{"data":{"id":"us/40-cfr-68.130","jurisdiction":"us","citation":"40 CFR 68.130","heading":"List of substances.","body":"(a) Regulated toxic and flammable substances under section 112(r) of the Clean Air Act are the substances listed in Tables 1, 2, 3, and 4. Threshold quantities for listed toxic and flammable substances are specified in the tables.\n(b) The basis for placing toxic and flammable substances on the list of regulated substances are explained in the notes to the list.\nTable 1 to § 68.130—List of Regulated Toxic Substances and Threshold Quantities for Accidental Release Prevention\n[Alphabetical Order—77 Substances]\nChemical name CAS No. Threshold quantity (lbs) Basis for listing\nAcrolein [2-Propenal] 107-02-8 5,000 b\nAcrylonitrile [2-Propenenitrile] 107-13-1 20,000 b\nAcrylyl chloride [2-Propenoyl chloride] 814-68-6 5,000 b\nAllyl alcohol [2-Propen-l-ol] 107-18-6 15,000 b\nAllylamine [2-Propen-l-amine] 107-11-9 10,000 b\nAmmonia (anhydrous) 7664-41-7 10,000 a, b\nAmmonia (conc 20% or greater) 7664-41-7 20,000 a, b\nArsenous trichloride 7784-34-1 15,000 b\nArsine 7784-42-1 1,000 b\nBoron trichloride [Borane, trichloro-] 10294-34-5 5,000 b\nBoron trifluoride [Borane, trifluoro-] 7637-07-2 5,000 b\nBoron trifluoride compound with methyl ether (1:1) [Boron, trifluoro [oxybis [metane]]-, T-4- 353-42-4 15,000 b\nBromine 7726-95-6 10,000 a, b\nCarbon disulfide 75-15-0 20,000 b\nChlorine 7782-50-5 2,500 a, b\nChlorine dioxide [Chlorine oxide (ClO2)] 10049-04-4 1,000 c\nChloroform [Methane, trichloro-] 67-66-3 20,000 b\nChloromethyl ether [Methane, oxybis[chloro-] 542-88-1 1,000 b\nChloromethyl methyl ether [Methane, chloromethoxy-] 107-30-2 5,000 b\nCrotonaldehyde [2-Butenal] 4170-30-3 20,000 b\nCrotonaldehyde, (E)- [2-Butenal, (E)-] 123-73-9 20,000 b\nCyanogen chloride 506-77-4 10,000 c\nCyclohexylamine [Cyclohexanamine] 108-91-8 15,000 b\nDiborane 19287-45-7 2,500 b\nDimethyldichlorosilane [Silane, dichlorodimethyl-] 75-78-5 5,000 b\n1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] 57-14-7 15,000 b\nEpichlorohydrin [Oxirane, (chloromethyl)-] 106-89-8 20,000 b\nEthylenediamine [1,2-Ethanediamine] 107-15-3 20,000 b\nEthyleneimine [Aziridine] 151-56-4 10,000 b\nEthylene oxide [Oxirane] 75-21-8 10,000 a, b\nFluorine 7782-41-4 1,000 b\nFormaldehyde (solution) 50-00-0 15,000 b\nFuran 110-00-9 5,000 b\nHydrazine 302-01-2 15,000 b\nHydrochloric acid (conc 37% or greater) 7647-01-0 15,000 d\nHydrocyanic acid 74-90-8 2,500 a, b\nHydrogen chloride (anhydrous) [Hydrochloric acid] 7647-01-0 5,000 a\nHydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] 7664-39-3 1,000 a, b\nHydrogen selenide 7783-07-5 500 b\nHydrogen sulfide 7783-06-4 10,000 a, b\nIron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] 13463-40-6 2,500 b\nIsobutyronitrile [Propanenitrile, 2-methyl-] 78-82-0 20,000 b\nIsopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester] 108-23-6 15,000 