Aluminium silicate glass, (trade name e.g. Gorilla glass) is a thin glass; usual thicknesses are between 0.4 and 2.3 mm. It is more scratch-resistant than float glass and offers excellent optical properties, which is why it is often used for displays of smartphones and tablet computers.
Unlike float glass, aluminium silicate glass can only be chemically toughened (by ion exchange). The thermal transformation to tempered safety glass is not possible.