Melting point :−205 °C(lit.)
Boiling point :−191.5 °C(lit.)
Density :d4-195 (liq) 0.814; d (gas) 0.968 (air = 1.000); d40 at 760 mm: 1.250 g/liter
vapor density :0.97 (vs air)
vapor pressure :>760 mmHg at 20 °C
refractive index :1.0003
solubility :At 20 °C and at a pressure of 101 kPa, 2.266 volumes of carbon monoxide dissolve in 100 volumes of water.
form :colorless gas
color :colorless
Odor :Odorless gas
explosive limit :74%
Water Solubility :mL/100mL H2O: 3.3 (0°C), 2.3 (20°C) [MER06]
Merck :13,1823
BRN :3587264
Exposure limits :TLV-TWA 50 ppm (～55 mg/m³) (ACGIH, MSHA, and OSHA); STEL 400 ppm (ACGIH); IDLH 1500 ppm (NIOSH).
InChIKey :UGFAIRIUMAVXCW-UHFFFAOYSA-N
CAS DataBase Reference :630-08-0(CAS DataBase Reference)
EPA Substance Registry System :Carbon monoxide (630-08-0)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403 H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas Liquefied gas Dissolved gas Warning P410+P403 H331 Toxic if inhaled Acute toxicity,inhalation Category 3 Danger P261, P271, P304+P340, P311, P321,P403+P233, P405, P501 H372 Causes damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 1 Danger P260, P264, P270, P314, P501
Precautionary statements:	P202 Do not handle until all safety precautions have been read and understood. P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P308+P313 IF exposed or concerned: Get medical advice/attention. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P410+P403 Protect from sunlight. Store in a well-ventilated place.