No. 1 Moulding Plaster

Ornamental plaster used for creating decorative trim or running cornices.

Overview

An ornamental plaster used for creating decorative trim or running cornices. Designed for use where expansion control, hardness and strength are not primary considerations.

Main Features

Often referred to as Plaster of Paris or soft plaster, No. 1 Moulding Plaster is used to create waste molds or temporary patterns where surface hardness and strength are not crucial.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- and 100-pound bags

Documents & Files

Submittal Sheets & Specifications

Catalogs & Brochures

Installation & Technical Manuals

SDS, Certifications & Reports

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q & a

  • How do I mix plaster?

    You will need a bucket, scale and mixing equipment. Mixing could be accomplished through basic hand mixing with a large spoon, but mechanical mixing is preferred. An electric drill with a cage mixer head attached is good for small batches. The first step involves measuring and adding enough water to the bucket to achieve the desired consistency. You then need to weigh out enough gypsum plaster to meet the proper ratio for the selected water volume. Sift the plaster into the bucket of water and allow the plaster to soak for 1 to 2 minutes. Follow this immediately with mixing, generally for 1 to 2 minutes based on product. NOTE: If mixing by hand, use vigorous stirring action. After mixing and pouring the gypsum slurry, make sure to clean all tools and the mixing vessel before the plaster hardens. For more detail on mixing, see USG publication IG503, Plaster Mixing Procedures.

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