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Methyl acetylene																				Related Pages
Synonyms & Trade Names
			Allylene, Propine, Propyne, 1-Propyne
CAS No.
			74-99-7
	RTECS No.
			UK4250000
	DOT ID & Guide

FormulaC3H4
	Conversion
			1 ppm = 1.64 mg/m3
	IDLH
			1700 ppm [10%LEL]See: 74997

Exposure Limits
			NIOSH RELTWA 1000 ppm (1650 mg/m3)
					OSHA PEL TWA 1000 ppm (1650 mg/m3)
	Measurement Methods
			**NIOSH** S84 (II-5)
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with a sweet odor.
					[Note: A fuel that is shipped as a liquefied compressed gas.]													
										
Molecular Weight40.1	
	Boiling Point-10°F
	Freezing Point-153°F
	SolubilityInsoluble
	Vapor Pressure5.2 atm
	Ionization Potential10.36 eV											
Flash PointNA (Gas)
	Upper Explosive Limit?
	Lower Explosive Limit1.7%
	Relative Gas Density1.41
Flammable Gas
Incompatibilities & Reactivities
			Strong oxidizers (such as chlorine), copper alloys
					[Note: Can decompose explosively at 4.5 to 5.6 atmospheres of pressure.]
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			irritation respiratory system; tremor, hyperexcitability, 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 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 canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0560

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
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