Toxic and Hazardous Gas Classifications Chart
| Gas | Molecular Formula | CAS | Physical State & Description | Description | Hazards | Hazard Class | Synonyms | Notes |
|---|---|---|---|---|---|---|---|---|
| Acetylene | C2H2 | 74-86-2 | Dissolved gas – Colorless | Colorless, mild ethereal | Flammable, unstable, reactive | 4 | Ethyne; Ethine; Narcylen; C2H2; Acetylen; Vinylene | ACGIH TLV (United States, 3/2019). Oxygen Depletion [Asphyxiant]. Explosive potential. |
| Ammonia | NH3 | 7664-41-7 | Liquefied gas | Colorless, strong pungent odor | Corrosive, flammable, aquatic hazard, will form explosive mixtures with air | 4 | Ammonia; Anhydrous ammonia | ACGIH TLV (United States, 3/2017);TWA: 25 ppm 8 hours; TWA: 17 mg/m³ 8 hours; STEL: 35 ppm 15 minutes; STEL: 24 mg/m³ 15 minutes. NIOSH REL (United States, 10/2016); TWA: 25 ppm 10 hours; TWA: 18 mg/m³ 10 hours; STEL: 35 ppm 15 minutes; STEL: 27 mg/m³ 15 minutes. OSHA PEL (United States, 6/2016); TWA: 50 ppm 8 hours; TWA: 35 mg/m³ 8 hours. |
| Argon | Ar | 7440–37–1 | Compressed gas | Colorless, odorless | Simple asphyxiant | 1 | Argon-40; Argon, isotope of mass 40; 40Ar; ARGON; Argon,Welding Quality; ARGON, COMPRESSED | |
| Arsine | AsH3 | 7784–42–1 | Compressed gas | Colorless, garlic or fish-like scent | Highly toxic, flammable, pyrophoric | 4 | Hydrogen arsenide; Arsenous hydride; Arseniuretted hydrogen; Arsenic trihydride; Arsenic hydride; Arsan; Arsenic tryhydride; arsenide hydrogen | ACGIH TLV (United States, 3/2017): TWA: 0.005 ppm 8 hours. NIOSH REL (United States, 10/2016): CEIL: 0.002 mg/m³ 15 minutes. OSHA PEL (United States, 6/2016): TWA: 0.2 mg/m³ 8 hours; TWA: 0.05 ppm 8 hours. |
| Boron tribromide | BBr3 | 10294–33–4 | Liquid | Colorless | Toxic, corrosive | 3 | ACGIH TLV (United States): 0.7 ppm; NIOSH REL (United States) 1ppm | |
| Boron trichloride | BCl3 | 10294–34–5 | Compressed gas | Colorless | Corrosive; reproductive toxin; water reactive | 2 | ACGIH TLV (United States): 0.7 ppm; | |
| Boron trifluoride | BF3 | 7637–07–2 | Compressed gas | Colorless, strong irritating pungent odor | Toxic, corrosive | 3 | Boron trifluoride; Boron fluoride (BF3); Boron fluoride; Trifluoroborane; Trifluoroboron; BF3; Fluorure de bore; UN 1008; Leecure b series | ACGIH TLV (United States, 3/2019): C: 0.7 ppm; TWA: 0.1 ppm 8 hours. NIOSH REL (United States, 10/2016): CEIL: 3 mg/m³; CEIL: 1 ppm OSHA PEL (United States, 5/2018): CEIL: 3 mg/m³; CEIL: 1 ppm |
| Bromine | Br2 | 7726–95–6 | Liquid | Brownish red liquid, suffocating odor | Highly toxic, corrosive, oxidizer | 4 | ACGIH TLV (United States): C: 0.1 ppm; TWA: 0.1 ppm 8 hours. STEL: 0.2 ppm NIOSH REL (United States): TWA 0.7 mg/m³; CEIL: 0.7 ppm OSHA PEL (United States): TWA: 0.7 mg/m³; TWA: 0.1 ppm |
|
