High Temperature Plaster Tooling

摘要

Although plaster (gypsum) loses water at temperatures above 300° F. and converts to plaster of Paris that has reduced structural strength, plaster (gypsum) is used in this invention as a mandrel (form or mold) at temperatures in excess of 300° F., at about 600° F. or higher in the manufacture of composite products or other products, such as metals, requiring exposure at such high temperatures.;According to this invention, a plaster mandrel is effective with controlled exposure to such high temperature. Specified additive(s) to plaster, used according to this invention, greatly expand the utility of plaster containing mandrels in high temperature applications.

主权项

1. The method of making a product from high temperature thermoplastic comprising the steps:
a. Forming the desired mandrel by casting hydrated plaster of Paris into the desired mandrel shape, b. Forming a thermoplastic around such mandrel, c. Solidifying the thermoplastic by cooling. d. Rapidly removing such mandrel from solidified thermoplastic.