Patent ID: 8713967

Claim:
A process for making a glass sheet, comprising the following steps; (A) providing a glass material having an anneal point of at least 765° C. and a CTE that is about 26×10 −7 /° C., and not more than 42×10 −7 /° C.; (B) heating the glass material to a temperature not lower than a temperature T 1 corresponding to a viscosity of 1.0×10 10 poise; and (C) cooling the glass material from T 1 to a temperature T 2 corresponding to a viscosity of 1.0×10 15 poise at a cooling rate of CR, wherein 5° C./s≦CR≦200° C./s, wherein the glass material upon completion of step (C) has a measured compaction CM675, wherein |CM675|≦175 ppm.