Nitric monoxide / NO 

Nitric monoxide

Gas Identification

Other denomination
Nitric oxide
CAS Registry Number
SCBA type

Chemical properties

Molecular formula
Molecular mass
30 g/mol

Physical properties

Boiling point
-151,8 °C
Autoignition temperature
Gas/Vapour density
9,26 eV

Flammability limit


Threshold limit value

2 ppm • 2,5 mg/m³

Nitric monoxide : Description and use


Nitric monoxide or nitric oxide is a gas under normal temperature and pressure conditions. It is a significant neurotransmitter in mammals. Dissolved, it easily penetrates biological membranes and passes from one cell to another, making it an "ideal paracrine signaller".
Nitric monoxide (NO) must not be confused with other nitric oxides, such as nitrous oxide (N₂O), which is also called "laughing gas" and is a general anaesthetic, or even nitrogen dioxide (NO₂), an extremely irritating and noxious reddish-brown gas, which is formed due to the rapid oxidisation of NO by the oxygen in the air.

Flammability: The product is not flammable.


Nitric monoxide and dinitrogen tetroxide are mainly used to create calibration mixtures in order to control air pollution and combustion gases.

Nitric monoxide : Warnings and caution

GHS hazard statements

H270 - May cause or intensify fire; oxidiser
H280 - Contains gas under pressure; may explode if heated.
H330 - Fatal if inhaled.
H314 - Causes severe skin burns and eye damage.
H318 - Causes serious eye damage.

GHS precautionary statements

P220 - Keep/Store away from combustible materials.
P244 - Keep reduction valves free from grease and oil.
P260 - Do not breathe gas/vapours.
P280 - Wear protective gloves/protective clothing/eye protection/face protection.

SGH04 : Gaz sous pression
SGH06 : Toxique
SGH05 : Corrosif
SGH03 : Comburant