Agent Name

Butene, all isomers

CAS Number

106-98-9; 107-01-7; 590-18-1; 624-64-6; 25167-67-3; 115-11-7

Formula

C4-H8

Major Category

Other Classes

Synonyms

Butene; Butylene; n-Butene; n-Butylene; trans-2-Butene; 2-Butene, (E)-; 2-trans-Butene; Low-boiling butene-2; beta-trans-Butylene; trans-1,2-Dimethylethylene; trans-Butene; cis-2-Butene; 2-Butene, (Z)-; High-boiling butene-2; beta-cis-Butylene; cis-1,2-Dimethylethylene; cis-Butene; 2-Butene; Butene-2; Butylene-2; Dimethylethylene; Pseudobutylene; beta-Butylene; Butene, mixed -1- and -2- isomers; 1-Butylene; But-1-ene; Ethylethylene; alpha-Butene; alpha-Butylene; 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; [ChemIDplus] UN1012; UN1075

Category

Aliphatics, Unsaturated

Description

A colorless liquefied gas; [Hawley]

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]

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]

Exposure Assessment
Skin Designation (ACGIH)

No

TLV (ACGIH)

250 ppm

Explanatory Notes

Carcinogenicity category is A4 for isobutene, CAS# 115-11-7. [ACGIH]

Adverse Effects
Neurotoxin

CNS Solvent Syndrome

Other Poison

Simple Asphyxiant

ACGIH Carcinogen

Not Classifiable

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Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: