Highly hazardous chemical

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A highly hazardous chemical, also called a harsh chemical, is a substance classified by the American Occupational Safety and Health Administration as material that is both toxic and reactive and whose potential for human injury is high if released. Highly hazardous chemicals may cause cancer, birth defects, induce genetic damage, cause miscarriage, injury and death from relatively small exposures.

Highly hazardous chemicals include:

Chemical CAS number Threshold quantity (lbs)
Acetaldehyde 75-07-02500
Acrolein 107-02-8150
Acryloyl chloride 814-68-6250
Allyl chloride 107-05-11000
Allylamine 107-11-91000
Alkylaluminum Varies5000
Ammonia, anhydrous7664-41-710000
Ammonia solutions (greater than 44% ammonia by weight)7664-41-715000
Ammonium perchlorate 7790-98-97500
Ammonium permanganate 7787-36-27500
Arsine 7784-42-1100
Bis(chloromethyl) ether 542-88-1100
Boron trichloride 10294-34-52500
Boron trifluoride 7637-07-2250
Bromine 7726-95-61500
Bromine chloride 13863-41-71500
Bromine pentafluoride 7789-30-22500
Bromine trifluoride 7787-71-515000
3-Bromopropyne 106-96-7100
tert-Butyl hydroperoxide 75-91-25000
tert-Butyl perbenzoate 614-45-97500
Carbonyl chloride 75-44-5100
Carbonyl fluoride 353-50-42500
Cellulose nitrate (concentration greater than 12.6% nitrogen)9004-70-02500
Chlorine 7782-50-51500
Chlorine dioxide 10049-04-41000
Chlorine pentafluoride 13637-63-31000
Chlorine trifluoride 7790-91-21000
Chlorodiethylaluminum 96-10-65000
1-Chloro-2,4-dinitrobenzene 97-00-75000
Chloromethyl methyl ether 107-30-2500
Chloropicrin 76-06-2500
Chloropicrin and methyl bromide mixtureNone1500
Chloropicrin and methyl chloride mixtureNone1500
Cumene hydroperoxide 80-15-95000
Cyanogen 460-19-52500
Cyanogen chloride 506-77-4500
Cyanuric fluoride 675-14-9100
Diacetyl peroxide (concentration greater than 70%)110-22-55000
Diazomethane 334-88-3500
Dibenzoyl peroxide 94-36-07500
Diborane 19287-45-7100
tert-Dibutyl peroxide 110-05-45000
Dichloroacetylene 7572-29-4250
Dichlorosilane 4109-96-02500
Diethylzinc 557-20-010000
Disopropyl peroxydicarbonate 105-64-67500
Dilauroyl peroxide 105-74-87500
Dimethyldichlorosilane 75-78-51000
1,1-Dimethylhydrazine 57-14-71000
Dimethylamine, anhydrous124-40-32500
2,4-Dinitroaniline 97-02-95000
Ethyl nitrite 109-95-55000
Ethylamine 75-04-77500
Ethylene fluorohydrin 371-62-0100
Ethylene Oxide 75-21-85000
Ethyleneimine 151-56-41000
Fluorine 7782-41-41000
Formaldehyde (formalin)50-00-01000
Furan 110-00-9500
Hexafluoroacetone 684-16-25000
Hydrochloric acid, anhydrous7647-01-05000
Hydrofluoric acid, anhydrous7664-39-31000
Hydrogen bromide 10035-10-65000
Hydrogen chloride 7647-01-05000
Hydrogen cyanide, anhydrous74-90-81000
Hydrogen fluoride 7664-39-31000
Hydrogen peroxide (52% by weight or greater)7722-84-17500
Hydrogen selenide 7783-07-5150
Hydrogen sulfide 7783-06-41500
Hydroxylamine 7803-49-82500
Iron pentacarbonyl 13463-40-6250
Isopropylamine 75-31-05000
Ketene 463-51-4100
Methacrylaldehyde 78-85-31000
Methacryloyl chloride 920-46-7150
Methacryloyloxyethyl isocyanate 30674-80-7100
Methyl acrylonitrile 126-98-7250
Methylamine, anhydrous74-89-51000
Methyl bromide 74-83-92500
Methyl chloride 74-87-315000
Methyl chloroformate 79-22-1500
Methyl ethyl ketone peroxide 1338-23-45000
Methyl fluoroacetate 453-18-9100
Methyl fluorosulfate 421-20-5100
Methyl hydrazine 60-34-4100
Methyl iodide 74-88-47500
Methyl isocyanate 624-83-9250
Methyl mercaptan 74-93-15000
Methyl vinyl ketone 79-84-4100
Methyltrichlorosilane 75-79-6500
Nickel carbonyl 13463-39-3150
Nitric acid (94.5% by weight or greater)7697-37-2500
Nitric oxide 10102-43-9250
para-Nitroaniline 100-01-65000
Nitromethane 75-52-52500
Nitrogen dioxide 10102-44-0250
Nitrogen oxides (NO; NO2; N2O4; N2O3)10102-44-0250
Nitrogen tetroxide 10544-72-6250
Nitrogen trifluoride 7783-54-25000
Nitrogen trioxide 10544-73-7250
Oleum (65% to 80% by weight)8014-95-71000
Osmium tetroxide 20816-12-0100
Oxygen difluoride 7783-41-7100
Ozone 10028-15-6100
Pentaborane 19624-22-7100
Peracetic acid (concentration greater than 60%)79-21-01000
Perchloric acid (concentration greater than 60% by weight)7601-90-35000
Perchloromethyl mercaptan 594-42-3150
Perchloryl fluoride 7616-94-65000
Phosgene 75-44-5100
Phosphine 7803-51-2100
Phosphorus oxychloride 10025-87-31000
Phosphorus trichloride 7719-12-21000
Phosphoryl chloride 10025-87-31000
Propargyl bromide 106-96-7100
Propyl nitrate 627-3-42500
Sarin 107-44-8100
Selenium hexafluoride 7783-79-11000
Stibine 7803-52-3500
Sulfur dioxide (liquid)7446-09-51000
Sulfur pentafluoride 5714-22-7250
Sulfur tetrafluoride 7783-60-0250
Sulfur trioxide 7446-11-91000
Sulfuric anhydride 7446-11-91000
Tellurium hexafluoride 7783-80-4250
Tetrafluoroethylene 116-14-35000
Tetrafluorohydrazine 10036-47-25000
Tetramethyl lead 75-74-11000
Thionyl chloride 7719-09-7250
Trichloro(chloromethyl)silane 1558-25-4100
Trichloro(dichlorophenyl)silane 27137-85-52500
Trichlorosilane 10025-78-25000
Trifluorochloroethylene 79-38-910000
Trimethoxysilane 2487-90-31500

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