Patent ID: 8598055
Filing Date: 2013-12-03
Classification: C03C,Y02E

Abstract:
1. An alkali-free glass having a liquidus viscosity of greater than or equal to about 90,000 poises, a melting temperature less than or equal to about 1620° C., and an anneal point greater than or equal to about 725° C., said glass comprising SiO 2 , Al 2 O 3 , B 2 O 3 , MgO, CaO, SrO, SnO 2 , and Fe 2 O 3 , such that, in mole percent on an oxide basis: 64≦SiO 2 ≦68.2; 11≦Al 2 O 3 ≦13.5; 5≦B 2 O 3 ≦9; 2≦MgO≦9; 3≦CaO≦9; 1≦SrO≦5; 0.02≦SnO 2 ≦0.3; and 0.005≦Fe 2 O 3 ≦0.08; wherein: (i) the glass comprises less than 0.05% by weight of Sb (ii) the BaO content of the glass on an oxide basis is less than 1000 ppm by weight; and (iii) the glass is in the form of a plate produced by a fusion draw process.