USG: No. 1 Moulding Plaster

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. USG No. 1 Moulding Plaster:

  • Offers a controlled set that provides uniform workability

  • Has a fine grain — making it ideal for producing sharp detail when used neat for cast work

  • Complies with ASTM C28

  • Sets in 27-37 minutes after mixing

  • Requires 70 parts water by weight per 100 parts plaster

  • Is available in 50 lb. bags

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