b\nMethacrylonitrile [2-Propenenitrile, 2-methyl-] 126-98-7 10,000 b\nMethyl chloride [Methane, chloro-] 74-87-3 10,000 a\nMethyl chloroformate [Carbonochloridic acid, methylester] 79-22-1 5,000 b\nMethyl hydrazine [Hydrazine, methyl-] 60-34-4 15,000 b\nMethyl isocyanate [Methane, isocyanato-] 624-83-9 10,000 a, b\nMethyl mercaptan [Methanethiol] 74-93-1 10,000 b\nMethyl thiocyanate [Thiocyanic acid, methyl ester] 556-64-9 20,000 b\nMethyltrichlorosilane [Silane, trichloromethyl-] 75-79-6 5,000 b\nNickel carbonyl 13463-39-3 1,000 b\nNitric acid (conc 80% or greater) 7697-37-2 15,000 b\nNitric oxide [Nitrogen oxide (NO)] 10102-43-9 10,000 b\nOleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide] 1 8014-95-7 10,000 e\nPeracetic acid [Ethaneperoxoic acid] 79-21-0 10,000 b\nPerchloromethylmercaptan [Methanesulfenyl chloride, trichloro-] 594-42-3 10,000 b\nPhosgene [Carbonic dichloride] 75-44-5 500 a, b\nPhosphine 7803-51-2 5,000 b\nPhosphorus oxychloride [Phosphoryl chloride] 10025-87-3 5,000 b\nPhosphorus trichloride [Phosphorous trichloride] 7719-12-2 15,000 b\nPiperidine 110-89-4 15,000 b\nPropionitrile [Propanenitrile] 107-12-0 10,000 b\nPropyl chloroformate [Carbonochloridic acid, propylester] 109-61-5 15,000 b\nPropyleneimine [Aziridine, 2-methyl-] 75-55-8 10,000 b\nPropylene oxide [Oxirane, methyl-] 75-56-9 10,000 b\nSulfur dioxide (anhydrous) 7446-09-5 5,000 a, b\nSulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] 7783-60-0 2,500 b\nSulfur trioxide 7446-11-9 10,000 a, b\nTetramethyllead [Plumbane, tetramethyl-] 75-74-1 10,000 b\nTetranitromethane [Methane, tetranitro-] 509-14-8 10,000 b\nTitanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] 7550-45-0 2,500 b\nToluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-] 1 584-84-9 10,000 a\nToluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-] 1 91-08-7 10,000 a\nToluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl-] 1 26471-62-5 10,000 a\nTrimethylchlorosilane [Silane, chlorotrimethyl-] 75-77-4 10,000 b\nVinyl acetate monomer [Acetic acid ethenyl ester] 108-05-4 15,000 b\n1 The mixture exemption in § 68.115(b)(1) does not apply to the substance.\nNote: Basis for Listing:\na Mandated for listing by Congress.\nb On EHS list, vapor pressure 10 mmHg or greater.\nc Toxic gas.\nd Toxicity of hydrogen chloride, potential to release hydrogen chloride, and history of accidents.\ne Toxicity of sulfur trioxide and sulfuric acid, potential to release sulfur trioxide, and history of accidents.