Occupational Safety and Health Admin., Labor 

(4) The employer shall promptly determine and document an appropriate 

response to each of the findings of the 

compliance audit, and document that 

deficiencies have been corrected. 

(5) Employers shall retain the two (2) 

most recent compliance audit reports. 

(p) Trade secrets. (1) Employers shall 

make all information necessary to 

comply with the section available to 

those persons responsible for compiling 

the process safety information (required by paragraph (d) of this section), 

those assisting in the development of 

the process hazard analysis (required 

by paragraph (e) of this section), those 

responsible for developing the operating procedures (required by paragraph (f) of this section), and those involved in incident investigations (required by paragraph (m} of this section), emergency planning and response 

(paragraph (n} of this section) and compliance audits (paragraph (o) of this 

section) without regard to possible 

trade secret status of such information. (2) Nothing in this paragraph shall 

preclude the employer from requiring 

the persons to whom the information is 

made available under paragraph (p}(1 ) 

of this section to enter into confidentiality agreements not to disclose the 

information as set forth in 29 CFR 

1910.1200. 

(3) Subject to the rules and procedures set forth in 29 CFR 1910.1200(i)(l) 

through 1910.1200(i}(l2), employees and 

their designated representatives shall 

have access to trade secret information 

contained within the process hazard 

analysis and other documents required 

to be developed by this standard. 

APPENDIX A TO §1910.119-LIST OF HIGHLY 

HAZARDOUS CHEMICALS, TOXICS AND 

REACTIVE$ (MANDATORY) 

This appendix contains a listing of toxic 

and reactive highly hazardous chemicals 

which present a potential for a catastrophic 

event at or above the threshold quantity. 

CHEMICAL name 

Acetaldehyde . 

Acrolein (2-Propenal) 

Acrylyl Chloride 

Allyl Chloride 

Allylamine . 

Alkylaluminums . 

Ammonia, Anhydrous . 

Ammonia solutions (>44% ammonia 

by weight) 

CAS" TO" 

75-()7-Q 2500 

107-Q2-8 150 

8t4-6!H; 250 

107-Q5-1 1000 

107-11-9 1000 

Varies 5000 

7664-41-7 1 0000 

7664-41-7 15000 

CHEMICAL name 

Ammonium Perchlorate . 

Ammonium Permanganate . 

Arsine (also called Arsenic Hydride) . 

Bis(Chloromethyl) Ether ... 

Boron Trichloride . 

Boron Trifluoride .... ............. ............... . 

Bromine .. 

Bromine Chloride . 

Bromine Pentafluoride . 

Bromine Trifluoride ... 

3-Bromopropyne (also called Pro· 

pargyl Bromide) 

Butyl Hydroperoxide (Tertiary) . 

Butyl Perbenzoate (Tertiary) . 

Carbonyl Chloride (see Phosgene) . 

Carbonyl Fluoride . 

Cellulose Nitrate (concentration 

> 12.6% nitrogen . 

Chlorine ...................... .. . 

Chlorine Dioxide . 

Chlorine Pentrafluoride . 

Chlorine Trifluoride . 

Chlorodiethylaluminum (also called 

Diethylaluminum Chloride) . 

1-Chloro·2.4·Dinitrobenzene . 

Chloromethyl Methyl Ether . 

Chloropicrin 

Chloropicrin and Methyl Bromide mixture . 

Chloropicrin and Methyl Chloride mixture .. 

Cumene Hydroperoxide 

Cyanogen . 

Cyanogen Chloride .. 

Cyanuric Fluoride . 

Diacetyl Peroxide (Concentration 

>70%) . 

Diazomethane 

Dibenzoyl Peroxide 

Diborane . 

Dibutyl Peroxide (Tertiary) 

Dichiara Acetylene 

Dichlorosilane . 

Diethylzinc ... 

Diisopropyl Peroxydicarbonate . 

Dilaluroyl Peroxide 

Oimethyldichlorosilane . 

Dimethylhydrazine. 1,1· ... 