| Carbon dioxide | CO2 | 124-38-9 | Compressed gas | Colorless, odorless, tasteless | Simple asphyxiant | 1 | Carbonic, Carbon Dioxide, Carbonic Anhydride, R744, Carbon Dioxide USP | ACGIH TLV (United States, 3/2017). Oxygen Depletion [Asphyxiant]: STEL: 54000 mg/m³ 15 minutes; STEL: 30000 ppm 15 minutes; TWA: 9000 mg/m³ 8 hours.; TWA: 5000 ppm 8 hours. NIOSH REL (United States, 10/2016): STEL: 54000 mg/m³ 15 minutes; STEL: 30000 ppm 15 minutes; WA: 9000 mg/m³ 10 hours; TWA: 5000 ppm 10 hours. OSHA PEL (United States, 6/2016): TWA: 9000 mg/m³ 8 hours: TWA: 5000 ppm 8 hours |
| Carbon monoxide | CO | 630–08–0 | Compressed gas | Colorless, odorless | Toxic, flammable | 2 | Monoxide; Flue gas; Carbon oxide; carbonic oxide; Monoxide of carbon; Carbon monooxide | ACGIH TLV (United States, 3/2019): TWA: 25 ppm 8 hours; TWA: 29 mg/m³ 8 hours. NIOSH REL (United States, 10/2016): TWA: 35 ppm 10 hours; TWA: 40 mg/m³ 10 hours; CEIL: 200 ppm; CEIL: 229 mg/m³ OSHA PEL (United States, 5/2018): TWA: 50 ppm 8 hours; TWA: 55 mg/m³ 8 hours. |
| Chlorine | Cl2 | 7782–50–5 | Compressed gas | Greenish-yellow, pungent odor similar to bleach; suffocating odor | Toxic, corrosive, oxidizer | 3 | Molecular chlorine; CHLORINE GAS; active chlorine released from chlorine; Dichlorine; Dichlor; Diatomic chlorine; Chlorine molecule; Chlorine mol.; Chlor mol.; Chlorine, liquefied; Liquid chlorine | ACGIH TLV (United States, 3/2019): STEL: 2.9 mg/m³ 15 minutes; STEL: 0.4 ppm 15 minutes; TWA: 1.5 mg/m³ 8 hours; TWA: 0.1 ppm 8 hours. NIOSH REL (United States, 10/2016): CEIL: 1.45 mg/m³ 15 minutes; CEIL: 0.5 ppm 15 minutes. OSHA PEL (United States, 5/2018): CEIL: 3 mg/m³; CEIL: 1 ppm |
| Chlorine dioxide | ClO2 | 10049–04–4 | Gas | reddish yellow gas, Chlorine-like odor | Toxic, oxidizer, corrosive | 3 | Chlorine oxide, Chlorine peroxide | NIOSH REL (United States):TWA 0.1 ppm; ST 0.3 ppm OSHA PEL (United States): TWA 0.1 ppm; TWA 0.3 mg/m3 |
| Chlorine trifluoride | ClF3 | 7790–91–2 | Liquefied gas | Colorless, strong irritating odor | Toxic, oxidizer, corrosive | 3 | Chlorine fluoride, Chlorotrifluoride | NIOSH REL: C 0.1 ppm (0.4 mg/m³) OSHA PEL: C 0.1 ppm (0.4 mg/m³) |
| Deuterium | H2 | 7782-39-0 | Compressed gas | Colorless, mild, sweetish odor | Flammable. Asphyxiant | 1 | Heavy hydrogen | |
| Diborane | B2H6 | 19278–45–7 | Liquefied gas | Colorless, repulsively sweet odor | Highly toxic, flammable, pyrophoric | 4 | ACGIH TLV (United States, 3/2012): TWA: 0.11 mg/m³ 8 hours; TWA: 0.1 ppm 8 hours. NIOSH REL (United States, 1/2013): TWA: 0.1 mg/m³ 10 hours; TWA: 0.1 ppm 10 hours. OSHA PEL (United States, 6/2010): TWA: 0.1 mg/m³ 8 hours; TWA: 0.1 ppm 8 hours. LC 50 = 58 ppm (1 hr) |
|
| Dichlorosilane | SiH2Cl2 (HCl) | 4109–96–0 | Liquefied gas | Colorless, acidic odor | Toxic, corrosive, flammable | 4 | Silane, dichloro- | LC 50 = 314 ppm (1 hr) |
