Patent ID: 7892999

Claim:
A float glass for a display substrate, characterized in that its composition consists essentially of, as represented by mass % based on oxide, from 52 to 62% of SiO 2 , from 5 to 15% of Al 2 O 3 , from more than 0% to 9% of MgO, from 3 to 12% of CaO, from 9 to 18% of SrO, from 2.6 to 13% of BaO, from 25.2 to 30% of MgO+CaO+SrO+BaO, from 6 to 14% of Na 2 O+K 2 O+Li 2 O, from 0 to 6% of ZrO 2 and from 0 to 1% of SO 3 , the temperature of glass melt corresponding to the viscosity of 10 2 dPa·s is at most 1,520° C., the temperature of glass melt corresponding to the viscosity of 10 4 dPa·s is at most 1,120° C., the glass transition temperature is at least 610° C., and the specific gravity is at most 2.9.