Oimethylamine, Anhydrous 

2,4-Dinitroaniline ............. . 

Ethyl Methyl Ketone Peroxide (also 

Methyl Ethyl Ketone PeroXIde; concentration >60%) . 

Ethyl Nitrite .. 

Ethylamine . 

Ethylene Fluorohydrin 

Ethylene Oxide . 

Ethyleneimine . 

Fluorine . 

Formaldehyde (Formalin) .. 

Furan ..... 

Hexafluoroacetone 

Hydrochloric Acid, Anhydrous . 

Hydrofluoric Acid, Anhydrous . 

Hydrogen Bromide 

Hydrogen Chloride 

Hydrogen Cyanide, Anhydrous . 

Hydrogen Fluoride .. 

Hydrogen Peroxide (52% by weight or 

greater) 

Hydrogen Selenide . 

Hydrogen Sulfide ... 

Hydroxylamine . 

Iron. Pentacarbonyl 

361 

§ 1910.119 

CAS' 

779()-9S...9 

7787-36-2 

7784-42-1 

542-8S...1 

10294-34-5 

7637-07-2 

7726-95-6 

13863-41-7 

778~3()-2 

7787-71-5 

106-96-7 

75-91-2 

614-4SC-9 

75-44-5 

353-50-4 

9004-70-Q 

7782-5()-5 

10049-Q4-4 

13637-83-3 

7790-91-2 

96-1<H> 

97-Q()-7 

107-3()-2 

76-o6-2 

None 

None 

8()-15-9 

46()-1~5 

506-77-4 

675-14-9 

11()-22-5 

334-8S...3 

94-36-Q 

19287-45-7 

11 0-Q5-4 

7572-29-4 

410~96-Q 

557-20-Q 

105-64-6 

105-74-8 

75-7S...5 

57-14-7 

124-40-3 

97-Q2-9 

1338-23-4 

10~95-5 

75-()4-7 

371-82-Q 

75-21-8 

151-56-4 

7782-41-4 

5()..{)()-{) 

110-Q()-9 

684-16-2 

7647-01-Q 

7684-3~3 

10035-1<H> 

7647-Q1-Q 

74-9<H> 

7684-3~3 

7722-84-1 

7783-07-5 

7783-06-4 

7803-49-8 

13463-4<H> 

To·· 

7500 

7500 

100 

100 

2500 

250 

1500 

1500 

2500 

15000 

100 

5000 

7500 

100 

2500 

2500 

t 500 

1000 

1000 

1000 

5000 

5000 

500 

500 

1500 

1500 

5000 

2500 

500 

100 

5000 

500 

7500 

100 

5000 

250 

2500 

10000 

7500 

7500 

1000 

1000 

2500 

5000 

5000 

5000 

7500 

100 

5000 

1000 

1000 

1000 

500 

5000 

5000 

1000 

5000 

5000 

1000 

1000 

7500 

150 

1500 

2500 

250 
§ 1910.1 19 

CHEMICAL name 

lsopropylamine . 

Ketene 

Melhacrylaldehyde 

Methacryloyl Chloride ... 

Methacryloyloxyethyl Isocyanate . 

Methyl Acrylonitrile 

Methylamine, Anhydrous .. 

Methyl Bromide 

Methyl Chloride 

Methyl Chloroformate . 

Methyl Ethyl Ketone Peroxide (concentration >60%) . 

Methyl Fluoroacetate . 

Methyl Fluorosulfate . 

Methyl Hydrazine . 

Methyl Iodide . 

Methyl Isocyanate 

Methyl Mercaptan . 

Methyl Vinyl Ketone 

Methyltrichlorosilane . 

Nickel Carbonly (Nickel Tetracarbonyl) 

Nitric Acid (94.5% by weight or greater) . 

Nitric Oxide . 

Nitroaniline (para Nitroaniline . 

Nitromethane . 

Nitrogen Dioxide . 

