Molding Sand: Constituents, Types and Properties
Facing sand is made of silica sand and clay, without the use of already used sand. Different forms of carbon are used in facing sand to prevent the metal burning into the sand. A facing sand mixture for green sand of cast iron may consist of 25% fresh and specially prepared and 5% sea coal. They are sometimes mixed with 615 times as much fine molding sand to make facings. The layer of facing ...
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