# Table 2: Water-Reactive Materials Producing Toxic Gases - **operation:** document - **citation:** ERG 2024, Table 2: Water-Reactive Materials Producing Toxic Gases - **title:** Table 2: Water-Reactive Materials Producing Toxic Gases - **source type:** guidance - **agency:** U.S. DOT / Transport Canada / SICT - **status:** guidance - **official:** true - **published on:** 2024-04-04 - **effective on:** Not available - **summary:** Official ERG2024 table 2: water-reactive materials producing toxic gases guidance, pages 336-341. - **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-erg-2024-green-table-2.json - **markdown:** https://regulus.evalyn.ai/document/phmsa-erg-2024-green-table-2.md - **app url:** https://regulus.evalyn.ai/document/phmsa-erg-2024-green-table-2 - **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-04/ERG2024-Eng-Web-a.pdf#page=336 **body:** HOW TO USE TABLE 2 – WATER-REACTIVE MATERIALS WHICH PRODUCE TOXIC GASES Table 2 lists materials which produce large amounts of Toxic Inhalation Hazard (TIH) (PIH in the US) gases when spilled in water, and identifies the TIH gases produced. The materials are listed by order of ID number. These water-reactive materials are easily identified in Table 1 as their names are immediately followed by (when spilled in water). Note 1: Note 2: Note 3: The TIH gases indicated in Table 2 are for information purposes only. In Table 1, the initial isolation and protective action distances have already taken into consideration the TIH gases produced. For example: Table 2 indicates that UN1689 sodium cyanide, when spilled in water, will generate hydrogen cyanide gas (HCN). In Table 1, you must refer to the distances for sodium cyanide and not the distances for hydrogen cyanide gas. Some water-reactive materials are also TIH materials themselves (e.g., UN1746 (Bromine trifluoride), UN1836 (Thionyl chloride)). In these instances, two entries are provided in Table 1 for land-based and water-based spills. If a water-reactive material only has one entry in Table 1 for (when spilled in water), and the product is NOT spilled in water, Tables 1 and 2 do NOT apply. Refer only to the appropriate Orange Guide. Materials classified as a Division 4.3 are substances that, on contact with water, are liable to become spontaneously FLAMMABLE or give off FLAMMABLE or sometimes TOXIC gases in dangerous quantities. For the purpose of this table, water-reactive materials are materials that generate substantial quantities of TOXIC gases rapidly after a spill into water; therefore, a material classified as a Division 4.3 will not always be included in Table 2. Page 334 TABLE 2 - WATER-REACTIVE MATERIALS WHICH PRODUCE TOXIC GASES Materials Which Produce Large Amounts of Toxic-by-Inhalation (TIH) (PIH in the US) Gas(es) When Spilled in Water ID No. Guide No. Name of Material TIH Gas(es) Produced 1162 155 Dimethyldichlorosilane HCl 1183 139 Ethyldichlorosilane HCl 1196 155 Ethyltrichlorosilane HCl 1242 139 Methyldichlorosilane HCl 1250 155 Methyltrichlorosilane HCl 1295 139 Trichlorosilane HCl 1298 155 Trimethylchlorosilane HCl 1305 155P Vinyltrichlorosilane HCl 1340 139 Phosphorus pentasulfide, free from yellow and white phosphorus H2S 1340 139 Phosphorus pentasulphide, free from yellow and white phosphorus H2S 1360 139 Calcium phosphide PH3 1384 135 Sodium dithionite H2S SO2 1384 135 Sodium hydrosulfite H2S