Fire doors are mainly made from timber or steel – but in some cases, gypsum and aluminium – or a combination of all four.
Steel doors usually have higher fire ratings because steel is non-combustible and will not feed the fire.
Wooden fire-rated doors, meanwhile, usually contain a gypsum core – a heat-resistant and non-flammable soft mineral. Gypsum can be used in hollow steel doors too.
If a fire door has windows these will be made from borosilicate or ceramic glass – both of which are more fire resistant than standard glass. Such glass windows may contain anti-shattering wire mesh too.
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