| 摘要 |
This invention is directed to a transparent glass which, at a thickness of 2 mm, transmits less than 1% of ultraviolet radiation having a wavelength of 380 nm and exhibits a green fixed tint bounded by apices A,C,D,E,A of the drawing, a purity between 18-32%, and a dominant wavelength between 554-564 nm, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of -SiO2 65-72 Na2O + K2O 15-21 -B2O3 3-8 CaO 0-4 -Al2O3 0.5-5 ZnO 0-9 -Na2O 6-12 CaO + ZnO 1-5 -K2O 6-12 Fe2O3 4.8-7. -
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