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Table of Contents
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Wax originals as patterns
While this is an economical method, it presents some risks. There is no second chance if the casting fails and no guide for repair if part of the casting fails and needs to be redone. Small solid castings may have shrink holes or other surface defects. Most wax patterns from rubber molds are poured one quarter inch or thinner, eliminating this pitfall.
Other materials can be burned out of the ceramic shell molds such as wood and plastic, but may leave residual ash not always readily removable from the mold. Other materials that shrink or expand drastically do not work well: Such as leather and some plastics.
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