (C.4.21) and organic peroxides (C.4.28) because the precaution is also appropriate for those hazard classes. OSHA noted that the proposed changes 
would align with Rev. 7 (Document ID 0060, p. 282). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
9. Keep Away From Clothing and Other 
Combustible Materials 
OSHA proposed to standardize 
precautionary statements regarding combustible materials for oxidizing chemicals. In the 2012 HCS, the tables for oxidizing gases (C.4.17), oxidizing liquids (C.4.26, hazard categories 2 and 3), and oxidizing solids (C.4.27, hazard categories 2 and 3) required the precautionary statement ‘‘Keep/Store away from clothing/ . . . /combustible materials,’’ along with instructions for the chemical manufacturer, importer, or distributor to specify incompatible materials. The table for Category 1 in C.4.26 required the precautionary statement ‘‘Keep/Store away from clothing and other combustible 
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materials.’’ OSHA proposed to change 
these statements to read: ‘‘Keep away from clothing and other combustible materials,’’ and to delete the instruction regarding incompatible materials, to make the statement consistent with the statement currently applicable to Category 1 in oxidizing solids (C.4.27). OSHA reasoned that the proposed change is appropriate because the general term‘‘combustible materials’’ encompasses any other materials that are incompatible with oxidizers. In addition, OSHA reasoned that the term ‘‘keep’’ is adequate to encompass storage as well as use, and that eliminating the choice between‘‘keep’’ and‘‘store’’ would avoid confusion and improve consistency. OSHA also proposed to remove the redundant statement‘‘Take any precaution to avoid 
mixing with combustibles/ . . . ’’ under 
oxidizing liquids (C.4.26) and oxidizing solids (C.4.27), since this information is 
duplicative of the ‘‘keep away from’’ 
statement. OSHA noted that the proposed changes would be consistent with Rev. 7 (Document ID 0060, p. 280). 
OSHA proposed to remove the‘‘Keep/ 
store away from clothing/ . . . /combustible materials’’ precautionary statement, along with its instruction, for self-reactive substances and mixtures (C.4.21) and organic peroxides (C.4.28). As OSHA explained in the NPRM, the wording of the precautionary statement is pertinent to oxidizing properties, which readily give oxygen or other oxidizing material, and therefore more readily support combustion. Neither self-reacting chemicals nor organic peroxides have oxidizing properties, so the statement is not appropriate for them. Both self-reacting chemicals and organic peroxides have alternate storage statements that are designed to more 
accurately address their particular chemical properties. OSHA noted these proposed changes would also align with Rev. 7 (Document ID 0060, pp. 318–320, 330–332). 
OSHA received no comments on these 
proposed revisions. Therefore, the agency is finalizing them as proposed. 
10. Keep Valves and Fittings Free From 
Oil and Grease 
For oxidizing gases (C.4.17), a 
precautionary statement in the 2012 HCS allowed the chemical manufacturer, importer, or distributor to specify that either ‘‘reduction valves’’ or ‘‘valves and fittings’’ be kept free from oil and grease. OSHA proposed to revise the statement to ‘‘Keep valves and fittings free from oil and grease.’’ OSHA reasoned that the change would be appropriate because all valves and fittings must be kept free of oil and grease, not just the reduction valves attached to pressure receptacles, and also noted it would be consistent with Rev. 7 (Document ID 0060, p. 312). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
11. Wear Cold Insulating Gloves/Face 
Shield/Eye Protection 
OSHA proposed to revise the 
precautionary statement for refrigerated liquefied gases (C.4.18), which in the 
2012 HCS required the use of either cold 
insulated gloves, a face shield, or eye protection. The revised precautionary statement reads ‘‘Wear cold insulating gloves and either face shield or eye protection.’’ OSHA proposed the change to clarify the intent of the precautionary statement, which is that cold-insulating gloves are to be used in addition to either a face shield or eye protection, and noted that it would align with Rev. 7 (Document ID 0060, p. 314). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
12. Keep Container Tightly Closed 
The precautionary statement ‘‘Keep 
container tightly closed’’ is used for 
flammable liquids (categories 1 to 3 in C.4.19). Rev. 7 contains a conditional instruction for flammable liquids indicating that the statement is to be used if the liquid is volatile and may generate an explosive atmosphere (Document ID 0060, p. 321). OSHA proposed to add this conditional instruction to the precautionary statement for flammable liquids (categories 1 to 3) because it clarifies the types of flammable liquids for which the statement applies. 
OSHA also proposed to add the 
precautionary statement ‘‘Keep container tightly closed’’ to pyrophoric liquids (C.4.22), pyrophoric solids (C.4.23), and desensitized explosives (new C.4.30) (as part of adopting the 
new hazard class of desensitized 
explosives). OSHA reasoned that it is 
important to add that statement because 
for both pyrophoric liquids and pyrophoric solids it is necessary to avoid ignition via contact with air. Because the precaution applies to all chemicals in these hazard classes, OSHA preliminarily determined that a conditional note is not necessary. The agency noted that these proposed changes would also align with Rev. 7 (Document ID 0060, p. 281). 
OSHA received no comments on these 
proposed revisions. Therefore, the agency is finalizing them as proposed. 13. Take Precautionary Measures Against Static Discharge 
For flammable liquids (C.4.19, Hazard 
Categories 1 to 3), OSHA proposed to 
revise the precautionary statement ‘‘Take precautionary measures against static discharge’’ to ‘‘Take action to prevent static discharge.’’ As explained in the NPRM, the proposed revision would simply shorten the statement and clarify what action needs to be taken. OSHA also proposed to add a note that this precautionary statement is to be used if the liquid is volatile and may generate an explosive atmosphere. OSHA noted that these proposed changes are consistent with Rev. 7 (Document ID 0060, p. 315). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
14. Flammable Liquids/Solids 
Precautionary Statements and Conditional Instructions 
OSHA proposed additional 
conditional instructions for flammable liquids (C.4.19) and flammable solids (C.4.20). For some categories of flammable liquids (Categories 1 to 3) and flammable solids (categories 1 and 2), OSHA proposed to modify one of the precautionary statements to add square brackets in the phrase ‘‘Use explosion- proof [electrical/ventilating/lighting/ . . .] equipment.’’ As OSHA explained in the NPRM, the agency believes that SDS and label creators are not properly and specifically identifying the prevention measures for the particular chemical, but rather are listing the entire line without the required details, and the brackets are intended to help clarify this issue. For both liquids and solids, OSHA proposed adding a conditional instruction to indicate that the text in square brackets may be used to specify specific electrical, ventilating, lighting, or other equipment if necessary and as appropriate. For liquids, OSHA also proposed a new conditional instruction to clarify that the statement is required if the chemical is volatile and may generate an explosive atmosphere. OSHA noted that these proposed changes would align with Rev. 7 (Document ID 0060, p. 282). 
