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Acetylene																				Related Pages
Synonyms & Trade Names
			Ethine, Ethyne
					[Note: A compressed gas used in the welding & cutting of metals.]
CAS No.
			74-86-2
	RTECS No.
			AO9600000
	DOT ID & Guide
			1001 116

FormulaHC≡CH
	Conversion
			1 ppm = 1.06 mg/m3
	IDLH
			N.D.See: IDLH INDEX

Exposure Limits
			NIOSH RELC 2500 ppm (2662 mg/m3)
					OSHA PEL none
	Measurement Methods
			**NIOSH** Acetylene Crit. Doc.
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with a faint, ethereal odor.
					[Note: Commercial grade has a garlic-like odor. Shipped under pressure dissolved in acetone.]													
										
Molecular Weight26.0	
	Boiling PointSublimes
	Freezing Point-119°F (Sublimes)
	Solubility2%
	Vapor Pressure44.2 atm
	Ionization Potential11.40 eV											
Flash PointNA (Gas)
	Upper Explosive Limit100%
	Lower Explosive Limit2.5%
	Relative Gas Density0.91
Flammable Gas
Incompatibilities & Reactivities
			Zinc; oxygen & other oxidizing agents such as halogens
					[Note: Forms explosive acetylide compounds with copper, mercury, silver & brasses (containing more than 66% copper).]
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			headache, dizziness; asphyxia; liquid: frostbite
Target Organs
			central nervous system, respiratory 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:**Fresh air
Respirator Recommendations
			Not available.
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0089

			
							

			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
First Aid Procedures Follow NIOSH Facebook
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