E2660-CO-NO
Rev 29.06.2021
Nitric oxide
A colorless toxic gas, relatively insoluble in water. When exposed to oxygen (including air),
nitric oxide is converted into nitrogen dioxide.
Chemical formula
NO
Molar weight
30
Relative gas density (to air)
1.03
Conversion
1 ppm = 1.23 mg/m
3
Boiling point
-152 °C
Flammability
Nonflammable, but accelerates the burning of
combustible materials.
Odor
Pure NO is odorless, but in the air, it oxidizes to NO
2
which has a pungent odor
Hazards
Irritates respiratory tract and eyes, at high concentrations
may cause lung edema and death.
Exposure
limits
(Directive
91/322/EEC)
TWA
30 mg/m
3
/25 ppm
IDLH (NIOSH)
123 mg/m
3
/100 ppm
Conversion of ppm to mg/m
3
is calculated for 25°C and 1 atm.
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