Patent ID: 6436860
Filing Date: 2002-08-20
Classification: C03C

Abstract:
An ultraviolet/infrared absorbent low transmittance glass consisting of base glass comprising:65 to 80 wt. % SiO2; 0 to 5 wt. % Al2O3; 0 to 10 wt. % MgO; 5 to 15 wt. % CaO wherein a total amount of MgO and CaO is between 5 and 15 wt. %; 10 to 18 wt. % Na2O; 0 to 5 wt. % K2O wherein a total amount of Na2O and K2O is between 10 and 20 wt. %; and 0 to 5 wt. % B2O3, and colorants comprising:1.0 to 1.6 wt. % total iron oxide (T-Fe2O3) expressed as Fe2O3; more than 0.019 wt. % and equal to or less than 0.05 wt. % CoO; more than 0.0008 wt. % and equal to or less than 0.003 wt. % Se; and more than 0.05 wt. % and equal to or less than 0.1 wt. % NiO, wherein said glass with any one of thicknesses between 1.8 mm and 5 mm has a visible light transmittance (YA) by the C.I.E. illuminant â€œAâ€  in a range from 5% to 25%, a solar energy transmittance (TG) in a range from 5% to 25%, and an ultraviolet transmittance (Tuv) specified by ISO of not more than 15%.