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Plaster, Pottery #1 - 100 lb. bag
Plaster,  Pottery #1 - 100 lb. bag
There are many different types of plaster and they vary mainly in setting time, strenth, absorbency. Manufacturers provide instruction booklets on how to mix and use their materials. For example, common precautions with reference to pottery plaster are: Don't stack pallets 3 high to avoid hard chunks, use before the shelf life of 120 days expires (if longer then extend mixing time), don't mix at higher than 105 degrees for proper set. USG Pottery #1 (2000 psi) is an example of an all around material. It is normally mixed at a 70 consistency (70 water to 100 plaster). Jiggering benefits from a plaster with more surface hardening additives (i.e. USG's "Puritan"). For carving USG "Moulding Plaster" works well. USG Ultracal (5000 psi) and Hyrdostone (10,000 psi) are very hard materials and ideal for case molds where hardness and the expense of absorbency are required (they require much less water). The optimum hardness and absorbency of the final product are best achieved with the proper water to plaster ratio. Manufacturers recommend that you weigh the water, add the plaster to the water, soak for 2-3 minutes, then mix well using a propeller mixer. It is important not to mix in air bubbles, but to agitate in such a way that the air bubbles break at the surface during mixing.
 
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