Patent ID: 6867158

Claim:
A glass comprising: a substantially alkali-free aluminoborosilicate glass; said glass having the composition (in % by weight, based on oxide): SiO 2 >58 − 65 B 2 O 3 >6 − 11.5 Al 2 O 3 >14 − 25 MgO 4 − 8 CaO 0 − 8 SrO 2.6 − <4 BaO 0 − <0.5 with SrO + BaO >3 ZnO 0.5 − 2; said composition of said SiO 2 , said B 2 O 3 , said Al 2 O 3 , said MgO, said CaO, said SrO, said BaO, said SrO+BaO, and said ZnO being selected to provide all of (i.), (ii.), (iii.), and (iv.), wherein (i.), (ii.), (iii.), and (iv.) comprise: (i.) a coefficient of thermal expansion α 20/300 of between 2.8×10 −6 /K and 3.8×10 −6 /K; (ii.) a glass transition temperature, T g , of more than 713 degrees Celsius to maximize heat resistance of said glass; (iii.) a temperature at a viscosity of 10 2 dPas of at most 1694 degrees Celsius; and (iv.) a processing temperature, V A , at a viscosity of 10 4 dPas of at most 1273 degrees Celsius.