| Ethane | C2H6 | 74-84-0 | Compressed gas | Colorless, odorless | Flammable, Asphyxiant | 4 | DIMETHYL; Ethyl hydride; Methylmethane; Bimethyl; Ethyl hidride | |
| Ethylene | C2H4 | 74-85-1 | Compressed gas | Colorless, sweet musky odor | Flammable | 4 | Ethene; Ethene (ethylene); ethylene liquefied, impure; ethylene, pure; ethylene in gaseous state, impure; Acetene; Bicarburretted hydrogen; Elayl; Olefiant gas; Ethane; Bicarburetted hydrogen | ACGIH TLV (United States, 3/2019): TWA: 200 ppm 8 hours. |
| Ethylene oxide | C2H40 | 75–21–8 | Liquefied gas | Colorless, faintly sweet odor | Toxic, flammable | 4 | oxirane; Oxirane (ethylene oxide); 1,2-Epoxy ethane; Dimethylene oxide; epoxyethane; Ethylene oxide (I,T); Oxirane (I,T); ETHYLENE OXIDE–NLFG; Ethylene oxide (ISO); Anproline; Amprolene | ACGIH TLV (United States, 3/2019): TWA: 1 ppm 8 hours. NIOSH REL (United States, 10/2016): CEIL: 9 mg/m³ 10 minutes; CEIL: 5 ppm 10 minutes; TWA: 0.18 mg/m³ 10 hours; TWA: 0.1 ppm 10 hours. OSHA PEL (United States, 5/2018); STEL: 5 ppm 15 minutes; TWA: 1 ppm 8 hours. LC 50 = 800 ppm (4 hr) |
| Fluorine | F2 | 7782–41–4 | Compressed gas | Pale yellow, strong, irritating, pungent odor | Highly toxic, corrosive, oxidizer | 4 | ACGIH TLV (United States, 3/2012): STEL: 3.1 mg/m³ 15 minutes; STEL: 2 ppm 15 minutes; TWA: 1.6 mg/m³ 8 hours; TWA: 1 ppm 8 hours. NIOSH REL (United States, 1/2013): TWA: 0.2 mg/m³ 10 hours; TWA: 0.1 ppm 10 hours. OSHA PEL (United States, 6/2010): TWA: 0.2 mg/m³ 8 hours; TWA: 0.1 ppm 8 hours.A LC 50 = 185 ppm (1 hr) |
|
| Germane | GeH4 | 7782–65–2 | Liquefied gas | Colorless | Highly toxic, flammable, pyrophoric | 4 | Germane 12.44-20% / Hydrogen 80-87% | ACGIH TLV (United States, 3/2012): TWA: 0.63 mg/m³ 8 hours; TWA: 0.2 ppm 8 hours. NIOSH REL (United States, 1/2013); TWA: 0.6 mg/m³ 10 hours; TWA: 0.2 ppm 10 hours. LC 50 = 622 ppm (1 hr) |
| Helium | He | 7440-59-7 | Compressed or Liquefied gas | Colorless, odorless | Simple asphyxiant | 1 | helium (dot); Helium-4; He; o-Helium; UN 1046,Helium USP | ACGIH TLV (United States, 3/2016). Notes: as Se. TWA: 0.16 mg/m³, (as Se) 8 hours; TWA: 0.05 ppm, (as Se) 8 hours. NIOSH REL (United States, 10/2013). Notes: as Se. TWA: 0.2 mg/m³, (as Se) 10 hours; TWA: 0.05 ppm, (as Se) 10 hours. OSHA PEL (United States, 2/2013). Notes: as Se.TWA: 0.2 mg/m³, (as Se) 8 hours; TWA: 0.05 ppm, (as Se) 8 hours. LC 50 = 51 ppm (1 hr) |
