Silicon tetrafluoride
Silicon fluoride
Perfluorosilane
SiF4
Molecular mass: 104.1
(cylinder)
ICSC # 0576
CAS # 7783-61-1
RTECS # VW2327000
UN # 1859
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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.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO water.
In case of fire in the surroundings:
powder, carbon dioxide
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Explosion
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In case of fire: cool cylinder by spraying with water but avoid contact of the substance with water.
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Exposure
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AVOID ALL CONTACT!
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•Inhalation
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Sore throat.
Cough.
Burning sensation.
Shortness of breath.
Laboured breathing.
Symptoms may be delayed (see Notes).
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Half-upright position.
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.
Protective clothing.
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Rinse skin with plenty of water or shower.
Refer for medical attention.
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•Eyes
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Redness.
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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.
Personal protection:
chemical protection suit including self-contained breathing apparatus.
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Fireproof.
Keep in a well-ventilated room.
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Do not transport with food and feedstuffs.
UN Hazard Class: 2.3
UN Subsidiary Risks: 8
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Important Data
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Physical State; Appearance:
COLOURLESS
GAS
, WITH PUNGENT ODOUR.
Physical Dangers:
The gas is heavier than air.
Chemical Dangers:
The substance decomposes
on heating
producing toxic and corrosive fumesincludinghydrogen fluoride (see ICSC 0283).
Reacts with water to form hydrogen fluoride and silicic acid.
Attacks many metals in presence of water releasing hydrogen.
Occupational Exposure Limits:
TLV: (fluorides, as F) 2.5 mg/m3 as TWA; A4 (not classifiable as a human carcinogen); BEI issued (ACGIH 2005).
MAK: (Inhalable fraction) 1 mg/m3
Peak limitation category: II(4);
skin absorption (H);
Pregnancy risk group: C;
(DFG 2005).
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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
is corrosive to
the eyes,
the skin
and
the respiratory tract.
Inhalation of this gas may cause lung oedema (see Notes).
The effects may be delayed.
Medical observation is indicated.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Sublimation point: -95.7°C
Solubility in water:
reaction
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Relative vapour density (air = 1): 3.6
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Environmental
Data
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N O T E S
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The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation is therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
Card has been partly updated in October 2005. See sections Occupational Exposure Limits, Emergency Response.
Transport Emergency Card: TEC (R)-20G1TC
NFPA Code: H3; F0; R2; W
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ADDITIONAL INFORMATION
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ICSC: 0576
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TETRAFLUOROSILANE
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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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