OSHA also proposed to add a 
conditional instruction to the precautionary statement to use non- sparking tools for flammable liquids (C.4.19, categories 1 to 3). The statement would clarify that the precautionary statement is only needed if the liquid is volatile and may generate an explosive atmosphere, and if the minimum ignition energy is very low (<0.1 mJ). The precautionary statement has very 
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limited applicability for flammable 
liquids and therefore OSHA reasoned that the conditions need to be specified. OSHA noted that this proposed change is also consistent with Rev. 7 (Document ID 0060, p. 315). 
OSHA received no comments on these 
changes to the precautionary statements and additional conditional instructions it proposed for flammable liquids (C.4.19) and flammable solids (C.4.20). Therefore, the agency is finalizing them as proposed. 
15. Keep Cool 
For self-reactive substances and 
mixtures (C.4.21) and organic peroxides 
(C.4.28), OSHA proposed to move the precautionary statement ‘‘Keep cool’’ from the storage column to the prevention column. OSHA reasoned that the precautionary statement is not needed in the storage column because that column includes a precautionary statement about storage temperatures not to be exceeded under storage conditions, and as discussed below, OSHA also proposed to add conditional instructions to that column to inform users of when a storage temperature would need to be listed. To ensure that the chemicals are kept at appropriate temperatures at all times (not just during storage), OSHA proposed to place ‘‘Keep cool’’ in the prevention column; but OSHA also proposed to include a conditional instruction indicating that the precautionary statement may be omitted if storage temperatures are included on the label. The agency noted that the proposed revision would not materially change the information that is presented on the label and is consistent with Rev. 7 (Document ID 0060, pp. 318–320, 330– 332). 
For self-heating substances and 
mixtures (C.4.24), a combined precautionary statement included in the 2012 HCS instructed the user to keep 
cool and protect from sunlight. OSHA proposed that a conditional instruction be added to indicate that ‘‘Keep cool’’ can be omitted where storage temperatures are listed on the label. Because ‘‘Protect from sunlight’’ still needs to be included if specific storage temperatures are listed on the label, OSHA proposed to delete the combined statement under the prevention column, and to list only ‘‘Keep cool’’ (and the new conditional instruction) in that column. The statement: ‘‘Protect from sunlight’’ would be moved to the storage column, similar to the way this is handled for other hazard classes. OSHA reasoned that these proposed changes would provide the label preparer better instructions and would provide the appropriate level of information on the 
label without repetition. OSHA noted that the proposed changes would also align with Rev. 7 (Document ID 0060, p. 323). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
16. Do Not Allow Contact With 
OSHA proposed to add the 
conditional note ‘‘if emphasis of the 
hazard statement is deemed necessary’’ to precautionary statements indicating that contact is not to be allowed with air (for proposed Category 1A, pyrophoric 
gases (C.4.15), pyrophoric liquids 
(C.4.22), and pyrophoric solids (C.4.23)) or water (for substances and mixtures which, in contact with water, emit flammable gases (C.4.25, categories 1 and 2)). Because the hazard phrases, which are also included on labels for these categories, already warn about the hazards of these respective chemicals when they contact air or water, OSHA reasoned that adding this precautionary statement as well could be repetitive. However, depending on the specific chemical, the label preparer may feel that added emphasis is warranted. OSHA noted that these proposed changes would align with Rev. 7 (Document ID 0060, p. 280). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
17. Handle and Store Contents Under 
Inert Gas 
For substances and mixtures which, 
in contact with water, emit flammable gases (C.4.25, all categories), OSHA proposed changing the precautionary statement ‘‘Handle under inert gas. Protect from moisture’’ to ‘‘Handle and store contents under inert gas/. . . 
Protect from moisture’’ to clarify that 
these substances should always be 
under inert atmospheres. In addition, 
OSHA proposed to add conditional instructions to indicate that if the substance or mixture reacts readily with moisture in air, then the chemical manufacturer, importer or distributer must also specify the appropriate liquid or gas if inert gas is not appropriate. As explained in the NPRM, OSHA anticipated the new statement would provide greater clarity and is needed because inert gas is not appropriate in some cases (e.g., white phosphorus 
should be handled and stored under water) (86 FR 9717). The agency noted that this proposed change is also consistent with Rev. 7 (Document ID 0060, pp. 324–325). 
OSHA also proposed to add the 
statement ‘‘Handle and store contents under inert gas/. . . ’’ to pyrophoric liquids (C.4.22) and pyrophoric solids 
(C.4.23) and a conditional statement would note that the manufacturer, importer, or distributor is to specify the appropriate liquid or gas if inert gas is not appropriate. As explained in the NPRM, pyrophoric chemicals, by definition, are likely to ignite when in contact with air. Both C.4.22 and C.4.23 of the 2012 HCS contained the following statement in the storage column: ‘‘Store contents under . . . Chemical manufacturer, importer, or distributor to specify appropriate liquid or inert gas.’’ In light of the language OSHA proposed to include in the prevention column, OSHA proposed to delete this language from the storage column. OSHA reasoned that the language it proposed for the prevention column would emphasize that pyrophoric chemicals must be handled, as well as stored, under inert atmospheres. OSHA noted that the statements it proposed to add to the prevention column for C.4.22 (pyrophoric liquids) and C.4.23 (pyrophoric solids) regarding handling and storing contents under inert gas were included in Table A3.2.2 of Rev. 7 but were inadvertently left off of tables in Annex 3, Section 3 for both pyrophoric liquids and pyrophoric solids (Document ID 0060, p. 281). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
18. Wear Fire Resistant or Flame 
Retardant Clothing 
Category 1 oxidizing liquids (C.4.26) 
and Category 1 oxidizing solids (C.4.27) of the 2012 HCS had the precautionary statement ‘‘Wear fire/flame resistant/ retardant clothing.’’ That statement was 
intended to alert the users of the chemical that they should wear either fire resistant or flame retardant clothing, not for the label preparer to choose between the terms ‘‘fire’’ and ‘‘flame’’ or ‘‘resistant’’ and ‘‘retardant’’. Therefore, OSHA proposed to replace the 2012 HCS statement with ‘‘Wear fire resistant or flame retardant clothing’’ in order clarify OSHA’s intent. The agency also noted that the proposed change is consistent with Rev. 7 (Document ID 0060, p. 285). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
19. Changes in Response Column 
Several of the revisions OSHA 
proposed for the response column are 
simply editorial changes intended to improve clarity, correct simple omissions of a word or phrase, or more efficiently and concisely combine different precautionary statements. For 
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example, OSHA proposed to add the 
phrase ‘‘If on skin’’ to the statement ‘‘Brush off loose particles from skin’’ (see C.4.23 (pyrophoric solids) and hazard categories 1 and 2 in C.4.25 (substances and mixtures which, in contact with water, emit flammable gasses)) because those statements are always combined in Rev. 7 (Document ID 0060, pp. 293–294), and the additional phrase would add clarity. In a number of cases, OSHA proposed to reorganize the precautionary statements and to remove redundant wording to improve clarity. For example, in C.4.14, instead of listing the individual statements and providing conditions of use, OSHA proposed to list the statements grouped together (except for materials for Division 1.4S, which have another set of statements as explained 
below). 
