Patent ID: 6524713
Filing Date: 2003-02-25
Classification: C03C,Y10S

Abstract:
An ultraviolet/infrared absorbent low transmittance glass consisting of base plate and colorants, said base glass comprising:60 to 85 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. % B203, said colorants comprising: 1.25 to 1.5 wt. % total iron oxide (Tâ€”Fe2O3) expressed as Fe2O3; 0.01 to 0.019 wt. % CoO; more than 0.001 wt. % and equal to or less than 0.003 wt.% Se; and 0.06 to 0.1 wt. % NiO, wherein said glass with a thickness between 2 and 5 mm has a visible light transmittance (YA) by the C.I.E. illuminant â€œAâ€  in a range from 10% to 25%, a solar energy transmittance (TG) in a range from 5% to 20%, and an ultraviolet transmittance (Tuv) of not more than 15% specified by ISO.