OPTIC GLASS Russian patent published in 1997 - IPC

FIELD: electronic techniques. SUBSTANCE: proposed glass comprises 20-40 mass % of silicium oxide having essential formula SiO₂, 25-40 mass % of boron oxide having essential formula B₂O₃, 13-22 mass % of aluminium oxide having essential formula Al₂O₃, 1-4 mass % of magnesium oxide having essential formula MgO, 7-15 mass % of calcium oxide having essential formula CaO and 1-6 mass % of oxide being chosen of titanium oxide having essential formula TiO₂,, zirconium oxide having essential formula ZrO₂, tin oxide having essential formula SnO₂ and hafnium oxide having essential formula HbO₂. EFFECT: improved quality of desired product. 1 tbl