The following discussion does not 
address changes that are simply 
editorial in nature (although, as 
discussed above, OSHA will make available a redline version of Appendix C on OSHA’s website ( https://
www.osha.gov/dsg/hazcom). The discussion below highlights substantive changes to the response column in Appendix C. 
20. Rinse Skin With Water [or Shower] 
The HCS 2012 precautionary 
statements for Categories 1A to 1C of 
skin corrosion/irritation (C.4.4) and 
Categories 1 to 3 of flammable liquids (C.4.19) indicated that if the chemical is on hair or skin, the affected individual is to immediately take off all contaminated clothing and rinse skin with ‘‘water/shower.’’ OSHA proposed to revise the statement to instruct the affected individual to rinse skin with ‘‘water [or shower],’’ and to add a conditional note indicating that the text in square brackets is to be used where the chemical manufacturer, importer or distributor considers it appropriate for the specific chemical. OSHA reasoned that a deluge shower might be most appropriate for the chemical, and the use of the square brackets allows for selection of the most appropriate wording. OSHA also noted that the proposed change would align with Rev. 7 (Document ID 0060, p. 289). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
21. Get Medical Advice/Attention 
In the 2012 HCS, a number of health 
hazards (i.e., skin corrosion/irritation 
(Category 2 in C.4.4), eye damage/ 
irritation (Categories 2A and 2B in C.4.5), sensitization—skin (C.4.7), germ cell mutagenicity (C.4.8), carcinogenicity (C.4.9), reproductive 
toxicity (C.4.10), specific target organ toxicity—repeated exposure (C.4.12), and refrigerated liquefied gases (C.4.18)) had combined precautionary statements that included the statement ‘‘get medical advice/attention.’’ OSHA proposed to add an instruction indicating that the chemical 
manufacturer, importer, or distributer is 
to select medical advice or attention as appropriate in order to alert label preparers that they should provide more specific instruction on the type of medical assistance needed based on the chemical hazard and to align with Rev. 7 (Document ID 0060, p. 287). 
ACC disagreed with the mandatory 
addition of the requirement to choose between medical advice or medical attention, stating that it would provide no added benefit to those handling the chemical and that it would be costly for companies required to modify the statement (Document ID 0347, pp. 19– 20). 
OSHA disagrees with ACC’s assertion 
that a requirement to select medical advice or attention would not benefit those handling the chemical. Getting medical attention in response to a toxic exposure indicates that in-person evaluation is required, while getting medical advice indicates that consultation may take place by remote means. There may be situations in which it is always more appropriate for an exposed worker to seek in-person evaluation and therefore clarifying between attention and advice is substantively different and conveys important information to workers. OSHA also finds this is not an overly burdensome requirement, given the importance of specifying whether medical attention or medical advice is required following exposure. OSHA also 
notes that Rev. 8 has replaced all medical precautionary statements that included ‘‘advice/attention’’ with statements that provide more detailed instructions. As was discussed above, OSHA is aligning with Rev. 7 in this and most other updates to the HCS, but will allow the use of precautionary statements included in Rev. 8. OSHA is therefore finalizing this revision as proposed. 
22. If Inhaled: Remove Person to Fresh 
Air and Keep Comfortable for Breathing 
A precautionary statement used for 
sensitization—respiratory (C.4.6) in the 2012 HCS stated ‘‘If inhaled: If breathing is difficult, remove person to fresh air and keep comfortable for breathing.’’ OSHA proposed to remove the phrase ‘‘if breathing is difficult,’’ reasoning that including two conditions, ‘‘if inhaled’’ and ‘‘if breathing is difficult,’’ is 
confusing and unnecessary. OSHA also noted that removing the phrase would make the precautionary statement consistent with the statement as it appears in other hazard classes in Appendix C.4, such as acute toxicity— inhalation (C.4.3) and would be consistent with Rev. 7 (Document ID 0060, p. 353). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
23. Take Off Contaminated Clothing and 
Wash It Before Reuse 
A precautionary statement for skin 
sensitization (C.4.7) in the 2012 HCS said to wash contaminated clothing before reuse. OSHA proposed to add the phrase ‘‘Take off contaminated clothing and’’ to this precautionary statement. As explained in the NPRM, the phrase was inadvertently omitted for skin 
sensitization in Rev. 3 (Document ID 0085, Att. 7), and therefore in the updates to the HCS in 2012 as well, but it has since been added to Rev. 7 (Document ID 0060, p. 293). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
24. If Exposed or Concerned 
For specific target organ toxicity 
(single exposure) (C.4.11), OSHA 
proposed to revise a precautionary statement indicating ‘‘If exposed’’ to ‘‘If exposed or concerned.’’ OSHA reasoned that the revision, which would be consistent with language already used for the germ cell mutagenicity (C.4.8), carcinogenicity (C.4.9), and reproductive toxicity (C.4.10) hazard classes, would maintain consistency throughout C.4 and with Rev. 7 (Document ID 0060, p. 360). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
V. Division 1.4 Explosives (C.4.14) 
Precautionary Statements 
For Division 1.4 explosives, the HCS 
provides fire-fighting precautionary statements and instructions on when to apply them (C.4.14). OSHA proposed two changes to these statements. First, OSHA proposed to change the instructional note from ‘‘except if explosives are 1.4S ammunition and components thereof’’ to ‘‘except for explosives of division 1.4 (compatibility group S) in transport packaging’’ to provide clarity about when the note applies; there is no intended change in meaning. Second, OSHA proposed to revise the precautionary statement ‘‘Fight fire with normal precautions 
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from a reasonable distance’’ to the 
statement ‘‘Fight fire remotely due to the risk of explosion.’’ OSHA reasoned that the proposed new statement would be more appropriate and protective because it specifies the explosion risk due to fire associated with Division 1.4 (Compatibility Group S) explosives. OSHA also noted that these proposed changes would align with Rev. 7 (Document ID 0060, p. 306). OSHA received no comments on these revisions, and is therefore finalizing them as proposed. 
