The material

70 to 80 percent by weight of borosilicate glass is sand. Seven to 13 percent is boron trioxide, four to eight percent is sodium and potassium oxide and two to seven percent aluminium oxide. Glass with this composition is highly resistant to chemicals and temperature fluctuation. That's why it is mainly used for chemical production applications, in laboratories, for ampoules and bottles containing pharmaceuticals, to package injectables, or as extremely durable lamp covers. Borosilicate glass is also used in the household for baking and soufflé dishes and other "heatproof" kitchenware.