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Carbon monoxide																				Related Pages
Synonyms & Trade Names
			Carbon oxide, Flue gas, Monoxide
CAS No.
			630-08-0
	RTECS No.
			FG3500000
	DOT ID & Guide
			1016 1199202 168(cryogenic liquid)

FormulaCO
	Conversion
			1 ppm = 1.15 mg/m3
	IDLH
			1200 ppmSee: 630080

Exposure Limits
			NIOSH RELTWA 35 ppm (40 mg/m3) C 200 ppm (229 mg/m3)
					OSHA PEL TWA 50 ppm (55 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** 6604;**OSHA** ID209 , ID210
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless, odorless gas.
					[Note: Shipped as a nonliquefied or liquefied compressed gas.]													
										
Molecular Weight28.0	
	Boiling Point-313°F
	Melting Point-337°F
	Solubility2%
	Vapor Pressure>35 atm
	Ionization Potential14.01 eV											
Flash PointNA (Gas)
	Upper Explosive Limit74%
	Lower Explosive Limit12.5%
	Relative Gas Density0.97
Flammable Gas
Incompatibilities & Reactivities
			Strong oxidizers, bromine trifluoride, chlorine trifluoride, lithium
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			headache, tachypnea, nausea, lassitude (weakness, exhaustion), dizziness, confusion, hallucinations; cyanosis; depressed S-T segment of electrocardiogram, angina, syncope
Target Organs
			cardiovascular system, lungs, blood, 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****Up to 350 ppm**: (APF = 10) Any supplied-air respirator**Up to 875 ppm**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode**Up to 1200 ppm**: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern†(APF = 50) Any self-contained breathing apparatus with a full facepiece(APF = 50) Any supplied-air respirator 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 canister providing protection against the compound of concern†Any appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0023
					  MEDICAL TESTS: 0040

			
							

			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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