Toby Threet commented that OSHA 
should revise another precautionary statement which appears in C.4.14 as well as other categories: ‘‘Do NOT fight fire when fire reaches explosives.’’ According to Threet, this statement ‘‘implies that it is OK to fight the fire until almost the very moment when the fire reaches the explosives . . . Fire . . . can ignite things, even if the fire ( i.e., 
the flame) has not ‘reached’ them yet.’’ Threet suggested ‘‘Stop fighting fire before it nears explosives’’ and ‘‘Leave the area before fire nears explosives’’ as alternatives to the existing language (Document ID 0279, p. 23–24). 
OSHA notes that the existing 
precautionary statement was adopted from the GHS in 2012 and OSHA did not propose to modify it in the NPRM. Threet’s suggestion to change it is therefore outside the scope of this rulemaking. Furthermore, updates to the GHS have not changed this precautionary statement (Document ID 0060, p. 306) and OSHA is not aware of any confusion regarding the meaning of this statement or any incidents where misinterpretation of this statement has caused harm to workers. OSHA therefore has not accepted Threet’s recommendation. 
(A) Eliminate All Ignition Sources, if 
Safe To Do So 
For flammable gases (C.4.15), a 
precautionary statement in the 2012 
HCS instructed the user to ‘‘Eliminate all ignition sources if safe to do so.’’ OSHA proposed to revise the statement to ‘‘In case of leakage, eliminate all ignition sources’’ by adding the phrase ‘‘in case of leakage’’ to stress the dangers of flammable gas leaks, even where the leaking gas is not yet burning, because the leak could create an explosive atmosphere; and by deleting the term ‘‘if safe to do so’’ because it could discourage quick action. OSHA reasoned that eliminating gas leaks or ignition sources would not be expected where a fire would hinder that action. OSHA also proposed to add this statement to all of the new flammable gas categories it proposed in the NPRM. OSHA noted that these proposed changes would be consistent with Rev. 7 (Document ID 0060, pp. 307–309). 
Toby Threet commented regarding the 
precautionary statement ‘‘In case of leakage, eliminate all ignition sources’’ that eliminating ignition sources may require a person to enter a hazardous area and suggested that the statement should be ‘‘In case of leakage, eliminate all ignition sources if safe to do so’’ (Document ID 0279, p. 24). 
As discussed above, OSHA proposed 
to delete the phrase ‘‘if safe to do so’’ because it could discourage quick action. OSHA believes that removing the phrase ‘‘if safe to do so’’ will not cause workers to enter a hazardous area in order to eliminate ignition sources. OSHA believes that workers will have training on the safe use and handling of chemicals under OSHA regulations such as the HCS, as well as the requirement under the PSM standard to implement an emergency action plan, which must include procedures for handling small releases (29 CFR 1910.119(n)). Additionally, OSHA’s regulations for hazardous waste operations and emergency response ensure that workers will be made aware of dangers related to gas leaks and the work practices that will minimize risks from these hazards (see 29 CFR 1910.120 and 1926.65). OSHA concludes that these additional regulatory requirements will ensure that employees do not place themselves in harm’s way in the event of a gas leak, particularly where there is a source of ignition present. Therefore, OSHA has not included ‘‘if safe to do so’’ in the precautionary statement. 
For the reasons discussed above, 
OSHA is finalizing the changes to the precautionary statement regarding 
eliminating ignition sources in case of 
flammable gas leaks as proposed. 
(B) Type A and B Self-Reactive 
Substances and Mixtures (C.4.21) 
For Type A self-reactive substances 
and mixtures (C.4.21), OSHA proposed 
to delete the precautionary statements 
‘‘In case of fire use . . . to extinguish’’ (along with its explanatory note) and ‘‘Fight fire remotely due to the risk of explosion.’’ In place of the statements OSHA proposed to delete, OSHA proposed to add the statement ‘‘In case of fire: Explosion risk. Evacuate area. DO NOT fight fire when fire reaches explosives.’’ OSHA explained that it proposed these changes because it is dangerous to fight a fire involving this type of material so individuals should always be advised against it, and noted that these changes would align with Rev. 7 (Document ID 0060, p. 318). For Type B self-reactive substances 
and mixtures (C.4.21), OSHA proposed 
to combine existing precautionary statements and to delete duplicate phrases that would occur with the new combination. As noted in the NPRM, OSHA did not intend these changes to alter the meaning of the statements. OSHA proposed to use brackets around the statement ‘‘Use . . . to extinguish’’ with a conditional note to indicate that the text in square brackets is to be included if water increases risk, in order to preserve the conditions of use with the new combination of phrases. OSHA noted that these proposed changes would align with Rev. 7 (Document ID 0060, p. 319). 
OSHA received no comments on these 
proposed revisions. Therefore, the agency is finalizing them as proposed. 
