MOLDING MATERIAL Russian patent published in 2005 - IPC

FIELD: foundry, possibly manufacture of green sand-clay molding composition with carbon-containing materials.

SUBSTANCE: molding material contains, mass %: milled coal, the base; bitumen, 5 - 30; wood-tar pitch, 5 - 30; technical carbon, 2 - 5; bentonite, 5 - 15; one of products of processing starch-containing compounds such as dextrin, 5 - 10. Total content of bitumen and wood - tar pitch is in range 15 - 35.

EFFECT: lowered roughness of casting surface, elimination of burning, of pin holes, enhanced capability of molding sand to knocking out.

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