\nTable 2 to § 68.130—List of Regulated Toxic Substances and Threshold Quantities for Accidental Release Prevention\n[CAS Number Order—77 Substances]\nCAS No. Chemical name Threshold quantity (lbs) Basis for listing\n50-00-0 Formaldehyde (solution) 15,000 b\n57-14-7 1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] 15,000 b\n60-34-4 Methyl hydrazine [Hydrazine, methyl-] 15,000 b\n67-66-3 Chloroform [Methane, trichloro-] 20,000 b\n74-87-3 Methyl chloride [Methane, chloro-] 10,000 a\n74-90-8 Hydrocyanic acid 2,500 a, b\n74-93-1 Methyl mercaptan [Methanethiol] 10,000 b\n75-15-0 Carbon disulfide 20,000 b\n75-21-8 Ethylene oxide [Oxirane] 10,000 a, b\n75-44-5 Phosgene [Carbonic dichloride] 500 a, b\n75-55-8 Propyleneimine [Aziridine, 2-methyl-] 10,000 b\n75-56-9 Propylene oxide [Oxirane, methyl-] 10,000 b\n75-74-1 Tetramethyllead [Plumbane, tetramethyl-] 10,000 b\n75-77-4 Trimethylchlorosilane [Silane, chlorotrimethyl-] 10,000 b\n75-78-5 Dimethyldichlorosilane [Silane, dichlorodimethyl-] 5,000 b\n75-79-6 Methyltrichlorosilane [Silane, trichloromethyl-] 5,000 b\n78-82-0 Isobutyronitrile [Propanenitrile, 2-methyl-] 20,000 b\n79-21-0 Peracetic acid [Ethaneperoxoic acid] 10,000 b\n79-22-1 Methyl chloroformate [Carbonochloridic acid, methylester] 5,000 b\n91-08-7 Toluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-]1 10,000 a\n106-89-8 Epichlorohydrin [Oxirane, (chloromethyl)-] 20,000 b\n107-02-8 Acrolein [2-Propenal] 5,000 b\n107-11-9 Allylamine [2-Propen-1-amine] 10,000 b\n107-12-0 Propionitrile [Propanenitrile] 10,000 b\n107-13-1 Acrylonitrile [2-Propenenitrile] 20,000 b\n107-15-3 Ethylenediamine [1,2-Ethanediamine] 20,000 b\n107-18-6 Allyl alcohol [2-Propen-1-ol] 15,000 b\n107-30-2 Chloromethyl methyl ether [Methane, chloromethoxy-] 5,000 b\n108-05-4 Vinyl acetate monomer [Acetic acid ethenyl ester] 15,000 b\n108-23-6 Isopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester] 15,000 b\n108-91-8 Cyclohexylamine [Cyclohexanamine] 15,000 b\n109-61-5 Propyl chloroformate [Carbonochloridic acid, propylester] 15,000 b\n110-00-9 Furan 5,000 b\n110-89-4 Piperidine 15,000 b\n123-73-9 Crotonaldehyde, (E)- [2-Butenal, (E)-] 20,000 b\n126-98-7 Methacrylonitrile [2-Propenenitrile, 2-methyl-] 10,000 b\n151-56-4 Ethyleneimine [Aziridine] 10,000 b\n302-01-2 Hydrazine 15,000 b\n353-42-4 Boron trifluoride compound with methyl ether (1:1) [Boron, trifluoro[oxybis[methane]]-, T-4- 15,000 b\n506-77-4 Cyanogen chloride 10,000 c\n509-14-8 Tetranitromethane [Methane, tetranitro-] 10,000 b\n542-88-1 Chloromethyl ether [Methane, oxybis[chloro-] 1,000 b\n556-64-9 Methyl thiocyanate [Thiocyanic acid, methyl ester] 20,000 b\n584-84-9 Toluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-]1 10,000 a\n594-42-3 Perchloromethylmercaptan [Methanesulfenyl chloride, trichloro-] 10,000 b\n624-83-9 Methyl isocyanate [Methane, isocyanato-] 10,000 a, b\n814-68-6 Acrylyl chloride [2-Propenoyl chloride] 5,000 b\n4170-30-3 Crotonaldehyde [2-Butenal] 20,000 b\n7446-09-5 Sulfur dioxide (anhydrous) 5,000 a, b\n7446-11-9 Sulfur trioxide 10,000 a, b\n7550-45-0 Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] 2,500 b\n7637-07-2 Boron trifluoride [Borane, trifluoro-] 5,000 b\n7647-01-0 Hydrochloric acid (conc 37% or greater) 15,000 d\n7647-01-0 Hydrogen chloride (anhydrous) [Hydrochloric acid] 5,000 a\n7664-39-3 Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] 1,000 a, b\n7664-41-7 Ammonia (anhydrous) 10,000 a, b\n7664-41-7 Ammonia (conc 20% or greater) 20,000 a, b\n7697-37-2 Nitric acid (conc 80% or greater) 15,000 b\n7719-12-2 Phosphorus trichloride [Phosphorous trichloride] 15,000 b\n7726-95-6 Bromine 10,000 a, b\n7782-41-4 Fluorine 1,000 b\n7782-50-5 Chlorine 2,500 a, b\n7783-06-4 Hydrogen sulfide 10,000 a, b\n7783-07-5 Hydrogen selenide 500 b\n7783-60-0 Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] 2,500 b\n7784-34-1 Arsenous trichloride 15,000 b\n7784-42-1 Arsine 1,000 b\n7803-51-2 Phosphine 5,000 b\n8014-95-7 Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide]1 10,000 e\n10025-87-3 Phosphorus oxychloride [Phosphoryl chloride] 5,000 b\n10049-04-4 Chlorine dioxide [Chlorine oxide (ClO2)] 1,000 c\n10102-43-9 Nitric oxide [Nitrogen oxide (NO)] 10,000 b\n10294-34-5 Boron trichloride [Borane, trichloro-] 5,000 b\n13463-39-3 Nickel carbonyl 1,000 b\n13463-40-6 Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] 2,500 b\n19287-45-7 Diborane 2,500 b\n26471-62-5 Toluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl-1]1 10,000 a\n1 The mixture exemption in § 68.115(b)(1) does not apply to the substance.\nNote: Basis for Listing:\na Mandated for listing by Congress.\nb On EHS list, vapor pressure 10 mmHg or greater.\nc Toxic gas.\nd Toxicity of hydrogen chloride, potential to release hydrogen chloride, and history of accidents.\ne Toxicity of sulfur trioxide and sulfuric acid, potential to release sulfur trioxide, and history of accidents.\nTable 3 to § 68.130—List of Regulated Flammable Substances 1 and Threshold Quantities for Accidental Release Prevention\n[Alphabetical Order—63 Substances]\nChemical name CAS No. Threshold quantity (lbs) Basis for listing\nAcetaldehyde 75-07-0 10,000 g\nAcetylene [Ethyne] 74-86-2 10,000 f\nBromotrifluorethylene [Ethene, bromotrifluoro-] 598-73-2 10,000 f\n1,3-Butadiene 106-99-0 10,000 f\nButane 106-97-8 10,000 f\n1-Butene 106-98-9 10,000 f\n2-Butene 107-01-7 10,000 f\nButene 25167-67-3 10,000 f\n2-Butene-cis 590-18-1 10,000 f\n2-Butene-trans [2-Butene, (E)] 624-64-6 10,000 f\nCarbon oxysulfide [Carbon oxide sulfide (COS)] 463-58-1 10,000 f\nChlorine monoxide [Chlorine oxide] 7791-21-1 10,000 f\n2-Chloropropylene [1-Propene, 2-chloro-] 557-98-2 10,000 g\n1-Chloropropylene [1-Propene, 1-chloro-] 590-21-6 10,000 g\nCyanogen [Ethanedinitrile] 460-19-5 10,000 f\nCyclopropane 75-19-4 10,000 f\nDichlorosilane [Silane, dichloro-] 4109-96-0 10,000 f\nDifluoroethane [Ethane, 1,1-difluoro-] 75-37-6 10,000 f\nDimethylamine [Methanamine, N-methyl-] 124-40-3 10,000 f\n2,2-Dimethylpropane [Propane, 2,2-dimethyl-] 463-82-1 10,000 f\nEthane 74-84-0 10,000 f\nEthyl acetylene [1-Butyne] 107-00-6 10,000 f\nEthylamine [Ethanamine] 75-04-7 10,000 f\nEthyl chloride [Ethane, chloro-] 75-00-3 10,000 f\nEthylene [Ethene] 74-85-1 10,000 f\nEthyl ether [Ethane, 1,1′-oxybis-] 60-29-7 