Consisting primarily of 1% calcium oxide, 8% potassium oxide, 8% sodium oxide, 10% boric oxide and 70% silica, Borosilicate glass is a type of low soda glass.
While it is considerably more difficult to make Borosilicate glass than it is to make traditional glass, its superior durability makes Borosilicate glass very economical to produce.
The heat and chemical resistance properties of Borosilicate glass are of exceptional use in military, chemical laboratory and other applications.
The very low (~3×10-6/°C at 20 °C) thermal expansion coefficient of Borosilicate glass make it a very popular material for a variety of critical display equipment and flat TFT screens.
In optical terms, Borosilicate glass is a crown glass with comparatively low refractive indices of 1.51 to 1.54 (across visible range) and low dispersion.