GLASS FOR LIGHT FILTER Russian patent published in 1995 - IPC

FIELD: glass industry. SUBSTANCE: glass has, wt.-% phosphorus pentoxide P₂O₅ 62-72; aluminium oxide Al₂O₃ 4,1-9,3; boron oxide B₂O₃ 0,5-6,2; lanthanum oxide La₂O₃ 1- 3; calcium oxide CaO 0.1-3.6; lithium oxide Li₂O 0,5-1,5; potassium oxide K₂O 7,2-12,2; nickel oxide NiO 1-6.4, at least one oxide from the group: antimony oxide Sb₂O₃, arsenic oxide As₂O₃., Glass can contain additionally CuO (0.1-2.7 wt.-%). Glass is used for light filter in colorimeter devices. EFFECT: decreased crystallization capability. 1 tbl, 2 dwg