Methyl acetylene-propadiene mixture

Synonyms & Trade Names

MAPP gas, Methyl acetylene-allene mixture, Methyl acetylene-propadiene mixture (stabilized), Propadiene-methyl acetylene, Propyne-allene mixture, Propyne-propadiene mixture

CAS No.

59355-75-8

RTECS No.

UK4920000

DOT ID & Guide

1060 116P(stabilized)

Formula

CH₃≡CH/CH₂ =C=CH₂

Conversion

1 ppm = 1.64 mg/m³

IDLH

3400 ppm [10%LEL]
See: 59355758

Exposure Limits

NIOSH REL

TWA 1000 ppm (1800 mg/m³) ST 1250 ppm (2250 mg/m³)

OSHA PEL

TWA 1000 ppm (1800 mg/m³) See Appendix G

Measurement Methods

NIOSH S85 (II-6);
OSHA 7
See: NMAM or OSHA Methods

Physical Description

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

Molecular Weight

40.1

Boiling Point

-36 to -4°F

Freezing Point

-213°F

Solubility

Insoluble

Vapor Pressure

>1 atm

Ionization Potential

Flash Point

NA (Gas)

Upper Explosive Limit

10.8%

Lower Explosive Limit

3.4%

Relative Gas Density

1.48

Flammable Gas

Incompatibilities & Reactivities

Strong oxidizers, copper alloys [Note: Forms explosive compounds at high pressure in contact with alloys containing more than 67% copper.]

Exposure Routes

inhalation, skin and/or eye contact (liquid)

Symptoms

irritation respiratory system; excitement, confusion, anesthesia; liquid: frostbite

Target Organs

respiratory system, central nervous system

Personal Protection/Sanitation

(See protection codes)
Skin:Frostbite
Eyes:Frostbite
Wash skin:No recommendation
Remove:When wet (flammable)
Change:No recommendation
Provide:Frostbite wash

First Aid

(See procedures)
Eye:Frostbite
Skin:Frostbite
Breathing:Respiratory support

Respirator Recommendations

NIOSH/OSHA

Up to 3400 ppm:
(APF = 10) Any supplied-air respirator
(APF = 50) Any self-contained breathing apparatus with a full facepiece

Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

Methyl acetylene-propadiene mixture

NIOSH REL

OSHA PEL

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