Monosilane
Silicon tetrahydride
Silicane
SiH4
Molecular mass: 32.1
(cylinder)
ICSC # 0564
CAS # 7803-62-5
RTECS # VV1400000
UN # 2203
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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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Extremely flammable.
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NO open flames, NO sparks, and NO smoking.
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Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with
powder, carbon dioxide.
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Explosion
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Gas/air mixtures are explosive.
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Closed system, ventilation, explosion-proof electrical equipment and lighting.
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Combat fire from a sheltered position.
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Exposure
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STRICT HYGIENE!
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•Inhalation
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Cough.
Headache.
Nausea.
Sore throat.
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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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Redness.
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.
Rinse skin with plenty of water or shower.
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•Eyes
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Redness.
Pain.
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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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Spillage Disposal
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Storage
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Packaging & Labelling
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Evacuate danger area!
Consult an expert!
Ventilation.
Remove gas with fine water spray.
(Extra personal protection: self-contained breathing apparatus).
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Fireproof.
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UN Hazard Class: 2.1
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Important Data
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Physical State; Appearance:
COLOURLESS GAS
, WITH CHARACTERISTIC ODOUR.
Physical Dangers:
The gas is heavier than air.
Chemical Dangers:
The substance may spontaneously ignite on contact with air.
The substance decomposes
on heating or
on burning
producing silicon and hydrogen
, causing fire and explosion hazard.
The substance is a strong reducing agent and reacts with oxidants.
Reacts slowly with water.
Reacts with potassium hydroxide solution and halogens.
Occupational Exposure Limits:
TLV (as TWA): 5 ppm; 6.6 mg/m3 (ACGIH 1996).
MAK not established.
OSHA PEL: none
NIOSH REL: TWA 5 ppm (7 mg/m3)
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 substance
irritates the eyes, the skin and the respiratory tract.
Rapid evaporation of the liquid may cause frostbite.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Boiling point: -112°C
Melting point: -185°C
Solubility in water: slow reaction
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Relative vapour density (air = 1): 1.3
Explosive limits, vol% in air: 1.37-100
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Environmental
Data
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N O T E S
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ADDITIONAL INFORMATION
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ICSC: 0564
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SILANE
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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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