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Ketene																				Related Pages
Synonyms & Trade Names
			Carbomethene, Ethenone, Keto-ethylene
CAS No.
			463-51-4
	RTECS No.
			OA7700000
	DOT ID & Guide

FormulaCH2=CO
	Conversion
			1 ppm = 1.72 mg/m3
	IDLH
			5 ppmSee: 463514

Exposure Limits
			NIOSH RELTWA 0.5 ppm (0.9 mg/m3) ST 1.5 ppm (3 mg/m3)
					OSHA PEL TWA 0.5 ppm (0.9 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** S92 (II-2)
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with a penetrating odor.													
										
Molecular Weight42.0	
	Boiling Point-69°F
	Freezing Point-238°F
	SolubilityReacts
	Vapor Pressure>1 atm
	Ionization Potential9.61 eV											
Flash PointNA (Gas)
	Upper Explosive Limit?
	Lower Explosive Limit?
	Relative Gas Density1.45
Flammable Gas
Incompatibilities & Reactivities
			Water, alcohols, ammonia
					[Note: Readily polymerizes. Reacts with water to form acetic acid.]
Exposure Routes
			inhalation, skin and/or eye contact
Symptoms
			irritation eyes, skin, nose, throat, respiratory system; pulmonary edema
Target Organs
			Eyes, skin, respiratory system
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**No recommendation
							**Eyes:**No recommendation
							**Wash skin:**No recommendation
							**Remove:**No recommendation
							**Change:**No recommendation
	First Aid
			(See procedures)**Breathing:**Respiratory support
Respirator Recommendations
			**NIOSH/OSHA****Up to 5 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: 0812
					  MEDICAL TESTS: 0126

			
							

			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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Chemical Names, Synonyms and Trade Names
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CAS Numbers
RTECS Numbers
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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