Methyl acetylene-propadiene mixture
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CAS
59355-75-8
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C3H4
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RTECS
UK4920000
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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
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DOT ID & Guide
1060 116P (stabilized)
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Exposure
Limits
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NIOSH REL: TWA 1000 ppm (1800 mg/m3) ST 1250 ppm (2250 mg/m3)
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OSHA PEL†: TWA 1000 ppm (1800 mg/m3)
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IDLH
3400 ppm [10%LEL]
See: 59355758
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Conversion
1 ppm = 1.64 mg/m3
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Physical Description
Colorless gas with a strong, characteristic, foul odor. [Note: A fuel that is shipped as a liquefied compressed gas.]
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MW: 40.1
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BP: -36 to -4°F
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FRZ: -213°F
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Sol: Insoluble
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VP: >1 atm
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IP: ?
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RGasD: 1.48
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Fl.P: NA (Gas)
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UEL: 10.8%
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LEL: 3.4%
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Flammable Gas
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Incompatibilities & Reactivities
Strong oxidizers, copper alloys [Note: Forms explosive compounds at high pressure in contact with alloys containing more than 67% copper.]
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Measurement Methods
NIOSH S85 (II-6); OSHA 7
See: NMAM or OSHA Methods
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Personal Protection & Sanitation (See protection codes)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash
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First Aid (See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support
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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
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Exposure Routes
inhalation, skin and/or eye contact (liquid)
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Symptoms
Irritation respiratory system; excitement, confusion, anesthesia; liquid: frostbite
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Target Organs
respiratory system, central nervous system
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