Nitrogen Oxides (NO; NO,; N204; 

N203) 

Nitrogen Tetroxide (also called Nitrogen Peroxide) 

Nitrogen Trifluoride . 

Nitrogen Trioxide . 

Oleum (65% to 80% by weight; also 

called Fuming Sulfuric Acid) . 

Osmium Tetroxide . 

Oxygen Difluoride (Fluorine Monoxide) 

Ozone . 

Pentaborane . 

Peracetic Acid (concentration >60% 

Acetic Acid; also called Peroxyacetic Acid 

CAS' 

75--31-{) 

463-51-4 

7fHl5-3 

920-4&--7 

30674-8G-7 

12&--9&--7 

74-8~5 

74-83-9 

74-87-3 

7~22-1 

1338-23-4 

453-tB-9 

421-2G-5 

6G-34-4 

74-88-4 

624-83-9 

74-93-1 

7~84-4 

75--78-6 

13463-3~3 

7697-37-2 

10102-43-9 

100-{)1--{; 

75--52-5 

101 02-44-{) 

1 01 02-44-{) 

1 0544-72--{; 

7783-54-2 

10544-73-7 

8014-95--7 

2081&--12-{) 

7783-41-7 

10028-15--{; 

19624-22-7 

7~21-{) 

TO" 

5000 

100 

1000 

150 

100 

250 

1000 

2500 

15000 

500 

5000 

100 

100 

100 

7500 

250 

5000 

100 

500 

150 

500 

250 

5000 

2500 

250 

250 

250 

5000 

250 

1,000 

100 

100 

100 

100 

1000 

29 CFR Ch. XVII (7-1-14 Edition) 

CHEMICAL name 

Perchloric Acid (concentration >60% 

by weight) 

Perchloromethyl Mercaptan 

Perchloryl Fluoride 

Peroxyacetic Acid (concentration 

>60% Acetic Acid; also called Peracetic Acid) 

Phosgene (also called Carbonyl Chloride) . 

Phosphine (Hydrogen Phosphide) 

Phosphorus Oxychloride (also called 

Phosphoryl Chloride) 

Phosphorus Trichloride 

Phosphoryl Chloride (also called 

Phosphorus Oxychloride) 

Propargyl Bromide . 

Propyl Nitrate . 

Sarin .............................. . 

Selenium Hexafluoride 

Stibine (Antimony Hydride) 

Sulfur Dioxide (liquid) . 

Sulfur Pentatluoride . 

Sulfur Tetrafluoride . 

Sulfur Trioxide (also called Sulfuric 

Anhydride) . 

Sulfuric Anhydride (also called Sulfur 

Trioxide) . 

Tellurium Hexafluoride 

Tetrafluoroethylene . .. ................ .. 

Tetrafluorohydrazine . 

T etramethyl Lead 

Thionyl Chloride 

Trichloro (chloromethyl) Silane 

Trichloro (dichlorophenyl) Silane ... 

Trichlorosilane . 

Trifluorochloroethylene . 

Trimethyoxysilane ... 

·chemical Abstract Se1V1ce Number. 

CAS' 

7601-9G-3 

594-42-3 

761&--94-8 

7~21-{) 

75-44-5 

7803-51-2 

1 0025--{;7-3 

77 ~12-2 

1 0025--{;7-3 

10&--9&--7 

627-3-4 

107-44-8 

7783-7~1 

7803-52-3 

7446-{)~5 

5714-22-7 

7783--{;0-{) 

744&--11-9 

744&--11-9 

7783-80-4 

11&--14-3 

1003&--47-2 

75--74-1 

7719-{)~7 

1558-25-4 

27137-85--5 

10025--78-2 

7~38-9 

2487-9G-3 

TO" 

5000 

150 

5000 

1000 

100 

100 

1000 

1000 

1000 

100 

2500 

100 

1000 

500 

1000 

250 

250 

1000 

1000 

250 

5000 

5000 

1000 

250 

100 

2500 

5000 

10000 

1500 

.. Threshold Quantity in Pounds (Amount necessary to be 

covered by this standard). 

362