Patent ID: 7951734

Claim:
A glass plate for a substrate, which comprises, as a glass matrix composition as represented by mass % based on oxide: SiO 2 68 to 80, Al 2 O 3 0.1 to 5, B 2 O 3 0 to 3, MgO 10 to 12, CaO + SrO + BaO 0 to 2, LiO 2 0 to 2, and Na 2 O + K 2 O 6 to 14 has a density of at most 2.45 g/cm 3 , has an average coefficient of thermal expansion from 50 to 350° C. of at most 75×10 −7 /° C., has a glass transition point of at least 600° C., and has a brittleness of at most 6.0 μm −1/2 .