NOVELTY - A boron aluminosilicate glass article, which is substantially free of lithium, comprises glass composition consisting of 40-75 mol.% silica (SiO2), 8-20 mol.% alumina (Al2O3), 0.1-20 mol.% sodium oxide+potassium oxide (Na2O+K2O), 0-8 mol.% magnesium oxide+calcium oxide+barium oxide+strontium oxide (MgO+CaO+BaO+SrO), 0-5 mol.% zirconia (ZrO2), 1-30 mol.% boron trioxide (B2O3), and 0-1 mol.% ceria (CeO2).    USE - A boron aluminosilicate glass article for manufacturing chemically toughened glass article, preferably housing or cover of electronic device or mobile electronic device, such as watch, cellphones, touchpad, GPS-system, smart phones, visual display-system in hospital, tablet personal computer, notebooks, personal digital assistant, and cover for non-mobile devices (TV, PC, ATM machines, industrial displays), flexible cover on folding screening display, organic LED, cover for touch displays, protection windows, automotive windows, train windows, aviation hard disk substrate, high temperature instrument panel or solar cell substrate, or used for white goods, including refrigerator or cooking tool (all claimed).    ADVANTAGE - Non-bridge oxygen produced by alkali earth oxides can be controlled, and good chemical toughening properties can be achieved. The glass has high thermal 15 shock resistance, high heat conductive coefficient, and high surface tension. Refractive index of the glass article can be adjusted by ion exchange to match the refractive index of sapphire which is used to improve lighting output efficiency of the application. Glass article can be crystallized on the surface by ion exchange to improve glass strength, hardness, and scratch resistance.    DETAILED DESCRIPTION - A boron aluminosilicate glass article, which is substantially free of lithium, comprises glass composition consisting of 40-75 mol.% silica (SiO2), 8-20 mol.% alumina (Al2O3), 0.1-20 mol.% sodium oxide+potassium oxide (Na2O+K2O), 0-8 mol.% magnesium oxide+calcium oxide+barium oxide+strontium oxide (MgO+CaO+BaO+SrO), 0-5 mol.% zirconia (ZrO2), 1-30 mol.% boron trioxide (B2O3), and 0-1 mol.% ceria (CeO2). Ratio R'O/R2O is less than or equal to 0.7, preferably less than or equal to 0.6.    R'O=MgO+CaO+SrO+BaO; and    R2O=Na2O+K2O in which R'O and R2O are greater than or equal to 0.    An INDEPENDENT CLAIM is included for manufacture of boron aluminosilicate glass article which involves pre-heating glass article to 300-400 degrees C for 5-30 minutes, chemically toughening in molten salt at 350-490 degrees C for 1-16 hours, and post-annealing at 300-400 degrees C for 5-30 minutes.