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        The National Institute for Occupational Safety and Health (NIOSH)
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          The National Institute for Occupational Safety and Health (NIOSH)
         1. NIOSH Pocket Guide to Chemical Hazards
      Calcium sulfate
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        Calcium sulfate
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                Synonyms & Trade Names
                  Anhydrous calcium sulfate, Anhydrous gypsum, Anhydrous sulfate of lime, Calcium salt of sulfuric acid [Note: Gypsum is the dihydrate form and Plaster of Paris is the hemihydrate form.]
                CAS No.
                  7778-18-9
                RTECS No.
                  WS6920000
                DOT ID & Guide
                Formula
                  CaSO₄
                Conversion
                IDLH
                  N.D.
                  See: IDLH INDEX
                Exposure Limits
                  NIOSH REL
                  TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
                  OSHA PEL
                  TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
                Measurement Methods
                  NIOSH 0500 , 0600
                  See: NMAM or OSHA Methods
                Physical Description
                  Odorless, white powder or colorless, crystalline solid. [Note: May have blue, gray, or reddish tinge.]
                Molecular Weight
                  136.1
                Boiling Point
                  Decomposes
                Melting Point
                  2840°F (Decomposes)
                Solubility
                  0.3%
                Vapor Pressure
                  0 mmHg (approx)
                Ionization Potential
                  NA
                Specific Gravity
                  2.96
                Flash Point
                  NA
                Upper Explosive Limit
                  NA
                Lower Explosive Limit
                  NA
                  Noncombustible Solid
                Incompatibilities & Reactivities
                  Diazomethane, aluminum, phosphorus, water [Note: Hygroscopic (i.e., absorbs moisture from the air). Reacts with water to form Gypsum & Plaster of Paris.]
                Exposure Routes
                  inhalation, skin and/or eye contact
                Symptoms
                  irritation eyes, skin, upper respiratory system; conjunctivitis; rhinitis, epistaxis (nosebleed)
                Target Organs
                  Eyes, skin, respiratory system
                Personal Protection/Sanitation
                (See protection codes)
                Skin:No recommendation
                Eyes:No recommendation
                Wash skin:No recommendation
                Remove:No recommendation
                Change:No recommendation
                First Aid
                (See procedures)
                Eye:Irrigate immediately
                Skin:Soap wash
                Breathing:Fresh air
                Respirator Recommendations
                Not available.
                Important additional information about respirator selection
                See also
                INTRODUCTION ICSC CARD: 1589
      Page last reviewed: October 30, 2019
        Content source: National Institute for Occupational Safety and Health
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          + C – Supplementary Exposure Limits
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          + G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
          + Type C & CE – Definitions for Type C and Type CE Respirators
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