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Methyl acetylene-propadiene mixture

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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

See also
INTRODUCTION
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health