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List of Regulated Substances and Thresholds for Accidental Release Prevention

40 CFR Part 68
(in alphabetical order)

 
Chemical Name CAS No. Threshold Quantity (lbs.)
1,1-Dichloroethylene 75-35-4 10,000
1,1-Dimethyl hydrazine 57-14-7 15,000
1,2-Ethanediamine 107-15-3 20,000
1,2-Propadiene 463-49-0 10,000
1,3-Butadiene 106-99-0 10,000
1,3-Butadiene, 2-methyl- 78-79-5 10,000
1,3-Pentadiene 504-60-9 10,000
1-Buten-3-yne 689-97-4 10,000
1-Butene 106-98-9 10,000
1-Butyne 107-00-6 10,000
1-Chloropropylene 590-21-6 10,000
1-Pentene 109-67-1 10,000
1-Propene 115-07-1 10,000
1-Propene, 1-chloro- 590-21-6 10,000
1-Propene, 2-chloro- 557-98-2 10,000
1-Propene, 2-methyl- 115-11-7 10,000
1-Propyne 74-99-7 10,000
2,2-Dimethylpropane 463-82-1 10,000
2-Butenal 4170-30-3 20,000
2-Butenal, (e)- 123-73-9 20,000
2-Butene 107-01-7 10,000
2-Butene, (E) 624-64-6 10,000
2-Butene-cis 590-18-1 10,000
2-Butene-trans 624-64-6 10,000
2-Chloropropylene 557-98-2 10,000
2-Methyl-1-butene 563-46-2 10,000
2-Methylpropene 115-11-7 10,000
2-Pentene, (E)- 646-04-8 10,000
2-Pentene, (Z)- 627-20-3 10,000
2-Propanamine 75-31-0 10,000
2-Propen-1-amine 107-11-9 10,000
2-Propen-1-ol 107-18-6 15,000
2-Propenal 107-02-8 5,000
2-Propenenitrile 107-13-1 20,000
2-Propenenitrile, 2-methyl- 126-98-7 10,000
2-Propenoyl chloride 814-68-6 5,000
3-Methyl-1-butene 563-45-1 10,000
Acetaldehyde 75-07-0 10,000
Acetic acid ethenyl ester 108-05-4 15,000
Acetylene 74-86-2 10,000
Acrolein 107-02-8 5,000
Acrylonitrile 107-13-1 20,000
Acrylyl chloride 814-68-6 5,000
Allyl alcohol 107-18-6 15,000
Allylamine 107-11-9 10,000
Ammonia (anhydrous) 7664-41-7 10,000
Ammonia (conc 20% or greater) 7664-41-7 20,000
Arsenous trichloride 7784-34-1 15,000
Arsine 7784-42-1 1,000
Aziridine 151-56-4 10,000
Aziridine, 2-methyl 75-55-8 10,000
Benzene,1,3-diisocyanato-2- 
methyl-
91-08-7 10,000
Benzene, 1,3- 
diisocyanatomethyl-
26471-62-5 10,000
Benzene, 2,4-diisocyanato-1- 
methyl-
584-84-9 10,000
Bis(chloromethyl) ether 542-88-1 1,000
Borane, trichloro- 10294-34-5 5,000
Borane, trifluoro- 7637-07-2 5,000
Boron trichloride 10294-34-5 5,000
Boron trifluoride 7637-07-2 5,000
Boron trifluoride compound with methyl ether (1:1) 353-42-4 15,000
Boron, trifluoro[oxybis [methane]]-, (T-4)- 353-42-4 15,000
Bromine 7726-95-6 10,000
Bromotrifluoroethylene 598-73-2 10,000
Butane 106-97-8 10,000
Butane, 2-methyl- 78-78-4 10,000
Butene 25167-67-3 10,000
Carbon disulfide 75-15-0 20,000
Carbon oxide sulfide (COS) 463-58-1 10,000
Carbonic dichloride 75-44-5 500
Carbonochloridic acid, 1-methylethyl ester 108-23-6 15,000
Carbonochloridic acid, methylester 79-22-1 5,000
Carbonochloridic acid, propylester 109-61-5 15,000
Carbonyl sulfide 463-58-1 10,000
Chlorine 7782-50-5 2,500
Chlorine dioxide 10049-04-4 1,000
Chlorine monoxide 7791-21-1 10,000
Chlorine oxide 7791-21-1 10,000
Chlorine oxide (ClO2) 10049-04-4 1,000
Chloroethane 75-00-3 10,000
Chloroform 67-66-3 20,000
Chloromethane 74-87-3 10,000
Chloromethyl ether 542-88-1 1,000