| Hydrogen sulfide | H2S | 7783–06–4 | Liquefied gas | Colorless, foul odor like rotten eggs | Toxic, flammable, corrosive | 4 | Hydrogen sulfide; Sulfuretted hydrogen; Sewer gas; Hydrosulfuric acid; dihydrogen sulfide; hydrosulphuric acid; sulphuretted hydrogen; HYDROGEN SULFIDE H2S; Sulfur hydride; Hydrogen sulfide (H2S); Sulfuric acid | ACGIH TLV (United States, 3/2019): STEL: 5 ppm 15 minutes; TWA: 1 ppm 8 hours. NIOSH REL (United States, 10/2016): CEIL: 15 mg/m³ 10 minutes; CEIL: 10 ppm 10 minutes. OSHA PEL 1989 (United States, 3/1989): STEL: 21 mg/m³ 15 minutes; STEL: 15 ppm 15 minutes; TWA: 14 mg/m³ 8 hours; TWA: 10 ppm 8 hours. OSHA PEL Z2 (United States, 2/2013): AMP: 50 ppm 10 minutes; CEIL: 20 ppm LC 50 = 712 ppm (1 hr) |
| Krypton | Kr | 7439-90-9 | Compressed gas | Colorless, odorless, tasteless | Simple asphyxiant | 1 | ||
| Methane | CH3 | 74-82-8 | Compressed gas | Colorless, odorless | Flammable | 4 | Methane or natural gas; Marsh gas; Methyl hydride; CH4; Fire Damp | |
| Methyl bromide | CH3Br | 74–83–9 | Compressed gas | Colorless, odorless, nonflammable | Toxic, flammable | 4 | methylbromide; Methane, bromo-; Monobromomethane; halon-1001; Bromomthane; 1-Bromomethane; Methane monobrome; Methylium bromatum; Embafume; Mathane, bromo-; unsymmetrical dimethylhydrazine | ACGIH TLV (United States, 3/2019). Absorbed through skin. TWA: 3.9 mg/m³ 8 hours; TWA: 1 ppm 8 hours. OSHA PEL (United States, 5/2018). Absorbed through skin. CEIL: 80 mg/m³; CEIL: 20 ppm LC 50 = 850 ppm (1 hr) |
| Methyl chloride | CH3Cl | 74-87-3 | Compressed gas | Colorless, mildly sweet odor | Flammable | 4 | methyl chloride; Methane, chloro-; Methane, chloro- (methyl chloride); Monochloromethane; methyl chloride; R40; Methyl chloride (I,T); Methane, chloro- (I, T); Chloride of methyl; Methane monochlore; Methylium chloratum; chloromethyl | ACGIH TLV (United States, 3/2017): Absorbed through skin. TWA: 50 ppm 8 hours;TWA: 103 mg/m³ 8 hours; STEL: 100 ppm 15 minutes; STEL: 207 mg/m³ 15 minutes. OSHA PEL 1989 (United States, 3/1989): TWA: 50 ppm 8 hours; TWA: 105 mg/m³ 8 hours; STEL: 100 ppm 15 minutes; STEL: 210 mg/m³ 15 minutes. OSHA PEL Z2 (United States, 2/2013): TWA: 100 ppm 8 hours; CEIL: 200 ppm; AMP: 300 ppm 5 minutes. LC 50 = 8300 ppm (4 hr) |
| Methyl isocyanate | CH3NCO | 624-83-9 | Liquid | Colorless, sharp pungent odor | Highly toxic, flammable | 4 | methyl ester of isocyanic acid; MIC; isocyanatomethane | ACGIH TLV (United States, 2013): TWA: 0.02 ppm 8 hours; STEL: 0.06 ppm 8 hours OSHA PEL (United States) TWA: 0.02 ppm (0.05 mg/m3) 8 hours NIOSH REL (United States): TWA 0.02 ppm (0.05 mg/m3) 10 hours LC 50 = 12. 2 mg/l (6 hr) |
| Methyl mercaptan | CH3SH | 74–93–1 | Liquefied gas | Colorless, cabbage-like odor | Toxic, flammable | 4 | Methyl mercaptan; Mercaptomethane; CH3SH; Methyl sulfhydrate; Methyl thioalcohol; Mercaptan methylique; Methaanthiol; Methanthiol; Methvtiolo; Methylmercaptaan; Metilmercaptano; Rcra waste number U153; Thiomethanol; UN 1064; Methanethiole | ACGIH TLV (United States, 3/2012).TWA: 0.98 mg/m³ 8 hours; TWA: 0.5 ppm 8 hours. NIOSH REL (United States, 1/2013); CEIL: 1 mg/m³ 15 minutes; CEIL: 0.5 ppm 15 minutes. OSHA PEL (United States, 6/2010). CEIL: 20 mg/m³; CEIL: 10 ppm LC 50 = 1350 ppm (1 hr) |