SO2 1384 135 Sodium hydrosulphite H2S SO2 1390 139 Alkali metal amides NH3 1397 139 Aluminum phosphide PH3 1419 139 Magnesium aluminum phosphide PH3 1432 139 Sodium phosphide PH3 1541 156 Acetone cyanohydrin, stabilized HCN 1680 157 Potassium cyanide, solid HCN 1689 157 Sodium cyanide, solid HCN 1716 156 Acetyl bromide HBr 1717 155 Acetyl chloride HCl 1724 155 Allyltrichlorosilane, stabilized HCl TABLE 2 Chemical Symbols for TIH (PIH in the US) Gases: Br2 Bromine HF Hydrogen fluoride Cl2 Chlorine HI Hydrogen iodide HBr Hydrogen bromide H2S Hydrogen sulfide HCl Hydrogen chloride H2S Hydrogen sulphide HCN Hydrogen cyanide NH3 Ammonia Use this list only when material is spilled in water. NO2 Nitrogen dioxide PH3 Phosphine SO2 Sulfur dioxide SO2 Sulphur dioxide Page 335 TABLE 2 - WATER-REACTIVE MATERIALS WHICH PRODUCE TOXIC GASES Materials Which Produce Large Amounts of Toxic-by-Inhalation (TIH) (PIH in the US) Gas(es) When Spilled in Water ID No. Guide No. Name of Material TIH Gas(es) Produced 1725 137 Aluminum bromide, anhydrous HBr 1726 137 Aluminum chloride, anhydrous HCl 1728 156 Amyltrichlorosilane HCl 1732 157 Antimony pentafluoride HF 1741 125 Boron trichloride HCl 1745 144 Bromine pentafluoride HF Br2 1746 144 Bromine trifluoride HF Br2 1747 155 Butyltrichlorosilane HCl 1752 156 Chloroacetyl chloride HCl 1753 156 Chlorophenyltrichlorosilane HCl 1754 137 Chlorosulfonic acid (with or without sulfur trioxide) HCl 1754 137 Chlorosulphonic acid (with or without sulphur trioxide) HCl 1758 137 Chromium oxychloride HCl 1762 156 Cyclohexenyltrichlorosilane HCl 1763 156 Cyclohexyltrichlorosilane HCl 1765 156 Dichloroacetyl chloride HCl 1766 156 Dichlorophenyltrichlorosilane HCl 1767 155 Diethyldichlorosilane HCl 1769 156 Diphenyldichlorosilane HCl 1771 156 Dodecyltrichlorosilane HCl 1777 137 Fluorosulfonic acid HF 1777 137 Fluorosulphonic acid HF 1781 156 Hexadecyltrichlorosilane HCl 1784 156 Hexyltrichlorosilane HCl Chemical Symbols for TIH (PIH in the US) Gases: Br2 Bromine HF Hydrogen fluoride Cl2 Chlorine HI Hydrogen iodide HBr Hydrogen bromide H2S Hydrogen sulfide HCl Hydrogen chloride H2S Hydrogen sulphide HCN Hydrogen cyanide NH3 Ammonia Page 336 Use this list only when material is spilled in water. NO2 Nitrogen dioxide PH3 Phosphine SO2 Sulfur dioxide SO2 Sulphur dioxide TABLE 2 - WATER-REACTIVE MATERIALS WHICH PRODUCE TOXIC GASES Materials Which Produce Large Amounts of Toxic-by-Inhalation (TIH) (PIH in the US) Gas(es) When Spilled in Water ID No. Guide No. Name of Material TIH Gas(es) Produced 1799 156 Nonyltrichlorosilane HCl 1800 156 Octadecyltrichlorosilane HCl 1801 156 Octyltrichlorosilane HCl 1804 156 Phenyltrichlorosilane HCl 1806 137 Phosphorus pentachloride HCl 1808 137 Phosphorus tribromide HBr 1809 137 Phosphorus trichloride HCl 1810 137 Phosphorus oxychloride HCl 1815 155 Propionyl chloride HCl 1816 155 Propyltrichlorosilane HCl 1818 157 Silicon tetrachloride HCl 1828 137 Sulfur chlorides HCl SO2 H2S 1828 137 Sulphur chlorides HCl SO2 H2S 1834 137 Sulfuryl chloride HCl 1834 137 Sulphuryl chloride HCl 1836 137 Thionyl chloride HCl SO2 1838 137 Titanium tetrachloride HCl 1898 156 Acetyl iodide HI 1923 135 Calcium dithionite H2S SO2 1923 135 Calcium hydrosulfite H2S SO2 1923 135 Calcium hydrosulphite H2S SO2 1929 135 Potassium dithionite H2S SO2 1929 135 Potassium hydrosulfite H2S SO2 1929 135 Potassium hydrosulphite H2S SO2 