Abstract
A new method for the regeneration of gypsum from used molds has been evolved at the request of, and in collaboration with, the Gustavsberg Porcelain Works, Ltd. The reasons why regenerated plaster of Paris has previously been inferior to plaster made from rock gypsum have been elucidated. The method of regeneration, for which an application for a patent has been made (Swedish patent No. 119024, Regeneration of Plaster of Paris), has been tested on an industrial scale. These experiments show that molds made from “regenerated” plaster of Paris could be used just as long as good quality plaster was used. In certain cases they could be used even longer.
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