| Agent Name |
Butene, all isomers |
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| CAS Number |
106-98-9; 107-01-7; 590-18-1; 624-64-6; 25167-67-3; 115-11-7 |
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| Formula |
C4-H8 |
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| Major Category |
Solvents |
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| Synonyms |
Butene; Butylene; n-Butene; n-Butylene(CAS:25167-67-3); trans-2-Butene; 2-Butene, (E)-; 2-trans-Butene; Low-boiling butene-2; beta-trans-Butylene; trans-1,2-Dimethylethylene; trans-Butene(CAS:624-64-6); cis-2-Butene; 2-Butene, (Z)-; High-boiling butene-2; beta-cis-Butylene; cis-1,2-Dimethylethylene; cis-Butene(CAS:590-18-1); 2-Butene; Butene-2; Butylene-2; Dimethylethylene; Pseudobutylene; beta-Butylene; Butene, mixed -1- and -2- isomers(CAS:107-01-7); 1-Butylene; But-1-ene; Ethylethylene; alpha-Butene; alpha-Butylene(CAS:106-98-9); Isobutylene; 1,1-Dimethylethene; 1,1-Dimethylethylene; 1-Propene, 2-methyl-; 2-Methyl-1-propene; 2-Methylpropene; 2-Methylpropylene; Isobutene; Isopropylidenemethylene; Propene, 2-methyl-; gamma-Butylene; sym-Dimethylethylene(CAS:115-11-7); [ChemIDplus] UN1012; UN1075 |
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| Category |
Aliphatics, Unsaturated |
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| Description |
A colorless liquefied gas; [Hawley] |
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| Sources/Uses |
Butenes are present in gasoline, vehicle exhaust, and urban air (<10 ppb); 2-Butene is used to make other chemicals. Isobutene is used to make MTBE, aviation fuel, butyl rubber, and other polymers. [ACGIH] 1-Butene is used as a co-monomer for high density polyethylene in blow-molding resins and as a monomer for polybutene in plastic pipe and film; [HSDB] |
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| Comments |
Single TLV for all isomers because they are often used as mixtures; Butene causes anesthesia in animal experiments. Respiratory arrest occurs in the range of 210,000 to 320,000 ppm. [ACGIH] In a confined space spill, may displace air and act as simple asphyxiant; Evaporating liquid can cause frostbite; [CHEMINFO]; May cause central nervous system effects including unconsciousness; [ICSC] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
250 ppm |
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| Explanatory Notes |
Carcinogenicity category is A4 for isobutene, CAS# 115-11-7. [ACGIH] |
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| Flammability (NFPA) |
4: burns readily |
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| Adverse Effects |
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| Neurotoxin |
CNS Solvent Syndrome |
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| Other Poison |
Simple Asphyxiant |
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| Links to Other NLM Databases |
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