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| Methyl acetylene | CAS 74-99-7 | ||
| C3H4 | RTECS UK4250000 | ||
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Synonyms & Trade Names Allylene, Propine, Propyne, 1-Propyne |
DOT ID & Guide |
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Exposure Limits |
NIOSH REL: TWA 1000 ppm (1650 mg/m3) | ||
| OSHA PEL: TWA 1000 ppm (1650 mg/m3) | |||
| IDLH 1700 ppm [10%LEL] | 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 |
BP: -10°F |
FRZ: -153°F |
Sol: Insoluble |
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VP: 5.2 atm |
IP: 10.36 eV |
RGasD: 1.41 |
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Fl.P: NA (Gas) |
UEL: ? |
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) |
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Personal Protection & Sanitation Skin: Frostbite Eyes: Frostbite Wash skin: No recommendation Remove: When wet (flammable) Change: No recommendation Provide: Frostbite |
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 |
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| Exposure Routes inhalation, skin and/or eye contact (liquid) | |
| 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 |