![[logo] US EPA](http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
List of Regulated Toxic Substances and Threshold Quantities for Accidental Release Prevention
77 Substances
(in alphabetical order)
| Chemical Name | CAS No. | Threshold (lbs.) |
| Acrolein [2-Propenal] | 107-02-8 | 5,000 |
| Acrylonitrile [2-Propenenitrile] | 107-13-1 | 20,000 |
| Acrylyl chloride [2-Propenoyl chloride] | 814-68-6 | 5,000 |
| Allyl alcohol [2-Propen-l-ol] | 107-18-61 | 15,000 |
| Allylamine [2-Propen-l-amine] | 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 |
| Boron trichloride [Borane, trichloro-] | 10294-34-5 | 5,000 |
| Boron trifluoride [Borane, trifluoro-] | 7637-07-2 | 5,000 |
| Boron trifluoride compound with methyl ether (1:1) [Boron, trifluoro [oxybis [metane]]-, T-4- | 353-42-4 | 15,000 |
| Bromine | 7726-95-6 | 10,000 |
| Carbon disulfide | 75-15-0 | 20,000 |
| Chlorine | 7782-50-5 | 2,500 |
| Chlorine dioxide [Chlorine oxide (ClO2)] | 10049-04-4 | 1,000 |
| Chloroform [Methane, trichloro-] | 67-66-3 | 20,000 |
| Chloromethyl ether [Methane, oxybis[chloro-] | 542-88-1 | 1,000 |
| Chloromethyl methyl ether [Methane, chloromethoxy-] | 107-30-2 | 5,000 |
| Crotonaldehyde [2-Butenal] | 4170-30-3 | 20,000 |
| Crotonaldehyde, (E)- [2-Butenal, (E)-] | 123-73-9 | 20,000 |
| Cyanogen chloride | 506-77-4 | 10,000 |
| Cyclohexylamine [Cyclohexanamine] | 108-91-8 | 15,000 |
| Diborane | 19287-45-7 | 2,500 |
| Dimethyldichlorosilane [Silane, dichlorodimethyl-] | 75-78-5 | 5,000 |
| 1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] | 57-14-7 | 15,000 |
| Epichlorohydrin [Oxirane, (chloromethyl)-] | 106-89-8 | 20,000 |
| Ethylenediamine [1,2-Ethanediamine] | 107-15-3 | 20,000 |
| Ethyleneimine [Aziridine] | 151-56-4 | 10,000 |
| Ethylene oxide [Oxirane] | 75-21-8 | 10,000 |
| Fluorine | 7782-41-4 | 1,000 |
| Formaldehyde (solution) | 50-00-0 | 15,000 |
| Furan | 110-00-9 | 5,000 |
| Hydrazine | 302-01-2 | 15,000 |
| Hydrochloric acid (conc 37% or greater) | 7647-01-0 | 15,000 |
| Hydrocyanic acid | 74-90-8 | 2,500 |
| Hydrogen chloride (anhydrous) [Hydrochloric acid] | 7647-01-0 | 5,000 |
| Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] | 7664-39-3 | 1,000 |
| Hydrogen selenide | 7783-07-5 | 500 |
| Hydrogen sulfide | 7783-06-4 | 10,000 |
| Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] | 13463-40-6 | 2,500 |
| Isobutyronitrile [Propanenitrile, 2-methyl-] | 78-82-0 | 20,000 |
| Isopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester] | 108-23-6 | 15,000 |
| Methacrylonitrile [2-Propenenitrile, 2-methyl-] | 126-98-7 | 10,000 |
| Methyl chloride [Methane, chloro-] | 74-87-3 | 10,000 |
| Methyl chloroformate [Carbonochloridic acid, methylester] | 79-22-1 | 5,000 |
| Methyl hydrazine [Hydrazine, methyl-] | 60-34-4 | 15,000 |
| Methyl isocyanate [Methane, isocyanato-] | 624-83-9 | 10,000 |
| Methyl mercaptan [Methanethiol] | 74-93-1 | 10,000 |
| Methyl thiocyanate [Thiocyanic acid, methyl ester] | 556-64-9 | 20,000 |
| Methyltrichlorosilane [Silane, trichloromethyl-] | 75-79-6 | 5,000 |
| Nickel carbonyl | 13463-39-3 | 1,000 |
| Nitric acid (conc 80% or greater) | 7697-37-2 | 15,000 |
| Nitric oxide [Nitrogen oxide (NO)] | 10102-43-9 | 10,000 |
| Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide]* | 8014-95-7 | 10,000 |
| Peracetic acid [Ethaneperoxoic acid] | 79-21-0 | 10,000 |
| Perchloromethylmercaptan [Methanesulfenyl chrolide, trichloro-] | 594-42-3 | 10,000 |
| Phosgene [Carbonic dichloride] | 75-44-5 | 500 |
| Phosphine | 7803-51-2 | 5,000 |
| Phosphorus oxychloride [Phosphoryl chloride] | 10025-87-3 | 5,000 |
| Phosphorus trichloride [Phosphorous trichloride] | 7719-12-2 | 15,000 |
| Piperidine | 110-89-4 | 15,000 |
| Propionitrile [Propanenitrile] | 107-12-0 | 10,000 |
| Propyl chloroformate [Carbonochloridic acid, propylester] | 109-61-5 | 15,000 |
| Propyleneimine [Aziridine, 2-methyl-] | 75-55-8 | 10,000 |
| Propylene oxide [Oxirane, methyl-] | 75-56-9 | 10,000 |
| Sulfur dioxide (anhydrous) | 7446-09-5 | 5,000 |
| Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] | 7783-60-0 | 2,500 |
| Sulfur trioxide | 7446-11-9 | 10,000 |
| Tetramethyllead [Plumbane, tetramethyl-] | 75-74-1 | 10,000 |
| Tetranitromethane [Methane, tetranitro-] | 509-14-8 | 10,000 |
| Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] | 7550-45-0 | 2,500 |
| Toluene -2,4-diisocyanate [Benzene, 2,4-diisocyanato-1- methyl-1* | 584-84-9 | 10,000 |
| Toluene -2,6-diisocyanate [Benzene, 1,3-diisocyanato-2- methyl-1]* | 91-08-7 | 10,000 |
| Toluene diisocyanate (unspecified isomer) [Benzene, 1,3- diisocyanatomethyl-]* | 26471-62-5 | 10,000 |
| Trimethylchlorosilane [Silane, chlorotrimethyl-] | 75-77-4 | 10,000 |
| Vinyl acetate monomer [Acetic acid ethenyl ester] | 108-05-4 | 15,000 |
* The mixture exemption in Section 68.115(b)(1) of the Code of Federal Regulations does
not apply to the substance.
