FIELD: ceramic industry, more particularly manufacture of heat resistant porcelain and laboratory equipment. SUBSTANCE: in first embodiment, composition comprises wt %: fired refractory material, 47.0-53.0; permatite, 17.0-24.0; clay, 23.0-27.0; kaolin, 3.0-6.0; liquid glass, 0.1-0.2; calcined soda, 0.1-0.2. In second embodiment, composition further comprises alumina, ratios of components being as following, wt %: fired refractory material, 43-47; permatite, 15-21; clay, 21-24, kaolin, 3-6; alumina, 9-11; liquid glass, 0.1-0.2; Said compositions make it possible to prepare products having strength and higher heat resistance. EFFECT: improved properties of the composition. 5 cl, 3 tbl _
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