NOVELTY - Producing (M1) a glass involves: preparing glass raw materials mixed so that a glass having silica-alumina-boric acid-metal oxide based composition, and having melting temperature corresponding to 102.5 poise of greater than or equal to 1580 degrees C, density of less than or equal to 2.5 g/cm3, average thermal coefficient of 25-36x 10-7/ degrees C at 30-380 degrees C, and strain point of greater than or equal to 640 degrees C is obtained; electrically melting the materials in melting furnace made up of high zirconia refractory; and refining, homogenizing and forming glass melt; where the materials are mixed so that alkali content of resultant glass is 0.01-0.2 mass%.    USE - For producing a glass for a display substrate (claimed) useful in a flat display substrate such as a liquid crystal display and an electroluminescent (EL) display and as a glass substrate material for an image sensor of a charge coupling device (CCD), and an equivalent close-type solid image pickup device (CIS), and for a solar cell.    ADVANTAGE - The glass for a display substrate produced by this method, has a low density, low expansion and a high strain point, and hardly causes devitrification at forming even when electrically melted in a melting furnace constructed of a high zirconia refractory. Since even when the glass for a display substrate is electrically melted in a melting furnace constructed of a high zirconia refractory from necessity of high, temperature melting, erosion of the refractory is little, the glass is hardly devitrified. The glass has a low density, low expansion, and a high strain point; is small in a thermal compaction amount or a sag amount; is excellent in thermal shock resistance; and has warpage which is hardly occurred. Although high temperature melting is necessary in the method, a glass having no seed and no devitrification, and having a low density, low expansion and a high strain point can be produced without repairing a melting furnace for a long term, and the glass of high quality can be provided at a low cost.    DETAILED DESCRIPTION - Producing (M1) a glass for a display substrate involves: preparing glass raw materials mixed so that a glass having a silica-alumina-boric acid-metal oxide based composition of formula SiO2-Al2O3-B2O3-RO (where RO is at least one of magnesium oxide (MgO), calcium oxide (CaO), barium oxide (BaO), strontium oxide (SrO) and zinc oxide ZnO), and having a melting temperature corresponding to 102.5 poise of greater than or equal to 1580 degrees C, a density of less than or equal to 2.5 g/cm3, an average thermal coefficient of 25-36x 10-7/ degrees C in a temperature of 30-380 degrees C, and a strain point of greater than or equal to 640 degrees C is obtained; electrically melting the glass raw materials in a melting furnace constructed of a high zirconia refractory; and refining, homogenizing and forming the glass melt; where the glass raw materials are mixed so that an alkali content of the resultant glass is 0.01-0.2 mass%. An INDEPENDENT CLAIM is included for a glass for a display substrate, which is produced by the method (M1).