#1 POTTERY PLASTER is highly uniform, noted for outstanding performance and long life. The standard of the industry - this is the best material available for sanitaryware and dinnerware casting. Used for making plaster bats, wedging boards, and working molds. The U.S. Gypsum Pottery Plaster is a relatively soft plaster which may be used for carving. - Individually packaged into smaller, easy to handle vacuum sealed bags to maintain freshness and ease of use.