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Diazomethane																				Related Pages
Synonyms & Trade Names
			Azimethylene, Azomethylene, Diazirine
CAS No.
			334-88-3
	RTECS No.
			PA7000000
	DOT ID & Guide

FormulaCH2N2
	Conversion
			1 ppm = 1.72 mg/m3
	IDLH
			2 ppmSee: 334883

Exposure Limits
			NIOSH RELTWA 0.2 ppm (0.4 mg/m3)
					OSHA PEL TWA 0.2 ppm (0.4 mg/m3)
	Measurement Methods
			**NIOSH** 2515
					
					See: NMAM or OSHA Methods
										
Physical Description
			Yellow gas with a musty odor.
					[Note: Shipped as a liquefied compressed gas.]													
										
Molecular Weight42.1	
	Boiling Point-9°F
	Freezing Point-229°F
	SolubilityReacts
	Vapor Pressure>1 atm
	Ionization Potential9.00 eV											
Flash PointNA (Gas)
	Upper Explosive Limit?
	Lower Explosive Limit?
	Relative Gas Density1.45
Flammable Gas [EXPLOSIVE!]
Incompatibilities & Reactivities
			Alkali metals, water, drying agents such as calcium arsenate
					[Note: May explode violently on heating, exposure to sunlight, or contact with rough edges such as ground glass.]
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			irritation eyes; cough, short breath; headache, lassitude (weakness, exhaustion); flush skin, fever; chest pain, pulmonary edema, pneumonitis; asthma; liquid: frostbite
Target Organs
			Eyes, 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:**Respiratory support
Respirator Recommendations
			**NIOSH/OSHA****Up to 2 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: 1256
					  MEDICAL TESTS: 0068

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
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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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