Plaster of Paris
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CAS
26499-65-0
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CaSO4 • 0.5H2O
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RTECS
TP0700000
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Synonyms & Trade Names
Calcium sulfate hemihydrate, Dried calcium sulfate, Gypsum hemihydrate, Hemihydrate gypsum [Note: Plaster of Paris is the hemihydrate form of Calcium Sulfate & Gypsum is the dihydrate form.]
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DOT ID & Guide
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Exposure
Limits
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NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
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OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
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IDLH
N.D.
See: IDLH INDEX
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Conversion
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Physical Description
White or yellowish, finely divided, odorless powder.
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MW: 145.2
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BP: ?
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MLT: 325°F (Loses H2O)
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Sol(77°F): 0.3%
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VP: 0 mmHg (approx)
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IP: NA
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Sp.Gr: 2.5
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Fl.P: NA
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UEL: NA
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LEL: NA
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Noncombustible Solid
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Incompatibilities & Reactivities
Moisture, water [Note: Hygroscopic (i.e., absorbs moisture from the air). Reacts with water to form Gypsum.]
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Measurement Methods
NIOSH 0500, 0600
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
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Respirator Recommendations
Not available.
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, mucous membrane, respiratory system; cough
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Target Organs
Eyes, skin, respiratory system
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See also: INTRODUCTION
See ICSC CARD: 1217 |
