Agent Name

Isobutylene

Alternative Name

Isobutene

CAS Number

115-11-7

Formula

C4-H8

Major Category

Other Classes

Synonyms

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] UN1055

Category

Aliphatics, Unsaturated

Description

Colorless liquid or gas with odor of coal gas; [Hawley] Compressed gas with an unpleasant odor; [MSDSonline] Boiling point = -6.9 deg C; [HSDB]

Sources/Uses

Used to make trimers, polymers, antioxidants (foods, packaging, food supplements, and plastics), high-octane aviation gasoline, tert-butanol methacrylates and other resins; [HSDB]

Comments

In confined space spill, may displace air and act as simple asphyxiant; Evaporating liquid can cause frostbite; Inhalation of high concentrations can cause CNS depression; [ICSC] May cause irritation; Evaporating liquid can cause frostbite; In confined space spill, may displace air and act as simple asphyxiant; Inhalation of high concentrations can cause CNS depression and anesthesia; [MSDSonline] See "Butene, all isomers."

Exposure Assessment
Skin Designation (ACGIH)

No

TLV (ACGIH)

250 ppm

Lethal Concentration

LC50 (rat) = 620,000 mg/m3/4h

Explanatory Notes

Flash point = -76 deg C; [Hawley]

Adverse Effects
Neurotoxin

CNS Solvent Syndrome

Other Poison

Simple Asphyxiant

ACGIH Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent: