| 摘要 |
A NOVEL SOLAR RADIATION STABLE ALUMINOSILICATE GLASS HAS THE COMPOSITION (BY WT., ON OXIDE BASIS) 45- 68% SIO2, >5-18% AL2O3, 0-5% NA2O, >9-15% K2O, 0-10% CAO, 0.5-<17% SRO, 0-10% BAO, 1-6% ZRO2, 0.2-5% TIO2 AND OPTIONALLY USUAL AMOUNTS OF REFINERS, THE SUM OF NA2O+K2O BEING 10%, THE SUM OF CAO+SRO+BAO BEING 8-<17% AND PREFERABLY THE NA2O/K2O WT. RATIO BEING <0.4. ALSO CLAIMED IS A SIMILAR ALUMINOSILICATE GLASS WHICH IS SUITABLE FOR THE FLOAT PROCESS AND WHICH ONLY CONTAINS UP TO IMPURITY LEVEL QUANTITIES OF PBO, AS2O3, SB2O3, ZNO, MGO AND B2O3.
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