Quick Overview

• Often referred to as plaster of Paris or soft plaster, USG® No. 1 Moulding Plaster is used to create waste molds or temporary patterns where surface hardness and strength are not crucial.


• The plaster offers a controlled set that provides uniform workability, and its fine grain makes it ideal for producing sharp detail when used neat for cast work.


• The cement requires 70 parts water by weight per 100 parts plaster, and after mixing, it sets in 27-37 minutes. It complies with ASTM C28. USG No. 1 Moulding Plaster is available in 50- and 100-pound bags.