G/TBT/N/USA/1775  
13 September 2021  
(21-6730) Page: 1/2 
Committee on Technical Barriers to Trade  Original:  English  
 
  
NOTIFICATION  
The following notification is being circulated in accordance with Article 10.6  
 
1. Notifying Member:  UNITED STATES OF AMERICA   
If applicable, name of local government involved (Article 3.2 and 7.2):   
2. Agency responsible:  Environmental Protection Agency (EPA) [1804]  
Name and address (including telephone and fax numbers , email and website 
addresses, if available) of agency or authority designated to handle comments 
regarding the notification shall be indicated i f different from above:   
Please submit comments to: USA WTO TBT Enquiry Point, Email: usatbtep@nist.gov  
3. Notified under Article 2.9.2 [   ], 2.10.1 [   ], 5.6.2 [   ], 5.7.1 [   ], other  [X]:  
4. Products covered (HS or CCCN where applicable, otherwise national tariff 
heading. ICS numbers may be provided in addition, where applicable):  
Octamethylcyclotetra -Siloxane (D4), risk evaluation; Environmental protection (ICS 
13.020), Protection against dangerous go ods (ICS 13.300), Production in the chemical 
industry (ICS 71.020), Products of the chemical industry (ICS 71.100)  
5. Title, number of pages and language(s) of the notified document:  
Octamethylcyclotetra -Siloxane (D4); Draft Scope of the Risk Evaluation T o Be Conducted 
Under the Toxic Substances Control Act; Notice of Availability and Request for Comments 
(2 page(s), in English)  
6. Description of content:   
Notice of Availability and Request for Comments - In accordance with implementing 
regulations for th e Toxic Substances Control Act (TSCA), the Environmental Protection 
Agency (EPA) is announcing the availability of and soliciting public comment on the draft 
scope of the risk evaluation to be conducted for octamethylcyclotetra -siloxane (D4). D4 
(Cyclotetr asiloxane, 2,2,4,4,6,6,8,8 -octamethyl -; Chemical Abstracts Service Registry 
Number (CASRN) 556 -67-2), is a chemical substance for which EPA received a 
manufacturer request for risk evaluation. The draft scope for this chemical substance 
includes the condit ions of use, hazards, exposures, and the potentially exposed or 
susceptible subpopulations that EPA plans to consider in conducting the risk evaluation 
for this chemical substance. EPA is also opening a 45 -calendar day comment period on 
the draft scope to allow for the public to provide additional data or information that could 
be useful to the Agency in finalizing the scope of the risk evaluation; comments may be 
submitted to this docket.   
7. Objective and rationale, including the nature of urgent problems where 
applicable:  Prevention of deceptive practices and consumer protection; Protection of 
human health or safety; Protection of the environment  G/TBT/N/USA/1775  
 
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  8. Relevant documents:   
86 Federal Register (FR) 50347, 8 September  2021:  
https://www.govinfo.gov/content/pkg/FR -2021-09-08/html/2021 -19392.htm  
https://www.govinf o.gov/content/pkg/FR -2021-09-08/pdf/2021 -19392.pdf  
This notice is identified by Docket Number EPA -HQ-OPPT-2018-0443. The Docket Folder 
is available on Regulations.gov at https://www.regulations.gov/docket/EPA -HQ-OPPT-
2018-0443/document  and provides access to primary and supporting documents as well 
as comments received. Documents are also accessible from Regulations.gov  by searching 
the Docket Number. WTO Members and their stakeholders are asked to submit comments 
to the USA TBT Enquiry Point . Comments received by the USA TBT Enquiry Point from 
WTO Members and their stakeholders will be shared with the regulator and will also be 
submitted to the Docket  on Regulations.gov if received within the comment period.  
9. Proposed date of adoption:  To be determined  
Proposed date of entry into force:  To be determined  
10. Final date for comments:  25 October 2021  
11. Texts available from:  National enquiry point [ ] or address, telephone and fax 
numbers and email and website addresses, if available , of other body:   
https://members.wto.org/crnattachments/2021/TBT/USA/21_5709_ 00_e.pdf