Agent Name

Methylacetylene

Alternative Name

Propyne

CAS Number

74-99-7

Formula

C3-H4

Major Category

Other Classes

Synonyms

Allylene; Methyl acetylene; Propine; 1-Propyne; Propyne; [NIOSH] UN1954

Category

Aliphatics, Unsaturated

Description

Colorless gas with a sweet odor. [Note: A fuel that is shipped as a liquefied compressed gas]; [NIOSH]

Sources/Uses

Used as a welding fuel and chemical intermediate; [ACGIH]

Comments

High concentrations (42,000 ppm) cause anesthesia in experimental animals; An explosion hazard--maintain concentrations below !0% of lower explosion limit (1700 ppm): [ACGIH] Possible frostbite from contact with liquid; [NIOSH] A respiratory tract irritant; Inhalation of high concentrations can cause CNS depression; [ICSC]

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

1000 ppm

PEL (OSHA)

1000 ppm

IDLH (NIOSH)

1700 ppm

Excerpts from Documentation for IDLHs

Human data: It has been stated that methyl acetylene appears to be a general anesthetic with comparatively low toxicity [ACGIH 1991].

Lethal Concentration

LC (rat) > 42,000 ppm/6h

Explanatory Notes

IDLH = 10% LEL;

Flammability (NFPA)

4: Burns readily

Adverse Effects
Neurotoxin

CNS Solvent Syndrome

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

Search ChemIDplus

Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: