• Part Number:
    1910
  • Part Number Title:
    Occupational Safety and Health Standards
  • Subpart:
    1910 Subpart H
  • Subpart Title:
    Hazardous Materials
  • Standard Number:
  • Title:
    List of Highly Hazardous Chemicals, Toxics and Reactives (Mandatory).
  • GPO Source:

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 CAS* TQ**
Acetaldehyde 75-07-0 2500
Acrolein (2-Propenal) 107-02-8 150
Acrylyl Chloride 814-68-6 250
Allyl Chloride 107-05-1 1000
Allylamine 107-11-9 1000
Alkylaluminums Varies 5000
Ammonia, Anhydrous 7664-41-7 10000
Ammonia solutions (>44% ammonia by weight) 7664-41-7 15000
Ammonium Perchlorate 7790-98-9 7500
Ammonium Permanganate 7787-36-2 7500
Arsine (also called Arsenic Hydride) 7784-42-1 100
Bis(Chloromethyl) Ether 542-88-1 100
Boron Trichloride 10294-34-5 2500
Boron Trifluoride 7637-07-2 250
Bromine 7726-95-6 1500
Bromine Chloride 13863-41-7 1500
Bromine Pentafluoride 7789-30-2 2500
Bromine Trifluoride 7787-71-5 15000
3-Bromopropyne (also called Propargyl Bromide) 106-96-7 100
Butyl Hydroperoxide (Tertiary) 75-91-2 5000
Butyl Perbenzoate (Tertiary) 614-45-9 7500
Carbonyl Chloride (see Phosgene) 75-44-5 100
Carbonyl Fluoride 353-50-4 2500
Cellulose Nitrate (concentration >12.6% nitrogen 9004-70-0 2500
Chlorine 7782-50-5 1500
Chlorine Dioxide 10049-04-4 1000
Chlorine Pentrafluoride 13637-63-3 1000
Chlorine Trifluoride 7790-91-2 1000
Chlorodiethylaluminum (also called Diethylaluminum Chloride) 96-10-6 5000
1-Chloro-2,4-Dinitrobenzene 97-00-7 5000
Chloromethyl Methyl Ether 107-30-2 500
Chloropicrin 76-06-2 500
Chloropicrin and Methyl Bromide mixture None 1500
Chloropicrin and Methyl Chloride mixture None 1500
Cumene Hydroperoxide 80-15-9 5000
Cyanogen 460-19-5 2500
Cyanogen Chloride 506-77-4 500
Cyanuric Fluoride 675-14-9 100
Diacetyl Peroxide (Concentration >70%) 110-22-5 5000
Diazomethane 334-88-3 500
Dibenzoyl Peroxide 94-36-0 7500
Diborane 19287-45-7 100
Dibutyl Peroxide (Tertiary) 110-05-4 5000
Dichloro Acetylene 7572-29-4 250
Dichlorosilane 4109-96-0 2500
Diethylzinc 557-20-0 10000
Diisopropyl Peroxydicarbonate 105-64-6 7500
Dilaluroyl Peroxide 105-74-8 7500
Dimethyldichlorosilane 75-78-5 1000
Dimethylhydrazine, 1,1- 57-14-7 1000
Dimethylamine, Anhydrous 124-40-3 2500
2,4-Dinitroaniline 97-02-9 5000
Ethyl Methyl Ketone Peroxide (also Methyl Ethyl Ketone Peroxide; concentration >60%) 1338-23-4 5000
Ethyl Nitrite 109-95-5 5000
Ethylamine 75-04-7 7500
Ethylene Fluorohydrin 371-62-0 100
Ethylene Oxide 75-21-8 5000
Ethyleneimine 151-56-4 1000
Fluorine 7782-41-4 1000
Formaldehyde (Formalin) 50-00-0 1000
Furan 110-00-9 500
Hexafluoroacetone 684-16-2 5000
Hydrochloric Acid, Anhydrous 7647-01-0 5000
Hydrofluoric Acid, Anhydrous 7664-39-3 1000
Hydrogen Bromide 10035-10-6 5000
Hydrogen Chloride 7647-01-0 5000
Hydrogen Cyanide, Anhydrous 74-90-8 1000
Hydrogen Fluoride 7664-39-3 1000
Hydrogen Peroxide (52% by weight or greater) 7722-84-1 7500
Hydrogen Selenide 7783-07-5 150
Hydrogen Sulfide 7783-06-4 1500
Hydroxylamine 7803-49-8 2500
Iron, Pentacarbonyl 13463-40-6 250
Isopropylamine 75-31-0 5000
Ketene 463-51-4 100
Methacrylaldehyde 78-85-3 1000
Methacryloyl Chloride 920-46-7 150
Methacryloyloxyethyl Isocyanate 30674-80-7 100
Methyl Acrylonitrile 126-98-7 250
Methylamine, Anhydrous 74-89-5 1000
Methyl Bromide 74-83-9 2500
Methyl Chloride 74-87-3 15000
Methyl Chloroformate 79-22-1 500
Methyl Ethyl Ketone Peroxide (concentration >60%) 1338-23-4 5000
Methyl Fluoroacetate 453-18-9 100
Methyl Fluorosulfate 421-20-5 100
Methyl Hydrazine 60-34-4 100
Methyl Iodide 74-88-4 7500
Methyl Isocyanate 624-83-9 250
Methyl Mercaptan 74-93-1 5000
Methyl Vinyl Ketone 79-84-4 100
Methyltrichlorosilane 75-79-6 500
Nickel Carbonly (Nickel Tetracarbonyl) 13463-39-3 150
Nitric Acid (94.5% by weight or greater) 7697-37-2 500
Nitric Oxide 10102-43-9 250
Nitroaniline (para Nitroaniline 100-01-6 5000
Nitromethane 75-52-5 2500
Nitrogen Dioxide 10102-44-0 250
Nitrogen Oxides (NO; NO2; N204; N203) 10102-44-0 250
Nitrogen Tetroxide (also called Nitrogen Peroxide) 10544-72-6 250
Nitrogen Trifluoride 7783-54-2 5000
Nitrogen Trioxide 10544-73-7 250
Oleum (65% to 80% by weight; also called Fuming Sulfuric Acid) 8014-95-7 1,000
Osmium Tetroxide 20816-12-0 100
Oxygen Difluoride (Fluorine Monoxide) 7783-41-7 100
Ozone 10028-15-6 100
Pentaborane 19624-22-7 100
Peracetic Acid (concentration >60% Acetic Acid; also called Peroxyacetic Acid) 79-21-0 1000
Perchloric Acid (concentration >60% by weight) 7601-90-3 5000
Perchloromethyl Mercaptan 594-42-3 150
Perchloryl Fluoride 7616-94-6 5000
Peroxyacetic Acid (concentration >60% Acetic Acid; also called Peracetic Acid) 79-21-0 1000
Phosgene (also called Carbonyl Chloride) 75-44-5 100
Phosphine (Hydrogen Phosphide) 7803-51-2 100
Phosphorus Oxychloride (also called Phosphoryl Chloride) 10025-87-3 1000
Phosphorus Trichloride 7719-12-2 1000
Phosphoryl Chloride (also called Phosphorus Oxychloride) 10025-87-3 1000
Propargyl Bromide 106-96-7 100
Propyl Nitrate 627-3-4 2500
Sarin 107-44-8 100
Selenium Hexafluoride 7783-79-1 1000
Stibine (Antimony Hydride) 7803-52-3 500
Sulfur Dioxide (liquid) 7446-09-5 1000
Sulfur Pentafluoride 5714-22-7 250
Sulfur Tetrafluoride 7783-60-0 250
Sulfur Trioxide (also called Sulfuric Anhydride) 7446-11-9 1000
Sulfuric Anhydride (also called Sulfur Trioxide) 7446-11-9 1000
Tellurium Hexafluoride 7783-80-4 250
Tetrafluoroethylene 116-14-3 5000
Tetrafluorohydrazine 10036-47-2 5000
Tetramethyl Lead 75-74-1 1000
Thionyl Chloride 7719-09-7 250
Trichloro (chloromethyl) Silane 1558-25-4 100
Trichloro (dichlorophenyl) Silane 27137-85-5 2500
Trichlorosilane 10025-78-2 5000
Trifluorochloroethylene 79-38-9 10000
Trimethyoxysilane 2487-90-3 1500

*Chemical Abstract Service Number.

**Threshold Quantity in Pounds (Amount necessary to be covered by this standard).

[57 FR 7847, Mar. 4, 1992; 76 FR 80738, Dec. 27, 2011; 84 FR 15102- 15104, April 15, 2019]