Abstract: Sheet glass (2) is rendered fire resistant such that it will not shatter under a build-up of heat to 900.degree. C., by providing a thin coating (1) on one or both its surfaces, the coating being stable and adherent to the glass at up to 900.degree. C., the coating preferably comprising an oxide, nitride, oxynitride or fluoride of a metal or of silicon, or a metal silicide, the sheet having been toughened by tempering before or after coating and having its edges (3) ground and polished before the tempering step to remove all imperfections therefrom.