| 摘要 |
The invention is a soda-lime-silica glass composition which is blue in colour and having improved UV and IR absorption. The spectral properties of the blue glass at a 4.0 mm thickness include: 477-494 dominant wavelength and 6-40 % purity of excitation. The blue glass composition, by weight, comprises a base glass composition of: 68 to 75 % SiO2, 10 to 18 % Na2O, 5 to 15 % CaO, 0 to 10 % MgO, 0 to 5 % Al2O3, and 0 to 5 % K2O, where CaO + MgO is 6 to 15 % and Na2O + K2O is 10 to 20 %; and colorants consisting essentially of: 0.4 to 2.0 % total iron oxide as Fe2O3, 0.15 to 2.00 % manganese oxide as MnO2; 0.005 to 0.025 % cobalt oxide as Co, and 0 to 1.00 % titanium oxide as TiO2. The glass is useful for automotive or architectural applications. It preferably is made by a nitrite-free method which may desirably involve the use of a reducing agent during melting operations.
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