| Neon | Ne | 7440-01-9 | Compressed gas | Colorless, odorless, tasteless | Simple asphyxiant | 1 | Ne; UN 1065 | |
| Nickel carbonyl | Ni(CO)4 | 13463–39–3 | Liquid | Forbidden at UTD | Musty or sooty odor | 4 | Nickel Tetracarbonyl; Tetracarbonyl Nickel | ACGIH TLV (United States, 2013): C 0.05 mg/m3 NIOSH REL (United States): TWA: 0.001 ppm (10 hr) OSHA PEL (United States) : TWA: 0.001 ppm (8 hr) IDLH = 2 ppm |
| Nitric oxide | NO | 10102–43–9 | Compressed gas | Colorless, sharp unpleasant, irritating odor | Highly toxic, oxidizer, corrosive | 4 | Nitrogen oxide; Nitrogen monoxide; Nitrosyl radical; NO; Amidogen, oxo | ACGIH TLV (United States, 3/2017): TWA: 25 ppm 8 hours; TWA: 31 mg/m³ 8 hours. NIOSH REL (United States, 10/2016): TWA: 25 ppm 10 hours; TWA: 30 mg/m³ 10 hours. OSHA PEL (United States, 6/2016): TWA: 25 ppm 8 hours; TWA: 30 mg/m³ 8 hours. LC 50 = 115 ppm (1 hr) |
| Nitrogen | N2 | 7727-37-9 | Compressed or Liquefied gas | Colorless, odorless, tasteless | Simple asphyxiant | 1 | Nitrogen (dot); Nitrogen gas; Nitrogen NF, Nitrogen FG | |
| Nitrogen dioxide | NO2 | 10102–44–0 | Liquefied gas | Yellowish-brown, reddish-brown color, pungent, irritating odor | Highly toxic, oxidizer, corrosive | 4 | Nitrogen oxide; Nitrogen dioxide (dinitrogen tetroxide); Nitrogen oxide (NO2); Nitrogen peroxide; Dinitrogen tetroxide | ACGIH TLV (United States, 6/2013): STEL: 9.4 mg/m³ 15 minutes; STEL: 5 ppm 15 minutes; TWA: 5.6 mg/m³ 8 hours; TWA: 0.2 ppm 8 hours. NIOSH REL (United States, 4/2013): STEL: 1.8 mg/m³ 15 minutes; STEL: 1 ppm 15 minutes. OSHA PEL (United States, 2/2013): CEIL: 9 mg/m³; CEIL: 5 ppm LC 50 = 115 ppm (1 hr) |
| Nitrous oxide | N2O | 10024-97-2 | Compressed gas | Colorless, faint sweet odor | Oxidizer | 1 | Nitrogen oxide; Nitrous oxide; Laughing gas; Hyponitrous acid anhydride; Dinitrogen monoxide; NITROGEN OXIDE (N2O); FACTITIOUS AIR; Nitrogen monoxide; Hyponitrous oxide | ACGIH TLV (United States, 3/2019): TWA: 90 mg/m³ 8 hours; TWA: 50 ppm 8 hours. NIOSH REL (United States, 10/2016): TWA: 46 mg/m³ 10 hours; TWA: 25 ppm 10 hours. |
| Oxygen | O2 | 7782-44-7 | Compressed gas | Colorless, odorless, tasteless | Oxidizer | 1 | Molecular oxygen; Oxygen molecule; Pure oxygen; O2; UN 1072; Dioxygen; Oxygen USP, Aviator’s Breathing Oxygen (ABO) | |
| Ozone | O3 | 10028-15-6 | In situ, dissolved gas | Colorless, sharp odor | Highly toxic, oxidizer | 4 | Triatomic Oxygen, Trioxygen, O3 | ACGIH TLV (United States): TWA: 0.1 ppm 8 hours; STEL: 0.3 ppm 8 hours. NIOSH REL (United States): TWA: 0.2 ppm 2 hours; CEIL: 0.1 ppm OSHA PEL (United States): TWA: 0.1 ppm 8 hours IDLH = 5 ppm |