Chloromethyl methyl ether 107-30-2 5,000
Crotonaldehyde 4170-30-3 20,000
Crotonaldehyde, (E)-  123-73-9 20,000
Cyanogen  460-19-5 10,000
Cyanogen chloride 506-77-4 10,000
Cyanogen chloride ((CN)Cl) 506-77-4 10,000
Cyclohexanamine 108-91-8 15,000
Cyclohexylamine 108-91-8 15,000
Cyclopropane 75-19-4 10,000
Diborane 19287-45-7 2,500
Diborane(6) 19287-45-7 2,500
Dichloromethyl ether  542-88-1 1,000
Dichlorosilane 4109-96-0 10,000
Difluoroethane 75-37-6 10,000
Dimethylamine 124-40-3 10,000
Dimethyldichlorosilane 75-78-5 5,000
Dimethylhydrazine 57-14-7  15,000
Epichlorohydrin 106-89-8 20,000
Ethanamine 75-04-7 10,000
Ethane 74-84-0 10,000 
Ethane, 1,1'-oxybis-  60-29-7 10,000
Ethane, 1,1-difluoro- 75-37-6 10,000
Ethane, chloro- 75-00-3 10,000
Ethanedinitrile 460-19-5 10,000
Ethaneperoxoic acid  79-21-0 10,000
Ethanethiol 75-08-1 10,000
Ethene 74-85-1 10,000
Ethene, 1,1-dichloro- 75-35-4 10,000
Ethene, 1,1-difluoro-  75-38-7 10,000
Ethene, bromotrifluoro- 598-73-2 10,000
Ethene, chloro- 75-01-4 10,000
Ethene, chlorotrifluoro- 79-38-9 10,000
Ethene, ethoxy-  109-92-2  10,000 
Ethene, fluoro- 75-02-5  10,000
Ethene, methoxy-  107-25-5 10,000
Ethene, tetrafluoro- 116-14-3 10,000
Ethyl acetylene 107-00-6  10,000
Ethyl chloride 75-00-3 10,000 
Ethyl cyanide 107-12-0 10,000
Ethyl ether 60-29-7 10,000
Ethyl mercaptan 75-08-1  10,000
Ethyl nitrite 109-95-5  10,000 
Ethylene 74-85-1 10,000
Ethylene oxide 75-21-8 10,000
Ethylenediamine 107-15-3 20,000
Ethyleneimine 151-56-4 10,000
Ethyne 74-86-2 10,000 
Fluorine 7782-41-4 1,000 
Formaldehyde 50-00-0 15,000 
Formaldehyde (solution) 50-00-0 15,000
Formic acid, methyl ester 107-31-3 10,000
Furan 110-00-9 5,000
Hydrazine 302-01-2 15,000
Hydrazine, 1,1-dimethyl- 57-14-7 15,000
Hydrazine, methyl- 60-34-4 15,000
Hydrochloric acid (conc 37% or greater) 7647-01-0 15,000
Hydrocyanic acid 74-90-8 2,500
Hydrofluoric acid (conc. 50% or greater) 7664-39-3 1,000
Hydrogen  1333-74-0 10,000
Hydrogen chloride (anhydrous) 7647-01-0 5,000
Hydrogen chloride (gas only) 7647-01-0 5,000
Hydrogen cyanide 74-90-8 2,500
Hydrogen fluoride (anhydrous) 7664-39-3 1,000
Hydrogen selenide 7783-07-5 500
Hydrogen sulfide 7783-06-4 10,000
Iron carbonyl (Fe(CO)5), (TB-5-11)- 13463-40-6 2,500
Iron, pentacarbonyl-  13463-40-6 2,500
Isobutane 75-28-5 10,000
Isobutyronitrile 78-82-0 20,000
Isopentane 78-78-4 10,000
Isoprene 78-79-5 10,000
Isopropyl chloride 75-29-6 10,000
Isopropyl chloroformate 108-23-6 15,000
Isopropylamine 75-31-0 10,000
Methacrylonitrile 126-98-7 10,000
Methanamine 74-89-5 10,000
Methanamine, N,N-dimethyl- 75-50-3 10,000
Methanamine, N-methyl- 124-40-3 10,000
Methane 74-82-8 10,000
Methane, chloro- 74-87-3 10,000
Methane, chloromethoxy- 107-30-2 5,000
Methane, isocyanato- 624-83-9 10,000
Methane, oxybis- 115-10-6 10,000
Methane, oxybis[chloro- 542-88-1 1,000
Methane, tetranitro-  509-14-8 10,000
Methane, trichloro- 67-66-3 20,000
Methanesulfenyl chloride, trichloro-  594-42-3 10,000
Methanethiol 74-93-1 10,000
Methyl chloride 74-87-3 10,000
Methyl chlorocarbonate 79-22-1 5,000
