PHOTOCHROME GLASS Russian patent published in 1996 - IPC

FIELD: glass industry. SUBSTANCE: glass has, wt.-%: silicon oxide (SiO₂) 48.45-55.09; boron oxide (B₂O₃) 20.42-26.0; aluminium oxide (Al₂O₃) 0.2-3.0; sodium oxide (Na₂O) 8.0-9.8; potassium oxide (K₂O) 0.5-5.0; copper oxide Cuo 0.62-1.19; clorine (Cl) 0.87-1.67; fluorine (F) 0.49-1.0; antimony oxide (Sb₂O₃) 0.1-1.0; zirconium oxide (ZrO₂) 0.2-5.9; phosphorus pentoxide (P₂O₅) 0.54-1.0; tin oxide (SnO₂) 3-7, and silver oxide (Ag₂O) 0.01-0.05. Properties: glass optical density at impulse termination after 1000 ms - 1.06, after 150 ms - 0.57; sample transmission after 90 s activation on "ИФС" - 3.37%. Glass is used for color filter making exhibiting alternating light transmission for protection against different radiation types. EFFECT: enhanced quality and properties of glass. 3 tbl