NOVELTY - An alkali-free glass comprises 57-67.5 %mass silicon dioxide, 17-25 %mass aluminum oxide, 1-7-5.5 %mass boron trioxide, 2-8.5 %mass magnesium oxide, 1-5.8 %mass calcium oxide, 2-10 %mass strontium oxide, 0-1 %mass barium oxide, 0-2 %mass zirconium dioxide, 0.15-0.35 %mass chlorine, 0.01-0.25 %mass fluorine and 1-25 ppm sulfur trioxide. The alkali-free glass has strain point of 680-735 degrees C, average thermal expansion coefficient at 50-350 degrees C of 30x 10-7-43x 10-7/ degrees C, glass viscosity of 102 dPa.second at 1710 degrees C or less, and glass viscosity of 104 dPa.second at 1310 degrees C or less.    USE - Alkali-free glass is used for display board, substrate for photomask, substrate for information recording media and substrate for solar cell.    ADVANTAGE - The alkali-free glass has excellent clarification property during manufacture of glass, high strain point, and is amenable to float forming.    DETAILED DESCRIPTION - An alkali-free glass comprises 57-67.5 %mass silicon dioxide, 17-25 %mass aluminum oxide, 1-7-5.5 %mass boron trioxide, 2-8.5 %mass magnesium oxide, 1-5.8 %mass calcium oxide, 2-10 %mass strontium oxide, 0-1 %mass barium oxide, 0-2 %mass zirconium dioxide, 0.15-0.35 %mass chlorine, 0.01-0.25 %mass fluorine and 1-25 ppm sulfur trioxide. The alkali-free glass has strain point of 680-735 degrees C, average thermal expansion coefficient at 50-350 degrees C of 30x 10-7-43x 10-7/ degrees C, glass viscosity of 102 dPa.second at 1710 degrees C or less, glass viscosity of 104dPa.second at 1330 degrees C, and ( beta )-OH value of 0.15-0.45 mm-1. The total content of magnesium oxide, calcium oxide, strontium oxide and barium oxide is 12-21 %mass. The content of magnesium oxide, calcium oxide and strontium oxide is more than 0.15 %mass, less than 0.60 %mass and less than 0.70 %mass, respectively, with respect to total content of magnesium oxide, calcium oxide, strontium oxide and barium oxide. An INDEPENDENT CLAIM is included for manufacture of alkali-free glass.