Methylacetylene-propadiene mixture

Synonyms

MAPP gas; Methyl acetylene-allene mixture; Methyl acetylene-propadiene mixture (stabilized); Propadiene-methyl acetylene; Propyne-allene mixture; Propyne-propadiene mixture; [NIOSH] UN1060 UN1954

Category

Aliphatics, Unsaturated

Description

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

Sources/Uses

Used as fuel for industrial cutting; [ACGIH]

Comments

Possible frostbite from contact with liquid; [NIOSH] MAPP gas is an explosive hazard. Reduce hazard by keeping concentrations below 10% of lower explosive limit (3400 ppm). It can cause anesthetic effects and at very high concentrations, asphyxiation. At an exposure level of 5000 ppm 7 hours/day, 5 days/week, experimental animals show decreased body weight. [ACGIH] Classified as "Simple asphyxiant"; [CAMEO] Methylacetylene-propadiene mixture, stabilized (UN1060) has warning of explosive polymerization; [ERG 2016] See "Methylacetylene" and "Propadiene."

Biomedical References

Insufficient data

1000 ppm

1250 ppm

1000 ppm

3400 ppm

Excerpts from Documentation for IDLHs

Basis for revised IDLH: Since a methyl acetylene­propadiene mixture appears to have relatively low toxicity, and based on an analogy to methyl acetylene [ACGIH 1991], the revised IDLH is 3,400 ppm based strictly on safety considerations (i.e., being 10% of the lower explosive limit of 3.4%).

100 ppm

Yes

Explanatory Notes

Explosion hazard; Reported odor threshold of 100 ppm; [ACGIH]

Acute solvent syndrome

Other Poison

Simple Asphyxiant

Diseases

Occupational diseases associated with exposure to this agent:

• Asphyxiation, simple
• Solvents, acute toxic effect

Processes

Industrial Processes with risk of exposure:

• Gas Welding and Cutting