Methylacetylene
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]
Biomedical References
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;
NFPA
burn readily
Adverse Effects
Neurotoxin
Acute solvent syndrome
Diseases, Processes, and Activities Linked to This Agent
Diseases
Occupational diseases associated with exposure to this agent:
Processes
Industrial Processes with risk of exposure: