NOVELTY - A glass plate contains (in mass%) silica (53-74), alumina (15-23), boric oxide (0-3), magnesium oxide (2-17), calcium oxide (0-12), strontium oxide (0-6), sodium oxide (0-9) and potassium oxide (0-6) as a glass matrix composition. The total content of magnesium oxide, calcium oxide and strontium oxide, is 6-28 mass%, and total content of sodium oxide and potassium oxide is 0.8-11 mass%. The glass plate further contains 100-500 ppm of sulfur trioxide, and has an average thermal expansion coefficient of 60x 10-7/ degrees C or less at 50-350 degrees C and strain point of 600 degrees C or more.    USE - Glass plate is used for manufacturing thin film transistor (TFT) panel (claimed) for liquid crystal display, plasma display and organic electroluminescent display, and as substrate for solar cell.    ADVANTAGE - The glass plate has low boric oxide content, low thermal expansion coefficient, and high strain point. The glass plate is excellent in homogeneity and flatness. The generation of crack in the glass plate during heat treatment process is prevented. The display quality of liquid crystal display is improved by using the glass plate as substrate.    DETAILED DESCRIPTION - A glass plate contains (in mass%) silica (53-74), alumina (15-23), boric oxide (0-3), magnesium oxide (2-17), calcium oxide (0-12), strontium oxide (0-6), sodium oxide (0-9) and potassium oxide (0-6) as a glass matrix composition. The total content of magnesium oxide, calcium oxide and strontium oxide, is 6-28 mass%, and total content of sodium oxide and potassium oxide is 0.8-11 mass%. The glass plate further contains 100-500 ppm of sulfur trioxide, and has an average thermal expansion coefficient of 60x 10-7/ degrees C or less at 50-350 degrees C and strain point of 600 degrees C or more. The glass matrix composition preferably contains silica (58-67), alumina (15-21), magnesium oxide (4-14), calcium oxide (0-5), strontium oxide (0-3), sodium oxide (1-9) and potassium oxide (0-5). An INDEPENDENT CLAIM is included for manufacture of glass plate.