Zinc-containing phosphate glasses

摘要: This invention is directed to the preparation of glasses exhibiting a transition temperature below 450° C., working 500° and excellent resistance attack by water mild aqueous alkaline solutions. The consist essentially, in mole percent, at least 65% total 23-55% ZnO, 28-40% P2 O5, 10-35% R2 O, wherein O consists two alkali metal oxides indicated proportions selected from group consisting 0-25% Li2 Na2 K2 up 35% optional ingredients 0-6% Al2 O3, 0-8% B2 O3 +B2 0-15% Cu2 0-5% F, 0-35% PbO, SnO, PbO+SnO, ZrO2, 0-4% SiO2, MgO+CaO+SrO+BaO+MnO, 0-10% MgO, CaO, SrO, 0-12% BaO, 0- 10% MnO.