GLASS PLATE, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING TFT PANEL

摘要

Disclosed is a glass plate having a low B2O3 content, which can be used as a glass plate for LCD panels or the like. Specifically disclosed is a glass plate containing, in terms of oxides, 53-74 mass % of SiO2, 15-23 mass% of Al2O3, 0-3 mass% of B2O3, 2-17 mass% of MgO, 0-12 mass% of CaO, 0-6 mass% of SrO, with MgO + CaO + SrO being 6-28 mass%, 0-9 mass% of Na2O, and 0-6 mass% of K2O with Na2O + K2O being 0.8-11 mass%, as a glass matrix composition. This glass plate further contains 100-500 ppm of SO3, while having an average thermal expansion coefficient of not more than 60 OE10-7/°Cwithin the temperature range from 50°C to 350°C and a strain point of not less than 600°C.