| Phosgene | COCl2 | 75–44–5 | Liquefied gas | Colorless, odor like freshly cut hay or grass | Highly toxic | 4 | carbonyl chloride; Carbonic dichloride; Phosgene (Carbonyl chloride); Chloroformyl chloride; Carbonyl dichloride; Carbon oxychloride; Diphosgene; Dichloroformaldehyde; Carbon dichloride oxide; CG; Phosgene Gas | ACGIH TLV (United States, 3/2017): TWA: 0.4 mg/m³ 8 hours; TWA: 0.1 ppm 8 hours. NIOSH REL (United States, 10/2016): CEIL: 0.8 mg/m³ 15 minutes; CEIL: 0.2 ppm 15 minutes; TWA: 0.4 mg/m³ 10 hours; TWA: 0.1 ppm 10 hours. OSHA PEL (United States, 6/2016): TWA: 0.4 mg/m³ 8 hours; TWA: 0.1 ppm 8 hours. LC 50 = 5 ppm (1 hr) |
| Phosphine | PH3 | 7803–51–2 | Liquefied gas | Colorless, fish or garlic odor | Highly toxic, flammable, pyrophoric | 4 | Trihydrogen phosphide; Hydrogen phosphide; Phosphorus trihydride; PH3; Phosphene; Phosphorus hydride; Celphos; Delicia; Detia; Detia gas ex-B; Fosforowodor; Gas-ex-B; Phosphorwasserstoff; Rcra waste number P096; UN 2199 | ACGIH TLV (United States, 3/2019): C: 0.15 ppm; TWA: 0.05 ppm 8 hours. NIOSH REL (United States, 10/2016): STEL: 1 mg/m³ 15 minutes; STEL: 1 ppm 15 minutes; TWA: 0.4 mg/m³ 10 hours; TWA: 0.3 ppm 10 hours. OSHA PEL (United States, 5/2018): TWA: 0.4 mg/m³ 8 hours; TWA: 0.3 ppm 8 hours. LC 50 = 22 ppm (1 hr) |
| Phosphorus oxychloride | POCl3 | 10025–87–3 | Liquid | Colorless; pungent odor | Highly toxic | 4 | Phosphoryl Chloride | ACGIH TLV (United States): TWA: 0.1 ppm 8 hours. NIOSH REL (United States): STEL: 3 mg/m³; STEL: 0.5 ppm; TWA: 0.6 mg/m³ 10 hours; TWA: 0.1 ppm. OSHA PEL (United States): TWA: 0.6 mg/m³ ; TWA: 0.1 ppm (vacated). LC 50 = 308 mg/m³ (4 hr) |
| Phosphorus pentafluoride | PF5 | 7647-19-0 | Liquefied gas | Colorless, strong, irritating, pungent odor | Toxic, oxidizer, corrosive | 3 | ACGIH TLV (United States): TWA: 2.5 mg/m³. NIOSH IDLH (United States): 250 mg/m³. OSHA PEL (United States): TWA: 2.5 mg/m³ (vacated). |
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| Phosphorus trichloride | PCl3 | 7719-12-2 | Liquid | Colorless fuming liquid, pungent odor | Toxic, corrosive | 3 | ACGIH TLV (United States): TWA: 0.2 ppm; STEL: 0.5 ppm NIOSH (United States): TWA: 1.5 mg/m³; TWA: 0.2 ppm; ST 0.5 ppm; ST 3 mg/m³ OSHA PEL (United States): TWA: 3 mg/m³; TWA 0.5 ppm LC 50 = 0.586 mg/l (4 h) |
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| Propane | C3H8 | 74-98-6 | Liquefied gas | Colorless, odorless but may have a skunk odor added | Flammable, asphyxiant | 4 | Propyl hydride; n-Propane; Dimethyl methane; Bottled gas; propane in gaseous state; propane liquefied, n-Propane; Dimethylmethane; Freon 290; Liquefied petroleum gas; Lpg; Propyl hydride; R 290; C3H8; UN 1075; UN 1978; A-108; Hydrocarbon propellant. | NIOSH REL (United States, 10/2016): TWA: 1800 mg/m³ 10 hours; TWA: 1000 ppm 10 hours. OSHA PEL (United States, 5/2018): TWA: 1800 mg/m³ 8 hours; TWA: 1000 ppm 8 hours. |
