GLASS Russian patent published in 1994 - IPC

FIELD: high-temperature insulation. SUBSTANCE: glass has the following components, wt.-%: lead oxide 54-62; boron oxide 8-12; silicon oxide 15- 22; aluminium oxide 2-3; manganese oxide 2-3; cobalt oxide 0.25-0.47; zinc oxide 2.9-5; copper oxide 0.5-1; nickel oxide 0.5-1; tungsten oxide 2-3.3, and boron oxide 0.03-0.05. Glass properties: making point is about 1250 C, melting point is about 680-700 C. EFFECT: enhanced quality of glass. 1 tbl