GLASS Russian patent published in 1995 - IPC

FIELD: glass industry. SUBSTANCE: glass has, wt.-% two oxides from the group ZnO, SrO, BaO: zinc oxide (ZnO) 0.2-3.0; strontium oxide (SrO) 0.1-2.0; barium oxide (BaO) 0.3-6.0; silicon oxide (SiO₂) 54-59; aluminium oxide (Al₂O₃) 12-19; boron oxide (B₂O₃) 3.5-6.3; magnesium oxide (MgO) 4.5-7.0; calcium oxide (CaO) 7-11; cerium oxide (CeO₂) 0.3-1.0; tin oxide (SnO₂) 0.1-0.7; lead oxide (PbO) 0.1-5.0. Glass can contain up to 1% fluorine (F) for intensification of glass making. Optical density increment is 0.021-0.084 rel. unit. Glass is used in electronic devices on the active matrix. EFFECT: enhanced quality of glass. 2 cl, 2 tbl