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]

Flammability (NFPA)

4: Burns readily

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: