Plaster of Paris |
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.] |
CAS No. 26499-65-0 |
RTECS No. TP0700000 |
DOT ID & Guide |
FormulaCaSO4 • 0.5H2O |
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 White or yellowish, finely divided, odorless powder. |
MW: 145.2 |
BP: ? |
MLT: 325°F (Loses H2O) |
Sol(77°F): 0.3% |
VP: 0 mmHg (approx) |
IP: NA |
Sp.Gr: 2.5 |
Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Solid |
Incompatibilities & Reactivities Moisture, water [Note: Hygroscopic (i.e., absorbs moisture from the air). Reacts with water to form Gypsum.] |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
Symptoms irritation eyes, skin, mucous membrane, respiratory system; cough |
Target Organs Eyes, skin, respiratory system |
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Personal Protection/Sanitation (See protection codes)
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 |
Respirator Recommendations Not available.
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 1217
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