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Synonyms: Tridymite prior to 9/1/89
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)
International Agency for Research on Cancer (IARC): Silica - Group 2A, probably carcinogenic to humans (Crystalline + Silica)
Primary Laboratory Sampling/Analytical Method (SLC1):
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