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Chemical Sampling Information (CSI)
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General Description

Synonyms: Tridymite prior to 9/1/89

OSHA IMIS Code Number: 9017

Chemical Abstracts Service (CAS) Registry Number: 15468-32-3

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: see 1910.1000 Table Z-3

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.05 mg/m3 TWA; (Respirable fraction)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.05 mg/m3 TWA; Potential carcinogen

Health Factors

Carcinogenic Classification:

International Agency for Research on Cancer (IARC): Silica - Group 2A, probably carcinogenic to humans (Crystalline + Silica)
Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

See Silica, Crystalline Quartz, Respirable dust (IMIS 9010)

  • note: Recognized reference material not available, analysis not performed at the Salt Lake Technical Center. Occurrence of Tridymite extremely rare. Submit respirable sample to the Salt Lake Technical Center for quartz &/or cristobalite analysis.

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