(C) Fire and Explosion Hazards for 
Organic Peroxides (C.4.28) 
Precautionary statements and 
instructions related to fire and explosion hazards or fire-fighting procedures were not included in Rev. 3 (Document ID 0085, Att. 7, pp. 65–67) or in the 2012 HCS for organic peroxides (C.4.28). The UNSCEGHS has since adopted these precautionary statements (Document ID 0060, pp. 330– 332). OSHA proposed to adopt the Rev. 7 precautionary statements in the response column for organic peroxides as for self-reactive substances and 
mixtures (C.4.21). OSHA reasoned that it is appropriate to include these statements for organic peroxides, as well as for self-reactive substances and mixtures, because the fire and explosion hazards of the two classes of compounds are equivalent (Document ID 0095). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
(D) Immerse in Cool Water or Wrap in 
Wet Bandages 
For pyrophoric liquids (C.4.22), 
pyrophoric solids (C.4.23), and categories 1 and 2 of substances and mixtures which in contact with water emit flammable gases (C.4.25), a precautionary statement in the 2012 HCS indicated that if the substance is on the skin, the user should ‘‘immerse in cool water/wrap with wet bandages.’’ For pyrophoric liquids (C.4.22) and solids (C.4.23), OSHA proposed to change the forward slash to an ‘‘or’’ and the ‘‘with’’ to ‘‘in’’ so that the statement would read ‘‘Immerse in cool water or wrap in wet bandages’’ in order to make clear that the chemical manufacturer, importer, or distributer is not to choose one action or the other but is to include both actions on the label. In the case of 
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substances and mixtures which, in 
contact with water, emit flammable gases (C.4.25), OSHA proposed to delete ‘‘/wrap in wet bandages’’ from the statement so that the complete statement reads ‘‘Brush off loose particles from skin and immerse in cool water.’’ OSHA reasoned that, for these chemicals, a large volume of water is needed and wrapping in wet bandages is not enough to address problems caused by the heat of the reaction. OSHA also noted that the proposed changes would align with Rev. 7 (Document ID 0060, p. 324). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
(E) Changes in Storage Column 
1. Store Separately 
For self-reactive substances and 
mixtures (C.4.21), self-heating 
substances and mixtures (C.4.24), and organic peroxides (C.4.28), OSHA proposed to revise the precautionary statement ‘‘Store away from other materials’’ to ‘‘Store separately.’’ OSHA reasoned that the revised statement is preferable because it is shorter and more appropriate. OSHA also proposed to add the ‘‘Store separately’’ precautionary statement to Category 1 oxidizing liquids (C.4.26) and Category 1 oxidizing solids (C.4.27) because those chemicals are not compatible with other chemicals and thus must be stored separately. OSHA noted that these proposed changes are consistent with Rev. 7 (Document ID 0060, p. 297). OSHA received no comments on these proposed revisions. Therefore, the agency is finalizing them as proposed. 
2. Store Contents Under . . . 
OSHA proposed to delete a 
precautionary statement that says ‘‘Store 
contents under . . . ’’ and an instructional note that the chemical manufacturer, importer, or distributer is to specify the appropriate liquid or inert gas which were previously in pyrophoric liquids (C.4.22) and solids (C.4.23). The UNSCEGHS recommended that the statement be deleted from the storage column because it adopted the statement ‘‘Handle and store contents under inert gas/ . . . , ’’ along with a similar instructional note, in the prevention column (Document ID 0152, p. 46). OSHA reasoned that placing the statement in the prevention column would be more appropriate, as there it would warn the downstream user that pyrophoric chemicals must be under inert gas not only during storage but at all times, including during processing and use. OSHA received no comments on this proposed revision. Therefore, 
the agency is finalizing it as proposed. 
3. Maintain Air Gap Between Stacks or 
Pallets 
For self-heating substances and 
mixtures (C.4.24), OSHA proposed to revise the precautionary statement that currently says ‘‘Maintain air gap between stacks/pallets’’ so it reads instead ‘‘Maintain air gap between stacks or pallets’’ in order to clarify that chemical label preparers are not to choose between ‘‘stacks’’ or ‘‘pallets’’ but are to include both words on the 
label. OSHA noted that this proposed 
change would align with Rev. 7 (Document ID 0060, p. 323). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
4. Store in Corrosion Resistant/ . . . 
Container With a Resistant Inner Liner 
A precautionary statement for the 
corrosive to metals (C.4.29) class in the 2012 HCS said to store in a ‘‘corrosive resistant/ . . . container with a resistant inner liner.’’ OSHA proposed to change the word ‘‘corrosive’’ to ‘‘corrosion’’ because it is the technically correct term. In addition, OSHA proposed to insert a new conditional instruction to indicate that the precautionary statement may be omitted if the statement ‘‘Keep only in original packaging’’ is included on the label. OSHA reasoned that this would eliminate the redundancy of including both statements. OSHA noted that these proposed changes would align with Rev. 7 (Document ID 0060, p. 333). OSHA received no comments on this proposed revision. Therefore, the agency is finalizing it as proposed. 
(F) Additional Instructional Notes 
For acute toxicity—inhalation (C.4.3) 
(category 1–3) and specific organ 
toxicity (single exposure, category 3) (C.4.11), OSHA proposed minor, non- substantive edits to the conditional instruction for precautionary statements about keeping the container tightly closed and storing in a well-ventilated place. OSHA proposed to revise the note from ‘‘if product is volatile so as to generate hazardous atmosphere’’ to ‘‘if the chemical is volatile and may generate a hazardous atmosphere.’’ The agency intended these edits is to improve clarity and make the instruction more consistent with a newly added instruction for flammable liquids (C.4.19). OSHA noted that this proposed change would be consistent with Rev. 7 (Document ID 0060, p. 281). 
For flammable liquids (C.4.19), OSHA 
proposed to add a clarifying instruction indicating that the precautionary 
statement ‘‘Store in a well-ventilated place. Keep cool’’ applies to flammable liquids in Category 1 and other flammable liquids that are volatile and may generate an explosive atmosphere. However, for Category 4 flammable liquids, OSHA proposed to delete ‘‘Keep cool,’’ because these liquids are less volatile and have a flashpoint above 60 ° 
C and therefore are unlikely to generate a hazardous concentration of vapor during storage. OSHA stated in the NPRM its preliminary finding that the precautionary statement ‘‘Store in a well ventilated place’’ would provide the appropriate level of protection, and noted that these proposed changes would align with Rev. 7 (Document ID 0060, pp. 315–316). 
For explosives (C.4.14), OSHA 
proposed minor edits to precautionary statements and instructions for storing in accordance with local/regional/ national/international regulations to clarify that the chemical manufacturer, importer, or distributer is to specify the contents of the applicable regulations. OSHA noted that these proposed changes would be consistent with Rev. 7 (Document ID 0060, p. 295). APA expressed concern that this would 
require responsible parties to list regulations regarding the storage of explosives from every country, district, region, and municipality in the world, and that ‘‘Shipping internationally would not only become a nightmare for the manufacturer/creator of the SDS but impossible.’’ They also asked that OSHA consider allowing manufacturers to just list the storage information for the country of origin of the manufacturer instead, along with a statement that customers should consult their local regulations (Document ID 0337, pp. 3–4). 
