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Calcium sulfate (Total Dust)

General Description

  • Synonyms: Sulfuric Acid, Calcium Salt (1:1); Crysalba; Drierite; Gibs; Thiolite
  • OSHA IMIS Code Number: C104
  • Chemical Abstracts Service (CAS) Registry Number: 7778-18-9
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: WS6920000; 79856
  • Chemical Description and Physical Properties:
    • white odorless powder or crystals, slightly soluble in water
    • molecular weight: 138.16
    • molecular formula: Ca.H2OS
    • melting point: 1450°C

Exposure Limits

  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 mg/m3 TWA; The value is for particulate matter containing no asbestos and <1% crystalline silica.
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

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