| 摘要 |
<p>A medium grey glass having a composition comprising by weight: 68 to 75 % SiO2, 10 to 18 % Na2O, 5 to 15 % CaO, 0 to 10 % MgO, 0 to 5 % A12O3, and 0 to 5 % K2O, where CaO + MgO is 6 to 15 % and Na2O + K2O is 10 to 20 %; and colorants consisting essentially of: Fe2O3 in an amount greater than 0.5 and less than 0.9 wt.%; 0.1 to 1.0 wt.% Mm02; 0.002 to 0.010 wt.% Co; 0.0005 to 0.003 wt.% selenium; and 0-1.0 wt.% Ti02, the glass having at a 4.0 mm thickness: 485-570 dominant wavelength, less than 5.0 % purity of excitation, less than 40 % ultraviolet transmittance at measured over 300-400 nm, less than 45 % infrared transmittance measured over 760-2120 nm, with 35-60 % light transmittance using Illuminant A.</p> |
