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NIOSH

TRIDYMITE

ICSC: 0807

Crystalline silica, tridymite
Crystalline silicon dioxide, tridymite
SiO2
Molecular mass: 60.1
ICSC # 0807 		CAS # 15468-32-3
RTECS # VV7335000
September 10, 1997 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Not combustible.

In case of fire in the surroundings: all extinguishing agents allowed.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST!

•INHALATION Cough.
Local exhaust or breathing protection.

•SKIN


•EYES
Safety goggles, or eye protection in combination with breathing protection.

•INGESTION


SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

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).


ICSC: 0807 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

TRIDYMITE

ICSC: 0807

I

M

P

O

R

T

A

N

T


D

A

T

A

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).


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.

PHYSICAL
PROPERTIES

Boiling point: 2230°C
Melting point: 1703°C
Relative density (water = 1): 2.3
Solubility in water: none

ENVIRONMENTAL
DATA


N O T E S

Depending on the degree of exposure, periodic medical examination is indicated.

ADDITIONAL INFORMATION



ICSC: 0807 TRIDYMITE
(C) IPCS, CEC, 1994
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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