Methyl acetylene
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CAS
74-99-7
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C3H4
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RTECS
UK4250000
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Synonyms & Trade Names
Allylene, Propine, Propyne, 1-Propyne
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DOT ID & Guide
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Exposure
Limits
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NIOSH REL: TWA 1000 ppm (1650 mg/m3)
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OSHA PEL: TWA 1000 ppm (1650 mg/m3)
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IDLH
1700 ppm [10%LEL]
See: 74997
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Conversion
1 ppm = 1.64 mg/m3
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Physical Description
Colorless gas with a sweet odor. [Note: A fuel that is shipped as a liquefied compressed gas.]
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MW: 40.1
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BP: -10°F
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FRZ: -153°F
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Sol: Insoluble
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VP: 5.2 atm
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IP: 10.36 eV
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RGasD: 1.41
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Fl.P: NA (Gas)
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UEL: ?
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LEL: 1.7%
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Flammable Gas
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Incompatibilities & Reactivities
Strong oxidizers (such as chlorine), copper alloys [Note: Can decompose explosively at 4.5 to 5.6 atmospheres of pressure.]
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Measurement Methods
NIOSH S84 (II-5)
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
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 1700 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 organic vapor canister/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; tremor, hyperexcitability, anesthesia; liquid: frostbite
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Target Organs
respiratory system, central nervous system
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See also: INTRODUCTION
See ICSC CARD: 0560 |
