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Unformatted text preview: commonly employed in making medium-heavy and heavy castings. Generally, the surface of the mold is washed or sprayed with a refractory mold coating. The most common method of drying the refractory mold coating uses hot air, gas or oil flame. Skin drying of the mold can be accomplished with the aid of torches, a bank of radiant heating lamps or electrical heating elements directed at the mold surface....
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- Spring '10