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| Plaster of Paris | CAS 26499-65-0 | ||
| CaSO4 • 0.5H2O | 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.] |
DOT ID & Guide |
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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) | |||
| IDLH N.D. See: IDLH INDEX | Conversion | ||
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Physical Description White or yellowish, finely divided, odorless powder. |
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MW: 145.2 |
BP: ? |
MLT: 325°F (Loses H2O) |
Sol(77°F): 0.3% |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr: 2.5 |
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Fl.P: NA |
UEL: NA |
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 Method Filter; none; Gravimetric; IV [Particulates NOR: #0500 (total), #0600 (respirable)] See: NMAM INDEX |
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Personal Protection & Sanitation Skin: N.R. Eyes: N.R. Wash skin: N.R. Remove: N.R. Change: N.R. |
First Aid (See procedures) Eye: Irrigate immediately Breathing: Respiratory support Swallow: Medical attention immediately |
| Respirator Recommendations To be added later | |
| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| 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 |