| Selenium hexafluoride | SeF6 | 7783–79–1 | Compressed gas | Colorless, strong, irritating, repulsive odor | Highly toxic, corrosive | 4 | ACGIH TLV (United States; 1992): TWA: 0.05 ppm NIOSH REL (United States): TWA: 0.05 ppm 10 hr OSHA PEL (United States): TWA: 0.4 mg/m³; TWA 0.05 ppm IDLH = 2 ppm |
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| Silane | SiH4 | 7803-62-5 | Compressed gas | Colorless, sharp repulsive odor | Pyrophoric, Flammable | 4 | Silicon tetrahydride; Silicane; Monosilane; silicon hydride; Tetrahydrure de silicium; Silicomethane | ACGIH TLV (United States, 3/2019): TWA: 6.6 mg/m³ 8 hours; TWA: 5 ppm 8 hours. NIOSH REL (United States, 10/2016): TWA: 7 mg/m³ 10 hours; TWA: 5 ppm 10 hours. OSHA PEL 1989 (United States, 3/1989): TWA: 7 mg/m³ 8 hours: TWA: 5 ppm 8 hours. LC 50 = 19000 ppm (1 hr) |
| Silicon tetrachloride | SiCl4 | 10026–04–7 | Liquid | Colorless fuming liquid, irritating odor | Toxic, corrosive | 4 | Silane, tetrachloro-; Silicon chloride; Tetrachlorosilane; Silicon(IV)chloride | AIHA WEEL (United States, 7/2018): CEIL: 1 ppm LC 50 = 750 ppm (1 hr) |
| Silicon tetrafluoride | SiF4 (HF) | 7783–61–1 | Compressed gas | Colorless, strong irritating disagreeable odor | Toxic, corrosive | 4 | Silane, tetrafluoro-; Silicon fluoride (SiF4); Tetrafluorosilane; SiF4; Silicon fluoride; UN185 | LC 50 = 922 ppm (1 hr) |
| Stibine | SbH3 | 7803–52–3 | Compressed gas | Colorless, odor like rotten eggs | Highly toxic, flammable | 4 | Antimony hydride; Antimony trihydride; Hydrogen antimonid | ACGIH TLV (United States, 2021): TWA: 0.005 ppm 8 hours. NIOSH REL (United States): TWA: 0.5 mg/m³ 10 hours; TWA: 0.1 ppm 10 hours. OSHA PEL (United States): TWA: 0.5 mg/m³ 8 hours: TWA: 0.1 ppm 8 hours. IDLH = 5 ppm |
| Sulfur dioxide | SO2 | 7446–09–5 | Liquefied gas | Colorless, pungent odor | Toxic, corrosive | 3 | Sulfur dioxide; Sulfur oxide; Sulfurous oxide; Sulfurous acid anhydride; E 220; Sulphurous acid anhydride; Sulfur superoxide; Sulfurous anhydride; Sulfur dioxide, anhydrous; Dioxide of sulfur; Sulphure dioxide; SULFUR DIOXIDE, LIQUID | ACGIH TLV (United States, 3/2019): STEL: 0.25 ppm 15 minutes. NIOSH REL (United States, 10/2016): TWA: 2 ppm 10 hours; TWA: 5 mg/m³ 10 hours; STEL: 5 ppm 15 minutes; STEL: 13 mg/m³ 15 minutes. OSHA PEL (United States, 5/2018): TWA: 5 ppm 8 hours; TWA: 13 mg/m³ 8 hours. LC 50 = 2520 ppm (1 hr) |
