Patent ID: 6207603
Filing Date: 2001-03-27
Classification: C03C

Abstract:
A borosilicate glass that has properties that enable the glass to be drawn as microsheet, that has a transmission greater than 90% at wavelengths between 380 and 1200 nm., that has a sharp cutoff between 310 and 370 nm., that has a transmission no greater than 50% at 330 nm., and that has a composition consisting essentially of, expressed in terms of weight percent on an oxide basis:SiO.sub.2 59-69 ZnO 6.5-8.5 B.sub.2 O.sub.3 8.5-14 CeO.sub.2 0.25-3 Al.sub.2 O.sub.3 2-2.5 TiO.sub.2 0-1 Na.sub.2 O 5.5-12.5 CeO.sub.2 + TiO.sub.2 0.5-3.5 K.sub.2 O 0-8 Sb.sub.2 O.sub.3 0-0.5.