| 摘要 |
This invention is directed to the production of spontaneous essentially non-crystalline opal glasses exhibiting a very dense, milky-white appearance and excellent resistance to weathering and attack by alkaline detergents consisting essentially, expressed in weight percent on the oxide basis, of 2-5% K2O, 4-10% Na2O, 4.5-12% RO, wherein RO consists of 0-3% MgO, 0-6% CaO, 0-8% SrO, and 0-11% BaO, 4-9% B2O3, 6-15% Al2O3, 0-5% TiO2, 51-66% SiO2, 1-6% P2O5, and 1-5% F.
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