Crystalline silica, tridymite
Crystalline silicon dioxide, tridymite
SiO2
Molecular mass: 60.1
ICSC # 0807
CAS # 15468-32-3
RTECS # VV7335000
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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.
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In case of fire in the surroundings: all extinguishing agents allowed.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Cough.
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Local exhaust or breathing protection.
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•Skin
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•Eyes
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Safety goggles,
or eye protection in combination with breathing protection.
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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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Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting.
Wash away remainder with plenty of water.
(Extra personal protection: P3 filter respirator for toxic particles).
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Important Data
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Physical State; Appearance:
COLOURLESS OR WHITE CRYSTALS
Physical Dangers:
Chemical Dangers:
Reacts with strong oxidants
causing fire and explosion hazard.
Occupational Exposure Limits:
TLV: 0.05 mg/m3 (respirable dust) (ACGIH 1997).
MAK:
Carcinogen category: I
(DFG 2005).
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation.
Inhalation Risk:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.
Effects of Short-Term Exposure:
Effects of Long-Term or Repeated Exposure:
The substance may have effects on the lungs
, resulting in fibrosis (silicosis).
This substance is possibly carcinogenic to humans.
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Physical
Properties
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Boiling point: 2230°C
Melting point: 1703°C
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Relative density (water = 1): 2.3
Solubility in water: none
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Environmental
Data
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N O T E S
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Depending on the degree of exposure, periodic medical examination is indicated.
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ADDITIONAL INFORMATION
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ICSC: 0807
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TRIDYMITE
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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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