Agent Name

Methylacetylene-propadiene mixture

Alternative Name

MAPP

CAS Number

59355-75-8

Major Category

Other Classes

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] See "Methylacetylene" and "Propadiene."

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

1000 ppm

STEL (ACGIH)

1250 ppm

PEL (OSHA)

1000 ppm

IDLH (NIOSH)

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%).

Odor Threshold Low

100 ppm

Explanatory Notes

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

Adverse Effects
Neurotoxin

CNS Solvent Syndrome

Other Poison

Simple Asphyxiant

Links to Other NLM Databases
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:

Processes

Industrial Processes with risk of exposure: