NOVELTY - A non-alkali glass has strain point of 710-725 degrees C, average coefficient of thermal expansion of 30-43x 10-7/ degrees C at 50-300 degrees C, and glass viscosity of 102 dPa.seconds and 104 dPa.seconds at less than 1710 degrees C and less than 1320 degrees C, respectively. The non-alkali glass comprises 66-70 mol% silicon dioxide, 12-14 mol% aluminum trioxide, 0-1.5 mol% barium trioxide, 9.5-13 mol% magnesium oxide, 4-9 mol% calcium oxide, 0.5-4.5 mol% strontium oxide, 0-0.5 mol% barium oxide, and 0-2 mol% zirconium dioxide.    USE - Non-alkali glass is used for substrate of photomask and solar cell, and display board.    ADVANTAGE - The non-alkali glass is stable at high strain point and easily manufactured by float glass process.    DETAILED DESCRIPTION - A non-alkali glass has strain point of 710-725 degrees C, average coefficient of thermal expansion of 30-43x 10-7/ degrees C at 50-300 degrees C, and glass viscosity of 102 dPa.seconds and 104 dPa.seconds at less than 1710 degrees C and less than 1320 degrees C, respectively. The non-alkali glass comprises 66-70 mol% silicon dioxide, 12-14 mol% aluminum trioxide, 0-1.5 mol% barium trioxide, 9.5-13 mol% magnesium oxide, 4-9 mol% calcium oxide, 0.5-4.5 mol% strontium oxide, 0-0.5 mol% barium oxide, and 0-2 mol% zirconium dioxide. The total content of magnesium oxide, calcium oxide, strontium oxide and barium oxide is 17-21 mol%. A ratio of content of magnesium oxide and total content of magnesium oxide, calcium oxide, strontium oxide and barium oxide is more than 0.4. A ratio of magnesium oxide and total content of magnesium oxide and calcium oxide is more than 0.4. The ratio of content of magnesium oxide and total content of magnesium oxide and strontium oxide is more than 0.6. An INDEPENDENT CLAIM is included for manufacture of non-alkali glass, which involves using siliceous sand as raw material for silicon dioxide particles, having average particle size of 20-27 mu m where content of siliceous sand having particle size of 2 mu m or less is 0.3 vol.% or less and siliceous sand having particle size of 100 mu m is 2.5 vol.%.