TABLE 2 Chemical Symbols for TIH (PIH in the US) Gases: Br2 Bromine HF Hydrogen fluoride Cl2 Chlorine HI Hydrogen iodide HBr Hydrogen bromide H2S Hydrogen sulfide HCl Hydrogen chloride H2S Hydrogen sulphide HCN Hydrogen cyanide NH3 Ammonia Use this list only when material is spilled in water. NO2 Nitrogen dioxide PH3 Phosphine SO2 Sulfur dioxide SO2 Sulphur dioxide Page 337 TABLE 2 - WATER-REACTIVE MATERIALS WHICH PRODUCE TOXIC GASES Materials Which Produce Large Amounts of Toxic-by-Inhalation (TIH) (PIH in the US) Gas(es) When Spilled in Water ID No. Guide No. Name of Material TIH Gas(es) Produced 1931 171 Zinc dithionite H2S SO2 1931 171 Zinc hydrosulfite H2S SO2 1931 171 Zinc hydrosulphite H2S SO2 2004 135 Magnesium diamide NH3 2011 139 Magnesium phosphide PH3 2012 139 Potassium phosphide PH3 2013 139 Strontium phosphide PH3 2308 157 Nitrosylsulfuric acid, liquid NO2 2308 157 Nitrosylsulphuric acid, liquid NO2 2353 155 Butyryl chloride HCl 2395 155 Isobutyryl chloride HCl 2434 156 Dibenzyldichlorosilane HCl 2435 156 Ethylphenyldichlorosilane HCl 2437 156 Methylphenyldichlorosilane HCl 2495 144 Iodine pentafluoride HF 2691 137 Phosphorus pentabromide HBr 2692 157 Boron tribromide HBr 2806 139 Lithium nitride NH3 2965 139 Boron trifluoride dimethyl etherate HF 2977 166 Radioactive material, uranium hexafluoride, fissile HF 2977 166 Uranium hexafluoride, radioactive material, fissile HF 2978 166 Radioactive material, uranium hexafluoride, non fissile or HF fissile‑excepted Chemical Symbols for TIH (PIH in the US) Gases: Br2 Bromine HF Hydrogen fluoride Cl2 Chlorine HI Hydrogen iodide HBr Hydrogen bromide H2S Hydrogen sulfide HCl Hydrogen chloride H2S Hydrogen sulphide HCN Hydrogen cyanide NH3 Ammonia Page 338 Use this list only when material is spilled in water. NO2 Nitrogen dioxide PH3 Phosphine SO2 Sulfur dioxide SO2 Sulphur dioxide TABLE 2 - WATER-REACTIVE MATERIALS WHICH PRODUCE TOXIC GASES Materials Which Produce Large Amounts of Toxic-by-Inhalation (TIH) (PIH in the US) Gas(es) When Spilled in Water ID No. Guide No. Name of Material TIH Gas(es) Produced 2978 166 Uranium hexafluoride, radioactive material, non fissile or HF fissile‑excepted 2985 155 Chlorosilanes, flammable, corrosive, n.o.s. 2986 155 Chlorosilanes, corrosive, flammable, n.o.s. 2987 156 Chlorosilanes, corrosive, n.o.s. 2988 139 Chlorosilanes, water-reactive, flammable, corrosive, n.o.s. HCl 3048 157 Aluminum phosphide pesticide 3361 156 Chlorosilanes, poisonous, corrosive, n.o.s. 3361 156 Chlorosilanes, toxic, corrosive, n.o.s. 3362 155 Chlorosilanes, poisonous, corrosive, flammable, n.o.s. HCl 3362 155 Chlorosilanes, toxic, corrosive, flammable, n.o.s. 3456 157 Nitrosylsulfuric acid, solid 3456 157 Nitrosylsulphuric acid, solid 3507 166 Uranium hexafluoride, radioactive material, excepted HCl HCl HCl PH3 HCl HCl HCl NO2 NO2 HF package, less than 0.1 kg per package, non-fissile or fissile-excepted 9191 143 Chlorine dioxide, hydrate, frozen Cl2 TABLE 2 Chemical Symbols for TIH (PIH in the US) Gases: Br2 Bromine HF Hydrogen fluoride Cl2 Chlorine HI Hydrogen iodide HBr Hydrogen bromide H2S Hydrogen sulfide HCl Hydrogen chloride H2S Hydrogen sulphide HCN Hydrogen cyanide NH3 Ammonia Use this list only when material is spilled in water. NO2 Nitrogen dioxide PH3 Phosphine SO2 Sulfur dioxide SO2 Sulphur dioxide Page 339 - **truncated:** false - **body characters:** 9262