Dinitrogen monoxide
Hyponitrous acid anhydride
Laughing gas
Dinitrogen oxide
N2O
Molecular mass: 44.0
(cylinder)
ICSC # 0067
CAS # 10024-97-2
RTECS # QX1350000
UN # 1070 (compressed)
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible but enhances combustion of other substances.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO open flames, NO sparks, and NO smoking.
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In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Risk of fire and explosion: see Chemical Dangers.
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Closed system, ventilation, explosion-proof electrical equipment and lighting.
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In case of fire: keep cylinder cool by spraying with water.
Combat fire from a sheltered position.
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Exposure
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AVOID Exposure OF (PREGNANT) WOMEN!
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•Inhalation
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Euphoria.
Drowsiness.
Unconsciousness.
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Ventilation.
Local exhaust or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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ON CONTACT WITH LIQUID: FROSTBITE.
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Cold-insulating gloves.
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ON FROSTBITE: rinse with plenty of water, do NOT remove clothes.
Refer for medical attention.
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•Eyes
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ON CONTACT WITH LIQUID: FROSTBITE.
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Safety goggles
or
eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Do not eat, drink, or smoke during work.
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Spillage Disposal
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Storage
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Packaging & Labelling
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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.
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Fireproof if in building.
Separated from
incompatible materials
.
See Chemical Dangers.
Cool.
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UN Hazard Class: 2.2
UN Subsidiary Risks: 5.1
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Important Data
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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: C;
(DFG 2006).
OSHA PEL: none
NIOSH REL*: TWA 25 ppm (46 mg/m3) (TWA over the time exposed) *Note: REL for exposure to waste anesthetic gas.
NIOSH IDLH: N.D. See: IDLH INDEX
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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.
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Physical
Properties
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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
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Vapour pressure, kPa at 20°C: 5150
Relative vapour density (air = 1): 1.53
Octanol/water partition coefficient as log Pow: 0.35
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Environmental
Data
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N O T E S
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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 October 2006: see section Occupational Exposure Limits.
Transport Emergency Card: TEC (R)-20S1070
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ADDITIONAL INFORMATION
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ICSC: 0067
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NITROUS OXIDE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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