FIELD: glass melting. SUBSTANCE: glass for glass-crystal material applicable as structural material in instrumentation engineering, chemical industry, radio engineering, etc. is composed of (in wt %): silica, 55-63; alumina, 8-20; lithium oxide, 3-13; and calcium fluoride, 14-24. Glass-ceramic materials are characterized with coefficient of thermal expansion from ± 10 to +15•10-7 dcg-1. EFFECT: improved consumers' quality. 1 tbl
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