Fire Resistant many structural materials will require underlying gypsum sheathing in order to achieve a good fire-resistant rating, and gypsum board is the most commonly used fire-resistant interior finish. Gypsum board, also known as drywall, consists of a layer of gypsum sandwiched between two sheets of paper. Fire Resistant Gypsum board is specially treated with additives to further improve its fire-resistive qualities. The paper on the exterior of the Fire Resistant Gypsum board burns slowly and doesn’t contribute to fire spread.
In addition, gypsum board has a noncombustible core that contains chemically combined water (in calcium sulfate).
When affected by fire, the first thing that happens is that this water comes out as steam. This effectively impedes the transfer of heat through the gypsum board. Fire resistant Gypsum boards offer excellent fire protection due to its specially made core which has low conductivity and high heat absorption & can resist fire between 60 to 120 minutes depending upon their thickness and installation process.