OSHA does not believe the proposed 
requirements are as burdensome as the APA suggests. First, although APA framed this as an issue regarding the SDS, the disposal requirements they point to in Appendix C are only required on labels. OSHA is not suggesting that label preparers need to address any regulations outside of the United States and thus the breadth of what is required is much narrower than what APA suggested. The agency has provided guidance indicating that when chemicals are prepared for direct shipment to a destination outside of the U.S. and are placed inside of a DOT or other similarly-approved shipping container, the manufacturer can label the sealed containers for the destination 
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country (HCS labeling of imports and 
exports, 2015, available at https://
www.osha.gov/laws-regs/standardinterpretations/2015-09-10). Additionally, OSHA is not suggesting that the label preparer needs to include every state, local, or federal regulation. Rather, they must include the content of the storage requirements, and since explosives are heavily regulated, for instance under OSHA 29 CFR 1910.109 as well as ATF 27 CFR 555 subpart K, OSHA does not anticipate that storage requirements will vary widely across states and localities in the United States, so label preparers may only need to include federal requirements or a few additional state or local requirements in addition to the federal requirements. OSHA also believes that producers of highly hazardous materials, such as 
explosives, already have programs in 
place to instruct their customers on how to safely ship, use, store and dispose of 
explosives in the United States, and 
therefore can readily identify state and local storage regulations that may differ from federal regulations. For these reasons, OSHA declines to accept APA’s alternative suggestion for this language. 
The 2012 HCS Appendix C sections 
on aerosols (C.4.16), self-reactive substances (C.4.21), self-heating substances and mixtures (C.4.24), and organic peroxides (C.4.28) included precautionary statements addressing storage temperatures not to be exceeded, with temperatures listed in degrees Celsius/Fahrenheit. The GHS added an instruction that the chemical manufacturer should use the applicable temperature scale for the region they are supplying (Document ID 0060, p. 297). In other OSHA standards, the primary temperature scale used is Fahrenheit. Therefore, OSHA proposed to require only the Fahrenheit scale in the precautionary statements, but to allow the chemical manufacturer, importer or distributor to include the temperature in Celsius (as noted by the parentheses ‘‘( )’’ around °C) in addition to the required temperature in Fahrenheit. 
In addition, for self-reactive 
substances and mixtures (C.4.21) and organic peroxides (C.4.28), OSHA proposed to add conditional instructions to two precautionary statements. The first conditional instruction was proposed to clarify that the statement to store in a well- ventilated place should not be used for temperature controlled self-reactive substances and mixtures or organic peroxides because condensation and consequent freezing may occur. The second was proposed to clarify that a 
storage temperature is only needed if temperature control is required or deemed necessary. OSHA noted that 
these proposed changes would align with Rev. 7 (Document ID 0060, pp. 295, 297). 
OSHA received no comments on these 
proposed revisions, other than the comment on storage of explosives. Therefore, the agency is finalizing them 
as proposed. 
VI. Changes in Disposal Column 
For most of the health and physical 
hazards addressed by Appendix C, the 
HCS includes a precautionary statement to dispose of contents/container in accordance with local/regional/ national/international regulations (to be specified). OSHA proposed to add an instructional note in all relevant places in the appendix indicating that the chemical manufacturer, importer, or distributor is to specify whether the disposal requirements apply to the contents, the container, or both. OSHA noted that this proposed change would align with Rev. 7 (Document ID 0060, pp. 298–299). 
ACC disagreed with the proposed 
instructional note to the disposal precautionary statement. They urged OSHA ‘‘to retain flexibility,’’ noting that some of their members’ use disposal precautionary statements that are more general and asserting that there is ‘‘no added benefit to whomever is handling the chemical by specifying if the phrase applies to the contents and/or container’’ (Document ID 0347, p. 19). OSHA disagrees. Workers need to know whether they need to exercise the same level of caution when disposing of the contents and the container. Without 
such specificity, workers confront ambiguous messaging that may put them at greater risk if they do not understand what is intended. The agency is therefore finalizing this change as proposed. 
OSHA also proposed to revise the 
precautionary note for disposal of explosives (C.4.14). The 2012 HCS tables for explosives (C.4.14), except for hazard category division 1.6, included a precautionary statement to dispose of contents/container in accordance with local/regional/national/international regulations (to be specified). However, as explained in the NPRM, this precautionary statement may not give users the information needed to safely 
dispose of explosives, particularly 
malfunctioning, expired, or non-used 
explosives where special care is needed. 
OSHA found this issue to be of 
particular concern for explosives such 
as fireworks, signal flares, and 
ammunition. Poorly formulated advice 
on the label may lead to the disposal of 
such explosive waste in a way that poses a risk to the workers that handle the waste (Document ID 0156). Therefore, OSHA proposed to change the precautionary note for explosives (C.4.14) to read: ‘‘Refer to manufacturer, importer, or distributor . . . for information on disposal, recovery, or recycling’’ and to add an instructional note to indicate that the chemical manufacturer, importer, or distributor is to specify the appropriate source of information, in accordance with local/ regional/national/international regulations as applicable. OSHA proposed this change to address the recycling or recovery of unexploded fireworks or other unused explosive cartridges and signal flares, which can result in unsafe conditions and should only be performed by specialists. OSHA noted that this proposed change is consistent with Rev. 7 (Document ID 0060, p. 299). 
APA raised the same concerns with 
regards to OSHA’s proposed revision to the disposal precautionary note for explosives as it did on the storage precautionary statement and also suggested that manufacturers should instead provide information for storage and disposal for the country where the manufacturer is located and then alert customers and recipients of the products on the SDS to consult local regulations for proper storage and disposal (Document ID 0337, pp. 3–4). 
OSHA disagrees that this proposal 
creates a new, unwieldy burden for manufacturers. The intent of this language was to clarify requirements, not create a new one. Label preparers were already required to provide this information in the disposal column, and OSHA is not aware of any concerns raised by other regulated parties regarding this requirement or its feasibility. Therefore, OSHA disagrees with APA’s suggested revision, which the agency believes would put undue burden on the downstream users and could be confusing to them, and is finalizing the changes to the disposal column for explosives as proposed. 
(A) GHS Revisions That OSHA Is Not 
Adopting 
Rev. 7 includes a small number of 
revisions that OSHA did not propose to adopt for this update to Appendix C. In general, OSHA did not propose to adopt any statements or conditional instructions that address consumer products because the HCS does not cover communication of hazards to consumers. This section discusses other specific provisions in Rev. 7 (Document ID 0060) that OSHA did not propose to adopt. 