| Sulfur hexafluoride | SF6 | 2551-62-4 | Liquefied gas | colorless, odorless, tasteless | Simple asphyxiant | 2 | Sulfur fluoride, (OC-6-11)-; Sulfur fluoride (SF6), (OC-6-11)-; Sulfur fluoride (SF6); Sulfur hexafluoride; Sulfur fluoride; Sulfur (VI)fluoride; Hexafluorosulfur; SF6; SULFUR FLUORIDE,[OC-6-11]-SULFUR HEXAFLUORIDE; ISPAN SF6 | OSHA PEL Z2 (United States, 2/2013); TWA: 2.5 mg/m³ 8 hours. Form: Dust ACGIH TLV (United States, 3/2019): TWA: 5970 mg/m³ 8 hours; TWA: 1000 ppm 8 hours. NIOSH REL (United States, 10/2016); TWA: 6000 mg/m³ 10 hours; TWA: 1000 ppm 10 hours. OSHA PEL (United States, 5/2018); TWA: 6000 mg/m³ 8 hours; TWA: 1000 ppm 8 hours. |
| Sulfuryl fluoride | SO 2F2 | 2699–79–8 | Liquefied gas | Colorless, odorless, strong irritating | Toxic, corrosive | 4 | ACGIH TLV (United States, 3/2017): TWA: 5 ppm 8 hours; TWA: 21 mg/m³ 8 hours; STEL: 10 ppm 15 minutes; STEL: 42 mg/m³ 15 minutes. OSHA PEL 1989 (United States, 3/1989): TWA: 5 ppm 8 hours; TWA: 20 mg/m³ 8 hours; STEL: 10 ppm 15 minutes; STEL: 40 mg/m³ 15 minutes. NIOSH REL (United States, 10/2016): TWA: 5 ppm 10 hours; TWA: 20 mg/m³ 10 hours; STEL: 10 ppm 15 minutes; STEL: 40 mg/m³ 15 minutes. OSHA PEL (United States, 6/2016): TWA: 5 ppm 8 hours; TWA: 20 mg/m³ 8 hours. LC 50 = 991 ppm (4 hr) |
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| Tellurium hexafluoride | TeF6 | 7783–80–4 | Compressed gas | Colorless gas, repulsive odor, strong irritating | Highly toxic, corrosive | 4 | Tellurium fluoride | NIOSH REL (United States): TWA: 0.2 ppm; TWA: 0.2 mg/m³ OSHA PEL (United States): TWA: 0.2 ppm; TWA: 0.2 mg/m³ IDLH = 1 ppm |
| Titanium tetrachloride | TiCl4 | 7550–45–0 | Liquid | Colorless, yellow or reddish brown | Highly toxic, corrosive, water reactive | 4 | Titanium(IV) chloride | ACGIH TLC (United States): CEIL: 0.5 ppm LC 50 = 0.46 mg/L (4 hr) |
| Tungsten hexafluoride | WF6 (HF) | 7783–82–6 | Compressed gas | Light yellow, strong irritating | Toxic, corrosive | 3 | Tungsten(VI) fluoride | ACGIH TLV (United States): TWA: 2.5 mg/m³ OSHA PEL (United States): TWA: 2.5 mg/m³ NIOSH REL (United States): TWA: 5 mg/m³; ST: 10 mg/m³ LC 50 = 101 ppm (4 hr) |
| Vinyl bromide | C2H3Br | 593-60-2 | Liquefied gas | Colorless, sweet odor | Toxic, flammable | 4 | Bromoethylene | ACGIH TLV (United States): TWA: 0.5 ppm LD 50 = 500 mg/kg |
| Vinyl chloride | C2H3Cl | 75-01-4 | Liquefied gas | Colorless, sweet odor | Toxic, flammable | 4 | chloroethylene; Ethene, chloro-; Chloroethene; Vinyl chloride, monomer; Ethene, chloro- (vinyl chloride); Vinyl chloride monomer; Monochloroethylene; Monochloroethene; Ethylene monochloride; VCM; VC | ACGIH TLV (United States, 3/2017): TWA: 1 ppm 8 hours. OSHA PEL (United States, 6/2016): STEL: 5 ppm 15 minutes; TWA: 1 ppm 8 hours. LC 50 = 390 mg/L (2 hr) |
| Xenon | Xe | 7440-63-3 | Compressed gas | Colorless, odorless, tasteless | Simple asphyxiant | 2 | Xe; UN 2036 |