Patent ID: 6118216
Filing Date: 2000-09-12
Classification: C03C,H01J

Abstract:
A lead and arsenic free borosilicate glass having a composition containing 13.5 to 16.8 weight percent B.sub.2 O.sub.3, 2.0 to 4.0 weight percent Al.sub.2 O.sub.3, 2.0 to 5.0 weight percent Na.sub.2 O, 1.3 to 4.0 weight percent K.sub.2 O, from 0 to 0.30 weight percent Li.sub.2 O, 0 to 1.0 weight percent CaO, 0 to 1.0 weight percent MgO, 0.05 to 0.17 weight percent Fe.sub.2 O.sub.3, 0.005 to 0.060 weight percent CeO.sub.2 and the balance SiO.sub.2, and wherein the sum of the amounts of Fe.sub.2 O.sub.3 and CeO.sub.2 comprise no greater than 0.19 weight percent and the sum of the amounts of Na.sub.2 O, K.sub.2 O and Li.sub.2 O comprise no greater than 7.5 weight percent.