Methyl chloroformate 79-22-1 5,000
Methyl ether 115-10-6 10,000
Methyl formate 107-31-3 10,000
Methyl hydrazine 60-34-4 15,000
Methyl isocyanate 624-83-9 10,000
Methyl mercaptan 74-93-1 10,000
Methyl thiocyanate 556-64-9 20,000
Methyltrichlorosilane 75-79-6 5,000
Monoethylamine 75-04-7 10,000
Monomethylamine 74-89-5 10,000
Nickel carbonyl 13463-39-3 1,000
Nitric acid (conc 80% or greater) 7697-37-2 15,000
Nitric oxide 10102-43-9 10,000
Nitrogen oxide (NO) 10102-43-9 10,000
Nitrous acid, ethyl ester 109-95-5 10,000
Oleum (fuming sulfuric acid) 8014-95-7 10,000
Oxirane 75-21-8  10,000 
Oxirane, (chloromethyl)- 106-89-8 20,000 
Oxirane, methyl- 75-56-9 10,000 
Pentane 109-66-0 10,000 
Peracetic acid 79-21-0 10,000
Perchloromethyl mercaptan  594-42-3 10,000 
Phosgene 75-44-5 500
Phosphine 7803-51-2 5,000
Phosphorous trichloride 7719-12-2 15,000
Phosphorus oxychloride 10025-87-3 5,000
Phosphorus trichloride 7719-12-2 15,000 
Phosphoryl chloride 10025-87-3 5,000
Piperidine  110-89-4 15,000
Plumbane, tetramethyl- 75-74-1 10,000
Propadiene 463-49-0 10,000
Propane 74-98-6 10,000
Propane, 2,2-dimethyl-  463-82-1 10,000
Propane, 2-chloro-  75-29-6 10,000
Propane, 2-methyl  75-28-5 10,000
Propanenitrile 107-12-0 10,000
Propanenitrile, 2-methyl- 78-82-0 20,000
Propene  115-07-1 10,000 
Propionitrile 107-12-0 10,000
Propyl chloroformate 109-61-5 15,000
Propylene 115-07-1 10,000
Propylene oxide 75-56-9 10,000
Propyleneimine 75-55-8 10,000 
Propyne 74-99-7 10,000
Silane  7803-62-5  10,000
Silane, chlorotrimethyl- 75-77-4 10,000
Silane, dichloro-  4109-96-0  10,000
Silane, dichlorodimethyl- 75-78-5 5,000 
Silane, tetramethyl- 75-76-3  10,000
Silane, trichloro- 10025-78-2 10,000
Silane, trichloromethyl- 75-79-6 5,000
Sulfur dioxide (anhydrous) 7446-09-5 5,000
Sulfur fluoride (SF4), (T-4)- 7783-60-0 2,500
Sulfur tetrafluoride 7783-60-0 2,500
Sulfur trioxide 7446-11-9 10,000
Sulfuric acid (fuming) 8014-95-7 10,000
Sulfuric acid, mixture with sulfur trioxide 8014-95-7 10,000
Tetrafluoroethylene 116-14-3 10,000
Tetramethyllead  75-74-1 10,000
Tetramethylsilane 75-76-3 10,000 
Tetranitromethane 509-14-8 10,000
Thiocyanic acid, methyl ester 556-64-9 20,000
Thiomethanol  74-93-1 10,000
Titanium chloride (TiCl4) (T-4)- 7550-45-0 2,500
Titanium tetrachloride 7550-45-0  2,500
Toluene diisocyanate (unspecified isomer) 26471-62-5 10,000
Toluene-2,4-diisocyanate  584-84-9 10,000
Toluene-2,6-diisocyanate 91-08-7 10,000
Toluenediisocyanate (mixed isomers) 26471-62-5 10,000
Trichloromethanesulfenyl chloride 594-42-3 10,000
Trichlorosilane 10025-78-2 10,000
Trifluorochloroethylene 79-38-9 10,000
Trimethylamine 75-50-3 10,000
Trimethylchlorosilane 75-77-4 10,000
Vinyl acetate 108-05-4 15,000
Vinyl acetate monomer 108-05-4 15,000
Vinyl acetylene 689-97-4 10,000
Vinyl chloride 75-01-4 10,000
Vinyl ethyl ether 109-92-2 10,000
Vinyl fluoride 75-02-5 10,000 
Vinyl methyl ether 107-25-5 10,000
Vinylidene chloride 75-35-4 10,000
Vinylidene fluoride 75-38-7 10,000

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