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NITROUS OXIDE ICSC: 0067
Date of Peer Review: May 2003

Dinitrogen monoxide
Hyponitrous acid anhydride
Laughing gas
Dinitrogen oxide
(cylinder)
CAS # 10024-97-2 N2O
RTECS # QX1350000 Molecular mass: 44.0
UN # 1070 (compressed)
EC #
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible but enhances combustion of other substances. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames, NO sparks, and NO smoking.
In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION Risk of fire and explosion: see Chemical Dangers.
Closed system, ventilation, explosion-proof electrical equipment and lighting.
In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.
EXPOSURE
AVOID EXPOSURE OF (PREGNANT) WOMEN!

Inhalation Euphoria. Drowsiness. Unconsciousness.
Ventilation. Local exhaust or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin ON CONTACT WITH LIQUID: FROSTBITE.
Cold-insulating gloves.
ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.
Eyes ON CONTACT WITH LIQUID: FROSTBITE.
Safety goggles or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion
Do not eat, drink, or smoke during work.

SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. If in liquid state: do NOT absorb in saw-dust or other combustible absorbents. NEVER direct water jet on liquid. Personal protection: self-contained breathing apparatus.
EU Classification
UN Classification
UN Hazard Class: 2.2
UN Subsidiary Risks: 5.1

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20S1070
Fireproof if in building. Separated from incompatible materials. See Chemical Dangers. Cool.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 1999

SEE IMPORTANT INFORMATION ON BACK
NITROUS OXIDE ICSC: 0067
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS COMPRESSED LIQUEFIED GAS, WITH CHARACTERISTIC ODOUR.

PHYSICAL DANGERS:
The gas is heavier than air and may accumulate in low ceiling spaces causing deficiency of oxygen.

CHEMICAL DANGERS:
Reacts violently with sulphurous anhydride, amorphous boron, phosphine, ethers, aluminium, hydrazine, phenyl-lithium and tungsten carbide causing fire and explosion hazard. The gas is a strong oxidant above 300C and may form explosive mixtures with ammonia, carbon monoxide, hydrogen sulfide, oil, grease and fuels.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 50 ppm as TWA; A4 (not classifiable as a human carcinogen); (ACGIH 2004).
MAK: 100 ppm, 180 mg/m; Peak limitation category: II(2); Pregnancy risk group: D; (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE:
The liquid may cause frostbite. The substance may cause effects on the central nervous system, resulting in lowering of consciousness.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the bone marrow and peripheral nervous system. May cause reproductive toxicity in humans.
PHYSICAL PROPERTIES
Boiling point: -88.5C
Melting point: -90.8C
Relative density (water = 1): 1.23 at -89C
Solubility in water, g/100 ml at 15C: 0.15
Vapour pressure, kPa at 20C: 5150
Relative vapour density (air = 1): 1.53
Octanol/water partition coefficient as log Pow: 0.35
ENVIRONMENTAL DATA

NOTES
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Other UN number: 2201 Nitrous oxide, refrigerated liquid.
Card has been partly updated in April 2005. See section Occupational Exposure Limits.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 1999
See Also:
        Nitrous oxide (CHEMINFO)