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§ 68.130 List of substances.
(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.
(b) The basis for placing toxic and flammable substances on the list of regulated substances are explained in the notes to the list.
Table 1 to § 68.130—List of Regulated Toxic Substances and Threshold Quantities for Accidental Release Prevention
[Alphabetical Order—77 Substances]
| Chemical name | CAS No. | Threshold quantity (lbs) | Basis for listing |
|---|---|---|---|
| Acrolein [2-Propenal] | 107–02–8 | 5,000 | b |
| Acrylonitrile [2-Propenenitrile] | 107–13–1 | 20,000 | b |
| Acrylyl chloride [2-Propenoyl chloride] | 814–68–6 | 5,000 | b |
| Allyl alcohol [2-Propen-l-ol] | 107–18–6 | 15,000 | b |
| Allylamine [2-Propen-l-amine] | 107–11–9 | 10,000 | b |
| Ammonia (anhydrous) | 7664–41–7 | 10,000 | a, b |
| Ammonia (conc 20% or greater) | 7664–41–7 | 20,000 | a, b |
| Arsenous trichloride | 7784–34–1 | 15,000 | b |
| Arsine | 7784–42–1 | 1,000 | b |
| Boron trichloride [Borane, trichloro-] | 10294–34–5 | 5,000 | b |
| Boron trifluoride [Borane, trifluoro-] | 7637–07–2 | 5,000 | b |
| Boron trifluoride compound with methyl ether (1:1) [Boron, trifluoro [oxybis [metane]]-, T-4- | 353–42–4 | 15,000 | b |
| Bromine | 7726–95–6 | 10,000 | a, b |
| Carbon disulfide | 75–15–0 | 20,000 | b |
| Chlorine | 7782–50–5 | 2,500 | a, b |
| Chlorine dioxide [Chlorine oxide (ClO2)] | 10049–04–4 | 1,000 | c |
| Chloroform [Methane, trichloro-] | 67–66–3 | 20,000 | b |
| Chloromethyl ether [Methane, oxybis[chloro-] | 542–88–1 | 1,000 | b |
| Chloromethyl methyl ether [Methane, chloromethoxy-] | 107–30–2 | 5,000 | b |
| Crotonaldehyde [2-Butenal] | 4170–30–3 | 20,000 | b |
| Crotonaldehyde, (E)- [2-Butenal, (E)-] | 123–73–9 | 20,000 | b |
| Cyanogen chloride | 506–77–4 | 10,000 | c |
| Cyclohexylamine [Cyclohexanamine] | 108–91–8 | 15,000 | b |
| Diborane | 19287–45–7 | 2,500 | b |
| Dimethyldichlorosilane [Silane, dichlorodimethyl-] | 75–78–5 | 5,000 | b |
| 1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] | 57–14–7 | 15,000 | b |
| Epichlorohydrin [Oxirane, (chloromethyl)-] | 106–89–8 | 20,000 | b |
| Ethylenediamine [1,2-Ethanediamine] | 107–15–3 | 20,000 | b |
| Ethyleneimine [Aziridine] | 151–56–4 | 10,000 | b |
| Ethylene oxide [Oxirane] | 75–21–8 | 10,000 | a, b |
| Fluorine | 7782–41–4 | 1,000 | b |
| Formaldehyde (solution) | 50–00–0 | 15,000 | b |
| Furan | 110–00–9 | 5,000 | b |
| Hydrazine | 302–01–2 | 15,000 | b |
| Hydrochloric acid (conc 37% or greater) | 7647–01–0 | 15,000 | d |
| Hydrocyanic acid | 74–90–8 | 2,500 | a, b |
| Hydrogen chloride (anhydrous) [Hydrochloric acid] | 7647–01–0 | 5,000 | a |
| Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] | 7664–39–3 | 1,000 | a, b |
| Hydrogen selenide | 7783–07–5 | 500 | b |
| Hydrogen sulfide | 7783–06–4 | 10,000 | a, b |
| Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] | 13463–40–6 | 2,500 | b |
| Isobutyronitrile [Propanenitrile, 2-methyl-] | 78–82–0 | 20,000 | b |
| Isopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester] | 108–23–6 | 15,000 | b |
| Methacrylonitrile [2-Propenenitrile, 2-methyl-] | 126–98–7 | 10,000 | b |
| Methyl chloride [Methane, chloro-] | 74–87–3 | 10,000 | a |
| Methyl chloroformate [Carbonochloridic acid, methylester] | 79–22–1 | 5,000 | b |
| Methyl hydrazine [Hydrazine, methyl-] | 60–34–4 | 15,000 | b |
| Methyl isocyanate [Methane, isocyanato-] | 624–83–9 | 10,000 | a, b |
| Methyl mercaptan [Methanethiol] | 74–93–1 | 10,000 | b |
| Methyl thiocyanate [Thiocyanic acid, methyl ester] | 556–64–9 | 20,000 | b |
| Methyltrichlorosilane [Silane, trichloromethyl-] | 75–79–6 | 5,000 | b |
| Nickel carbonyl | 13463–39–3 | 1,000 | b |
| Nitric acid (conc 80% or greater) | 7697–37–2 | 15,000 | b |
| Nitric oxide [Nitrogen oxide (NO)] | 10102–43–9 | 10,000 | b |
| Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide] 1 | 8014–95–7 | 10,000 | e |
| Peracetic acid [Ethaneperoxoic acid] | 79–21–0 | 10,000 | b |
| Perchloromethylmercaptan [Methanesulfenyl chloride, trichloro-] | 594–42–3 | 10,000 | b |
| Phosgene [Carbonic dichloride] | 75–44–5 | 500 | a, b |
| Phosphine | 7803–51–2 | 5,000 | b |
| Phosphorus oxychloride [Phosphoryl chloride] | 10025–87–3 | 5,000 | b |
| Phosphorus trichloride [Phosphorous trichloride] | 7719–12–2 | 15,000 | b |
| Piperidine | 110–89–4 | 15,000 | b |
| Propionitrile [Propanenitrile] | 107–12–0 | 10,000 | b |
| Propyl chloroformate [Carbonochloridic acid, propylester] | 109–61–5 | 15,000 | b |
| Propyleneimine [Aziridine, 2-methyl-] | 75–55–8 | 10,000 | b |
| Propylene oxide [Oxirane, methyl-] | 75–56–9 | 10,000 | b |
| Sulfur dioxide (anhydrous) | 7446–09–5 | 5,000 | a, b |
| Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] | 7783–60–0 | 2,500 | b |
| Sulfur trioxide | 7446–11–9 | 10,000 | a, b |
| Tetramethyllead [Plumbane, tetramethyl-] | 75–74–1 | 10,000 | b |
| Tetranitromethane [Methane, tetranitro-] | 509–14–8 | 10,000 | b |
| Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] | 7550–45–0 | 2,500 | b |
| Toluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-] 1 | 584–84–9 | 10,000 | a |
| Toluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-] 1 | 91–08–7 | 10,000 | a |
| Toluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl-] 1 | 26471–62–5 | 10,000 | a |
| Trimethylchlorosilane [Silane, chlorotrimethyl-] | 75–77–4 | 10,000 | b |
| Vinyl acetate monomer [Acetic acid ethenyl ester] | 108–05–4 | 15,000 | b |