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Chemical Information Overview  |  Chemical Product  |  Chemical Raw Material  |  Chemical Company
USG No. 1 Moulding Plaster
Calcium sulfate hemihydrate
Calcium Sulfate Hemihydrate
26499-65-0
Often referred to as ¡°plaster of Paris¡± or soft plaster. Used for waste molds or temporary patterns where surface hardness and strength are not important. Screeds well under a template but is not as hard or strong as HYDROCAL cement. The expansion is greater than with A-11 or B-11 cements.

Appearance and Odor: Off white to gray powder: low odor.
Meltng Point: 1450'C - decomposes
Solubility In Water: 0.15%
Specific Gravity (H2O=1): 2.3 - 2.6
pH: 7.5 - 8.5
Hardening Time: Varies. Check usage and/or product specification data for each product.
Industrial field others
United States Gypsum Co
Phone 888.874.2450
Fax 888.874.2348
Homepage www.usg.com
E-mail samplit@usg.com
Address 125 South Franklin Chicago, IL 60606-4678
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