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Chemical Sampling Information (CSI)
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General Description

Synonyms: Cristobalite prior to 9/1/89

OSHA IMIS Code Number: 9015

Chemical Abstracts Service (CAS) Registry Number: 14464-46-1

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: VV7330000

NIOSH Pocket Guide to Chemical Hazards, Silica, Crystalline Cristobalite, Respirable Dust: chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:
solid
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): Group 2A, probably carcinogenic to humans (Crystalline + Silica) [15 MB PDF, 202 pages]
Health Effects: Pneumoconiosis (HE10)
Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • sampling media: Tared Low Ash Polyvinyl Chloride (LAPVC) filter 5 microns preceded by 10 mm Nylon Cyclone
    maximum volume: 816 Liters
    maximum flow rate: 1.7 L/min
    current analytical method: X-ray Diffraction; XRD
    method reference: 2 (OSHA ID-142)
    method classification: Partially Validated
    note: Collect a sample of the bulk substance and send to the lab in a separate mailing container at the time the air samples are submitted. Indicate on the sample sheet that a bulk sample has been submitted. For SiO2, a high volume area or settled dust sample is preferred. Any sample weight between 0.10 mg and 5.0 mg is acceptable (0.5 to 3.0 mg is preferred). If they are present in the work environment, the following major interferences should be noted: aluminum phosphate, feldspars (microcline orthoclase, plagioclase), graphite, iron carbide, lead sulphate, micas (biotite, muscovite), montmorillonite, potash, sillimanite, silver chloride, talc and zircon (zirconium silicate). Quartz and cristobalite may be submitted on the same filter; otherwise, submit as a separate filter.
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Page last updated: 01/13/1999

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