Glass type

- Jan 15, 2019-

Some fire doors are equipped with integral windows which also have a rating, or have been incorporated at the time of the door test and be subject to the overall door's product certification. Fire-resistive windows must remain intact under fire conditions and hose stream impact resistance, and can include:

  • Wire mesh glass - usually Georgian wired

  • Liquid sodium silicate fills between two window panes

  • Ceramic glasses

  • Borosilicate glass

Wired glass typically withstands the fire, whereas the sodium silicate liquid also acts to insulate heat transfer, due to the endothermic action of this chemical.