10,000 g\nEthyl mercaptan [Ethanethiol] 75-08-1 10,000 g\nEthyl nitrite [Nitrous acid, ethyl ester] 109-95-5 10,000 f\nHydrogen 1333-74-0 10,000 f\nIsobutane [Propane, 2-methyl] 75-28-5 10,000 f\nIsopentane [Butane, 2-methyl-] 78-78-4 10,000 g\nIsoprene [1,3-Butadinene, 2-methyl-] 78-79-5 10,000 g\nIsopropylamine [2-Propanamine] 75-31-0 10,000 g\nIsopropyl chloride [Propane, 2-chloro-] 75-29-6 10,000 g\nMethane 74-82-8 10,000 f\nMethylamine [Methanamine] 74-89-5 10,000 f\n3-Methyl-1-butene 563-45-1 10,000 f\n2-Methyl-1-butene 563-46-2 10,000 g\nMethyl ether [Methane, oxybis-] 115-10-6 10,000 f\nMethyl formate [Formic acid, methyl ester] 107-31-3 10,000 g\n2-Methylpropene [1-Propene, 2-methyl-] 115-11-7 10,000 f\n1,3-Pentadinene 504-60-9 10,000 f\nPentane 109-66-0 10,000 g\n1-Pentene 109-67-1 10,000 g\n2-Pentene, (E)- 646-04-8 10,000 g\n2-Pentene, (Z)- 627-20-3 10,000 g\nPropadiene [1,2-Propadiene] 463-49-0 10,000 f\nPropane 74-98-6 10,000 f\nPropylene [1-Propene] 115-07-1 10,000 f\nPropyne [1-Propyne] 74-99-7 10,000 f\nSilane 7803-62-5 10,000 f\nTetrafluoroethylene [Ethene, tetrafluoro-] 116-14-3 10,000 f\nTetramethylsilane [Silane, tetramethyl-] 75-76-3 10,000 g\nTrichlorosilane [Silane, trichloro-] 10025-78-2 10,000 g\nTrifluorochloroethylene [Ethene, chlorotrifluoro-] 79-38-9 10,000 f\nTrimethylamine [Methanamine, N,N-dimethyl-] 75-50-3 10,000 f\nVinyl acetylene [1-Buten-3-yne] 689-97-4 10,000 f\nVinyl chloride [Ethene, chloro-] 75-01-4 10,000 a, f\nVinyl ethyl ether [Ethene, ethoxy-] 109-92-2 10,000 g\nVinyl fluoride [Ethene, fluoro-] 75-02-5 10,000 f\nVinylidene chloride [Ethene, 1,1-dichloro-] 75-35-4 10,000 g\nVinylidene fluoride [Ethene, 1,1-difluoro-] 75-38-7 10,000 f\nVinyl methyl ether [Ethene, methoxy-] 107-25-5 10,000 f\n1 A flammable substance when used as a fuel or held for sale as a fuel at a retail facility is excluded from all provisions of this part (see § 68.126).\nNote: Basis for Listing:\na Mandated for listing by Congress.\nf Flammable gas.\ng Volatile flammable liquid.\nTable 4 to § 68.130—List of Regulated Flammable Substances 1 and Threshold Quantities for Accidental Release Prevention\n[CAS Number Order—63 Substances]\nCAS No. Chemical name Threshold quantity (lbs) Basis for listing\n60-29-7 Ethyl ether [Ethane, 1,1′-oxybis-] 10,000 g\n74-82-8 Methane 10,000 f\n74-84-0 Ethane 10,000 f\n74-85-1 Ethylene [Ethene] 10,000 f\n74-86-2 Acetylene [Ethyne] 10,000 f\n74-89-5 Methylamine [Methanamine] 10,000 f\n74-98-6 Propane 10,000 f\n74-99-7 Propyne [1-Propyne] 10,000 f\n75-00-3 Ethyl chloride [Ethane, chloro-] 10,000 f\n75-01-4 Vinyl chloride [Ethene, chloro-] 10,000 a, f\n75-02-5 Vinyl fluoride [Ethene, fluoro-] 10,000 f\n75-04-7 Ethylamine [Ethanamine] 10,000 f\n75-07-0 Acetaldehyde 10,000 g\n75-08-1 Ethyl mercaptan [Ethanethiol] 10,000 g\n75-19-4 Cyclopropane 10,000 f\n75-28-5 Isobutane [Propane, 2-methyl] 10,000 f\n75-29-6 Isopropyl chloride [Propane, 