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In the HCS, a number of tables for 
inhalation hazards in Appendix C.4 
(i.e., acute toxicity—inhalation (C.4.3, Categories 3 and 4), respiratory sensitization (C.4.6), skin sensitization (C.4.7), and specific target organ toxicity—single exposure (C.4.11, Category 3)) contain a precautionary statement that says ‘‘Avoid breathing dust/fume/gas/mist/vapors/spray.’’ A conditional note in Rev. 7 (Document ID 0060, p. 283) indicates that this precautionary statement is not needed where the precautionary statement ‘‘Do not breathe dust/mist/fume/gas/vapors/ spray’’ is included on the label. Also, for skin corrosion/irritation (C.4.4, Category 2), Rev. 7 contains a conditional note indicating that the statement ‘‘If skin irritation occurs: Get medical advice/ attention’’ may be omitted if the statement ‘‘If skin irritation or rash occurs: Get medical advice or treatment’’ is used (Document ID 0060, p. 292). OSHA did not propose to adopt these conditional instructions because it believes that the rules in C.2.4 regarding precautionary statement text provide the necessary flexibility. The agency received no comments on its decision not to include these conditional instructions in the HCS. 
In Rev. 7, the precautionary 
statements used in flammable liquids (C.4.19) and flammable solids (C.4.20) about explosion-proof equipment and taking action to prevent static discharge include a conditional instruction indicating that these precautionary statements can be omitted if national or local legislation contains provisions that are more specific (Document ID 0060, p. 282). OSHA did not propose to adopt this instruction because the agency believes these precautionary statements contain important information that should always be included on labels. Although some OSHA and consensus standards address the use of explosion- proof equipment and preventing static discharge for flammable liquids or solids, they do not address hazard communication. Therefore, OSHA does not believe they are specific enough to justify omitting the relevant precautionary statement from labels. Label preparers can add more specific supplementary information from standards as long as it complies with paragraph C.3. For example, they may reference OSHA’s flammable liquids standard (29 CFR 1910.106), which addresses the requirements for electrical equipment in workplaces that store or handle flammable liquids. OSHA received no comments on its preliminary decision not to include this conditional instruction in the HCS. Under the HCS, a precautionary 
statement for gases under pressure 
(C.4.18) currently says ‘‘Protect from sunlight.’’ Rev. 7 contains a conditional instruction indicating that this precautionary statement ‘‘may be omitted for gases filled in transportable gas cylinders in accordance with packing instruction P200 of the UN Recommendations on the Transport of Dangerous Goods, Model Regulations, unless those gases are subject to (slow) 
decomposition or polymerization, or the competent authority provides 
otherwise’’ (Document ID 0060, p. 313). These special packaging instructions are not applicable to cylinders used in the United States; therefore, OSHA did not propose to add this conditional instruction to C.4.18. OSHA received no comments on its preliminary decision not to include this conditional instruction in the HCS. OSHA has therefore decided not to include these revisions. 
F. Appendix D 
Appendix D provides specific 
requirements for what information 
chemical manufacturers, distributors, importers, and employers must provide on the SDS, including rules regarding specific headings, sub-headings, and information to be contained under each subheading. The information specified as mandatory in Appendix D is the minimum required information on the SDS, however, an SDS may include additional information as long as it does not contradict or undermine the required SDS elements. 
In the NPRM, OSHA proposed several 
changes in Appendix D to align with Rev. 7, clarify existing requirements about which stakeholders have expressed confusion, and ensure consistency with updated scientific principles (86 FR 9576; Document ID 0060, pp. 377–399). 
I. Introductory Text 
In the introductory section of 
Appendix D, OSHA proposed to add a 
sentence stating that ‘‘[w]hile each section of the SDS must contain all of the specified information, preparers of safety data sheets are not required to 
present the information in any 
particular order within each section.’’ 
OSHA proposed this change to clarify 
the existing text. As the information within each section can be listed in any order, OSHA noted that it did not 
anticipate any increased burden on SDS 
preparers from this change. 
API commented that the proposed 
revision could be helpful, especially in 
light of other changes OSHA proposed 
regarding the presentation of physical and chemical properties elsewhere on 
the SDS (Document ID 0316, p. 27). Similarly, Michele Sullivan supported the proposal and commented that the proposed clarification would provide flexibility (Document ID 0366, p. 8). OSHA received no comments objecting to the proposed clarification, and is therefore finalizing the addition of the proposed sentence to the introductory paragraph of Appendix D. 
II. Section 1: Identification 
Section 1 of Table D.1 requires SDS 
preparers to provide identifying 
information. In the NPRM, OSHA proposed to clarify that the address and telephone number of the chemical manufacturer, importer, or other responsible party which the HCS requires must be United States domestic. 
API and NAIMA supported the 
proposed revision (Document ID 0316, p. 27; 0338, p. 9; 0366, p. 8). Michele Sullivan also supported it, and stated that it would be helpful to clarify that the address and phone number provided in the SDS must be in the United States since there has been confusion about this in the past (Document ID 0366, p. 8). 
ACC sought clarification on how this 
revision would impact foreign suppliers and inquired what the options would be for a foreign supplier who ships products into the United States to comply with this provision. In addition, ACC recommended that OSHA make this requirement non-mandatory ‘‘due to length and complexity of the chemicals supply chain’’ (Document ID 0347, p. 21). NACD commented that the proposed revision would present challenges for foreign suppliers who are not willing to have U.S. addresses and 
phone numbers, which would in turn require importers to generate a new SDS with their own U.S. address and phone number and assume the liability for all the information in the SDS. However, NACD also pointed out that having a U.S. address and phone number on the SDS would be consistent with labeling requirements specified in Appendix C and could help demonstrate to foreign suppliers and importers that this is required (Document ID 0329, pp. 7–8). 
OSHA disagrees that the proposed 
language would impose new burdens on either foreign suppliers or domestic importers. As OSHA discussed in the NPRM, a U.S. telephone number and U.S. address were already required on the SDS based on the previously existing requirements of Appendix D, which requires that the name, address, and telephone number of the responsible party, such as the chemical manufacturer or importer, be listed on 
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the SDS (86 FR 9722). OSHA explained 
in a 2016 LOI that when chemicals are imported into the United States, the importer (defined by the HCS as being the first business with employees in the United States to receive hazardous chemicals produced in other countries for distribution in the United States) is the responsible party for purposes of compliance with the HCS and is required to use a U.S. address and U.S. phone number on the SDS (Document ID 0090). 
