Patent ID: 8753993

Claim:
An alkali metal-free glass comprising in mole percent on an oxide basis: SiO 2 65.0-72.0 Al 2 O 3 9.0-16.0 B 2 O 3 1.0-5.0 MgO + La 2 O 3 1.0-7.5 CaO 2.0-6.0 BaO 1.0-7.0 wherein: (i) when the glass comprises the optional component SrO, the glass satisfies the relationship: [BaO]/[SrO]≧2.0, where [BaO] and [SrO] represent the mole percents of BaO and SrO, respectively, (ii) the glass has a strain point greater than or equal to 700° C., and (iii) the glass exhibits a dimensional change of less than 30 ppm for a 5 minute heat treatment at 600° C.