| 摘要 |
Blue-colored silico-soda-lime glass composition includes coloring agents in the following amounts: Fe2O3 (total iron) 0.2-0.51%; CoO 10-50 ppm; Cr2O3 10-300 ppm, and CuO 0-400 ppm. The glass has a redox factor of at most 0.35, a dominant wavelength of 485-489 nm, an excitation purity less than 13%, and a selectivity of at least 1.1 at a thickness of 3-5 mm Preferred Features: The amounts of coloring agents are as follows: iron content, above 0.3%, preferably 0.40%, and most preferably 0.45%; CoO content 15-40 ppm, preferably 20-35 ppm; Cr2O3 at least 20 ppm, and preferably at most 250 ppm; and CuO less than 250 ppm. Selectivity is at least 1.3, preferably at least 1.4. The glass has a light transmission TLA of at least 60%, and preferably at least 70%. The amounts of Cr2O3 and CoO satisfy the relationship: 100 /* Cr2O3/(CoO)<2> /> 7. The redox factor is above 0.20, and preferably less than 0.30. The excitation purity is less than 9%, and preferably above 4%. The dominant wavelength is at least 487 nm. The glass composition also includes agents that modify optical properties in certain parts of the spectrum, notably in the UV region, such as CeO2, TiO2, WO3, La2O3 and V2O3, in amount not above 2%, preferably 1%. Independent claims are given for: (a) a float glass sheet of the above composition formed on a bath of molten metal; and (b) Glazing, notably car windows, formed from the above composition. |
