FIELD: metallurgy; foundry. SUBSTANCE: invention relates to making of plaster-based moulds and cores for small and medium size casting of articles from nonferrous metals to models. Proposed sand contains, mass%: plaster, 30-40; ceramic production waste containing clay, 20-60; quartz sand-the rest. Introduction of ceramic production wastes into mould sand makes it possible to get casting featuring optimum physical, mechanical and processing properties. EFFECT: quality of castings. 2 tbl
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