Patent ID: 8455375

Claim:
A glass plate comprising: as a glass matrix composition comprising, as represented by mass % based on oxide: SiO 2 65.0 to 73.0, Al 2 O 3 6.0 to 15.0, B 2 O 3 0 to 1.0, MgO 5.0 to 9.0, CaO 0 to less than 2.0, SrO 0 to 1.0, BaO 0 to 1.0, MgO+CaO+SrO+BaO 6.5 to 10.0, Li 2 O 0 to 1.0, Na 2 O 3.0 to 17.0, K 2 O 0 to 12.0, and Li 2 O+Na 2 O+K 2 O 10.0 to 18.0, wherein the glass plate has a heat shrinkage (C) of at most 15 ppm and a density of at most 2.46 g/cm 3 .