Highly hazardous chemical

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A highly hazardous 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 75-07-0 2500
Acrolein 107-02-8 150
Acryloyl chloride 814-68-6 250
Allyl chloride 107-05-1 1000
Allylamine 107-11-9 1000
Alkylaluminum 5000
Ammonia, anhydrous 7664-41-7 10000
Ammonia solutions (greater than 44% ammonia by weight) 7664-41-7 15000
Ammonium perchlorate 7790-98-9 7500
Ammonium permanganate 7787-36-2 7500
Arsine 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
tert-Butyl hydroperoxide 75-91-2 5000
tert-Butyl perbenzoate 614-45-9 7500
Carbonyl fluoride 353-50-4 2500
Cellulose nitrate (concentration greater than 12.6% nitrogen) 9004-70-0 2500
Chlorine 7782-50-5 1500
Chlorine dioxide 10049-04-4 1000
Chlorine pentafluoride 13637-63-3 1000
Chlorine trifluoride 7790-91-2 1000
Chlorodiethylaluminum 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 greater than 70%) 110-22-5 5000
Diazomethane 334-88-3 500
Dibenzoyl peroxide 94-36-0 7500
Diborane 19287-45-7 100
tert-Dibutyl peroxide 110-05-4 5000
Dichloroacetylene 7572-29-4 250
Dichlorosilane 4109-96-0 2500
Diethylzinc 557-20-0 10000
Diisopropyl peroxydicarbonate 105-64-6 7500
Dilauroyl peroxide 105-74-8 7500
Dimethyldichlorosilane 75-78-5 1000
1,1-Dimethylhydrazine 57-14-7 1000
Dimethylamine, anhydrous 124-40-3 2500
2,4-Dinitroaniline 97-02-9 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 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 carbonyl 13463-39-3 150
Nitric acid (94.5% by weight or greater) 7697-37-2 500
Nitric oxide 10102-43-9 250
para-Nitroaniline 100-01-6 5000
Nitromethane 75-52-5 2500
Nitrogen dioxide 10102-44-0 250
Nitrogen oxides (NO; NO2; N2O4; N2O3) 10102-44-0 250
Nitrogen tetroxide 10544-72-6 250
Nitrogen trifluoride 7783-54-2 5000
Nitrogen trioxide 10544-73-7 250
Oleum (65% to 80% by weight) 8014-95-7 1000
Osmium tetroxide 20816-12-0 100
Oxygen difluoride 7783-41-7 100
Ozone 10028-15-6 100
Pentaborane 19624-22-7 100
Peracetic acid (concentration greater than 60%) 79-21-0 1000
Perchloric acid (concentration greater than 60% by weight) 7601-90-3 5000
Perchloromethyl mercaptan 594-42-3 150
Perchloryl fluoride 7616-94-6 5000
Phosgene 75-44-5 100
Phosphine 7803-51-2 100
Phosphorus oxychloride 10025-87-3 1000
Phosphorus trichloride 7719-12-2 1000
Phosphoryl chloride 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 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 7446-11-9 1000
Sulfuric anhydride 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

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