Hydrazine / N₂H₄


Gas Identification

Other denomination
Diazane Diamine
CAS Registry Number
SCBA type

Chemical properties

Molecular formula
Molecular mass
32 g/mol

Physical properties

Boiling point
114 °C
Autoignition temperature
> 270 °C
Gas/Vapour density
8,93 eV

Flammability limit

1,8 % v/v
100 % v/v

Threshold limit value

0,01 ppm • 0,013 mg/m³ (depuis 17 janvier 2020)

Hydrazine : Description and use


Hydrazine, official name diazane, is a colourless liquid chemical compound, with an odour similar to that of ammonia. It is miscible with water in all proportions.
It is a fuming, colourless, hygroscopic liquid with an acrid odour.

  • Intermediate in organic synthesis (agrochemicals, pharmaceutical industry, chemical industry, etc.).
  • Laboratory reagent.
  • Blowing agent for polymer foams (PE, PVC, EVA, rubber, etc.).
  • Reducing agent for metal salts.
  • Corrosion inhibitor in the water of industrial boilers, and nuclear and thermal power stations.
  • Fuel for rockets or fuel cells.

Hydrazine : Warnings and caution

GHS hazard statements

H226 - Flammable liquid and vapour.
H350 - May cause cancer.
H331 - Toxic if inhaled.
H311 - Toxic in contact with skin.
H301 - Toxic if swallowed.
H314 - Causes severe skin burns and eye damage.
H317 - May cause an allergic skin reaction.
H410 - Very toxic to aquatic life with long-lasting effects.

GHS precautionary statements

P201 - Obtain special instructions before use.
P202 - Do not handle until all safety precautions have been read and understood.
P260 - Do not breathe dust/fumes/gas/mist/vapours/spray.
P264 - Wash ... thoroughly after handling.
P270 - Do not eat, drink or smoke when using this product.
P271 - Use only outdoors or in a well-ventilated area.
P272 - Contaminated work clothing should not be allowed out of the workplace.
P273 - Avoid release to the environment.
P280 - Wear protective gloves/protective clothing/eye protection/face protection.
P281 - Use personal protective equipment as required.

SGH02 : Inflammable
SGH06 : Toxique
SGH05 : Corrosif
SGH08 : Sensibilisant, mutagène, cancérogène, reprotoxique
SGH09 : Danger pour le milieu aquatique