2-chloro-] 10,000 g\n75-31-0 Isopropylamine [2-Propanamine] 10,000 g\n75-35-4 Vinylidene chloride [Ethene, 1,1-dichloro-] 10,000 g\n75-37-6 Difluoroethane [Ethane, 1,1-difluoro-] 10,000 f\n75-38-7 Vinylidene fluoride [Ethene, 1,1-difluoro-] 10,000 f\n75-50-3 Trimethylamine [Methanamine, N, N-dimethyl-] 10,000 f\n75-76-3 Tetramethylsilane [Silane, tetramethyl-] 10,000 g\n78-78-4 Isopentane [Butane, 2-methyl-] 10,000 g\n78-79-5 Isoprene [1,3,-Butadiene, 2-methyl-] 10,000 g\n79-38-9 Trifluorochloroethylene [Ethene, chlorotrifluoro-] 10,000 f\n106-97-8 Butane 10,000 f\n106-98-9 1-Butene 10,000 f\n106-99-0 1,3-Butadiene 10,000 f\n107-00-6 Ethyl acetylene [1-Butyne] 10,000 f\n107-01-7 2-Butene 10,000 f\n107-25-5 Vinyl methyl ether [Ethene, methoxy-] 10,000 f\n107-31-3 Methyl formate [Formic acid, methyl ester] 10,000 g\n109-66-0 Pentane 10,000 g\n109-67-1 1-Pentene 10,000 g\n109-92-2 Vinyl ethyl ether [Ethene, ethoxy-] 10,000 g\n109-95-5 Ethyl nitrite [Nitrous acid, ethyl ester] 10,000 f\n115-07-1 Propylene [1-Propene] 10,000 f\n115-10-6 Methyl ether [Methane, oxybis-] 10,000 f\n115-11-7 2-Methylpropene [1-Propene, 2-methyl-] 10,000 f\n116-14-3 Tetrafluoroethylene [Ethene, tetrafluoro-] 10,000 f\n124-40-3 Dimethylamine [Methanamine, N-methyl-] 10,000 f\n460-19-5 Cyanogen [Ethanedinitrile] 10,000 f\n463-49-0 Propadiene [1,2-Propadiene] 10,000 f\n463-58-1 Carbon oxysulfide [Carbon oxide sulfide (COS)] 10,000 f\n463-82-1 2,2-Dimethylpropane [Propane, 2,2-dimethyl-] 10,000 f\n504-60-9 1,3-Pentadiene 10,000 f\n557-98-2 2-Chloropropylene [1-Propene, 2-chloro-] 10,000 g\n563-45-1 3-Methyl-1-butene 10,000 f\n563-46-2 2-Methyl-1-butene 10,000 g\n590-18-1 2-Butene-cis 10,000 f\n590-21-6 1-Chloropropylene [1-Propene, 1-chloro-] 10,000 g\n598-73-2 Bromotrifluorethylene [Ethene, bromotrifluoro-] 10,000 f\n624-64-6 2-Butene-trans [2-Butene, (E)] 10,000 f\n627-20-3 2-Pentene, (Z)- 10,000 g\n646-04-8 2-Pentene, (E)- 10,000 g\n689-97-4 Vinyl acetylene [1-Buten-3-yne] 10,000 f\n1333-74-0 Hydrogen 10,000 f\n4109-96-0 Dichlorosilane [Silane, dichloro-] 10,000 f\n7791-21-1 Chlorine monoxide [Chlorine oxide] 10,000 f\n7803-62-5 Silane 10,000 f\n10025-78-2 Trichlorosilane [Silane, trichloro-] 10,000 g\n25167-67-3 Butene 10,000 f\n1 A flammable substance when used as a fuel or held for sale as a fuel at a retail facility is excluded from all provisions of this part (see § 68.126).\nNote: Basis for Listing:\na Mandated for listing by Congress.\nf Flammable gas.\ng Volatile flammable liquid.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 68—CHEMICAL ACCIDENT PREVENTION PROVISIONS","Subpart F—Regulated Substances for Accidental Release Prevention"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"32cb7ddc23b1bbabd6ae5fe374e799a44be12d219fb5f2ec48ac23591a09595e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-68.126","next":"us/40-cfr-68.150"},"notice":"GroundRules: Original legal text. Not legal advice."}