NIOSH Pocket Guide to Chemical Hazards

Carbon monoxide CAS 630-08-0
CO RTECS FG3500000
Synonyms & Trade Names
Carbon oxide, Flue gas, Monoxide
DOT ID & Guide
1016 119
9202 168 (cryogenic liquid)
Exposure
Limits
NIOSH REL: TWA 35 ppm (40 mg/m3) C 200 ppm (229 mg/m3)
OSHA PEL�: TWA 50 ppm (55 mg/m3)
IDLH 1200 ppm Conversion 1 ppm = 1.15 mg/m3
Physical Description
Colorless, odorless gas. [Note: Shipped as a nonliquefied or liquefied compressed gas.]
MW: 28.0
BP: -313°F
MLT: -337°F
Sol: 2%
VP: >35 atm
IP: 14.01 eV
RGasD: 0.97

Fl.P: NA (Gas)
UEL: 74%
LEL: 12.5%

Flammable Gas
Incompatibilities & Reactivities
Strong oxidizers, bromine trifluoride, chlorine trifluoride, lithium
Measurement Methods
NIOSH 6604; OSHA ID209
Personal Protection & Sanitation
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite
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
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
See also: INTRODUCTION