Borosilicate glass is a type of glass with the main glass-forming constituents silica and boron oxide. Most borosilicate glass is flat borosilicate floated glass sheetú¼pressed glass and glass ceramic. Colored borosilicate. In addition to the quartz, sodium carbonate, and calcium carbonate traditionally used in glassmaking, boron is used in the manufacture of borosilicate glass. Typically, the resulting glass composition is about 70% silica, 10% boric oxide, 8% sodium oxide, 8% potassium oxide, and 1% calcium oxide (lime). Wooden case