Therefore, in response to ACC’s 
question and NACD’s concern regarding foreign suppliers, OSHA notes that foreign companies that ship products to importers in the United States are not required to maintain U.S. contact information or to include their address and telephone number on the SDS. Furthermore, NACD’s comment that importers must include their own U.S. address and phone number on the SDS and must assume responsibility for information in the SDS is correct, but is not a new burden associated with OSHA’s proposed change. 
OSHA believes it is important to 
codify the requirement for a U.S. telephone number and U.S. address in Section 1 of Table D.1 in the text of the HCS to minimize any further confusion. This change would clarify the existing requirement, which—as comments received by the agency demonstrate— continues to be a point of confusion in cases where hazardous chemicals are imported to the United States. ACC’s request to make the inclusion of a U.S. phone number and address non- mandatory would conflict with the pre- existing requirement as explained in the 2016 interpretation discussed above, adding to rather than mitigating stakeholder confusion. OSHA is therefore finalizing the proposed 
revision to clarify that the address and telephone number of the chemical manufacturer, importer, or other responsible party which the HCS requires in Section 1 of the SDS must be United States domestic. 
III. Section 2: Hazard(s) Identification 
In Section 2, Hazard(s) identification, 
OSHA proposed to clarify where and 
how chemical hazard information should be presented. First, OSHA proposed to clarify that Section 2 (a) must include any hazards associated with a change in the chemical’s physical form under normal conditions of use. OSHA also proposed a new Section 2 (c) to clarify that hazards identified under normal conditions of use that result from a chemical reaction (changing the chemical structure of the original substance or mixture) needed to be included. To accommodate the new 
proposed Section 2 (c), OSHA proposed to move existing Section 2 (c) and (d) to Section 2 (d) and (e). 
As OSHA noted in the NPRM, the 
proposed revisions to Section 2 would require hazards associated with chemicals as shipped, as well as hazards associated with a change in the chemical’s physical form under normal conditions of use, to be presented in 
Section 2 (a), and new hazards created 
by a chemical reaction under normal conditions of use to be presented in Section 2 (c). OSHA believed this would sufficiently differentiate the different types of hazards presented under normal conditions of use. OSHA sought stakeholder comments on this issue. 
After reviewing stakeholders’ 
comments pertaining to proposed changes in paragraph (d)(1), OSHA made significant changes to proposed paragraph (d) and made related changes to proposed Appendix D requirements for Table D.1 Section 2 of the SDS. As previously described in the Summary and Explanation for paragraph (d)(1), OSHA removed the terms ‘‘under normal conditions of use and foreseeable emergencies’’ from paragraph (d)(1). In the final rule, paragraph (d)(1) has two subparagraphs, indicating that hazard classification must include hazards associated with the chemical’s intrinsic properties including: (i) a change in the chemical’s physical form and; (ii) chemical reaction products associated with known or reasonably anticipated uses or applications. 
To align with these changes to 
paragraph (d)(1), in Section 2 (a), OSHA replaced its original proposed language with ‘‘in accordance with paragraph (d)(1)(i) of § 1910.1200.’’ OSHA also removed the proposed language from Section 2 (c) and replaced it with ‘‘Hazards classified under paragraph (d)(1)(ii) of § 1910.1200.’’ The new language in these two paragraphs clarifies OSHA’s intentions and fully 
aligns Appendix D with paragraph (d)(1) so that there is no conflict between those two sections that would create 
confusion. Further discussion of the 
scope of these requirements and 
comments regarding these changes that 
were not specific to the language in Section 2 can be found in the Summary and Explanation for paragraph (d). 
OSHA received several comments 
specific to the proposed changes to Section 2 of Table D.1. NIOSH and Ameren supported the proposed changes (Document ID 0281, Att. 2, p. 6; 0309, p. 13). ACC commented that the proposed change to paragraph (d)(1) used the words ‘‘hazard classification shall include . . .’’, but the original 
proposed Section 2 (c) in Table D.1 only said ‘‘Hazards identified under normal conditions of use. . . .’’, without referring to classification. ACC found the proposed language unclear as to whether manufacturers and importers need to classify for reaction hazards, or just mention them in Section 2 of the SDS (Document ID 0347, p. 21). As noted above, OSHA is changing Section 2 (c) to begin with ‘‘Hazards classified 
under paragraph (d)(1)(ii) . . .’’ (emphasis added) to clarify this issue and better align Section 2 with paragraph (d)(1). 
An anonymous commenter asked 
whether hazardous substances formed by chemical reactions under normal conditions of use must be disclosed in Section 3 and/or Section 8 of the SDS (Document ID 0267). For situations where hazardous substances form during use but the substance is not present in its hazardous state in the mixture as shipped, manufacturers are not required to provide this information in Sections 3 or 8 because the resulting hazardous substance is not an ingredient or constituent. However, as discussed in a 2016 LOI, OSHA expects manufacturers to include information on substances formed by chemical reactions in Sections 2 and 10 (available at https://www.osha.gov/laws-regs/
standardinterpretations/2016-05-20 ). 
OSHA notes that this requires the inclusion of occupational exposure limits, including PELs and TLVs, under Section 10 (d): Conditions to Avoid. 
The High Temperature Industrial 
Wool Coalition (HTIW) urged OSHA to allow hazards from a downstream chemical reaction to be addressed in Section 16 of the SDS, rather than Section 2, in cases ‘‘where the nature of the hazard is unclear, and the potential [hazard] is extremely limited’’ (Document ID 0330, p. 3). By way of example, HTIW explained that glassy refractory ceramic fibers (RCF) do not contain crystalline silica, but that depending on the duration and temperature of exposure, fiber chemistry, and/or the presence of fluxing agents or furnace contaminants, devitrifying RCF may form crystalline silica dust in amounts which HTIW said were usually undetectable in the furnace conditions. HTIW stated that they believe the evidence is not sufficient to list RCF as a hazard in Section 2 of the SDS. They noted that ‘‘the possibility of hazard is discussed in Section 16, which addresses other potential issues’’ and opined that in this case, inclusion of after-service RCF in 
Section 2 of the SDS would ‘‘overemphasize the potential hazard, 
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