What plaster is best for casting?

What plaster is best for casting?
USG® No.1 Ceramic Gypsum
The most widely used plaster in pottery studios is USG® No. 1 Ceramic Plaster. This plaster is ideal for grouting molds and other plaster castings that require high water absorption. Pottery #1 requires 70 lbs of water to make 100 lbs of dry plaster.

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