ICSC 0067 - NITROUS OXIDE

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NITROUS OXIDE

ICSC: 0067
_{May 2003}

Dinitrogen monoxide
Hyponitrous acid anhydride
Laughing gas
Dinitrogen oxide

CAS No: 10024-97-2
RTECS No: QX1350000
UN No: 1070 (compressed)

(cylinder)
N₂O
Molecular mass: 44.0

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.	UN Hazard Class: 2.2 UN Subsidiary Risks: 5.1

EMERGENCY RESPONSE	SAFE STORAGE
Transport Emergency Card: TEC (R)-20S1070	Fireproof if in building. Separated from incompatible materials. See Chemical Dangers. Cool.

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 300°C 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/m³; 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	ENVIRONMENTAL DATA
Boiling point: -88.5°C Melting point: -90.8°C Relative density (water = 1): 1.23 at -89°C Solubility in water, g/100 ml at 15°C: 0.15 Vapour pressure, kPa at 20°C: 5150 Relative vapour density (air = 1): 1.53 Octanol/water partition coefficient as log Pow: 0.35

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.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004

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Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.

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