Fire-retardant wood is treated with what substance?

Fire-retardant wood is treated with mineral salts, which are chemical compounds that function by imparting fire resistance to the wood. These salts, often made from elements such as boron, phosphorus, and ammonium, work by creating a chemical reaction when exposed to heat. This reaction helps to slow down the combustion process, reduce the spread of flames, and lower the production of smoke and toxic gases.

The use of mineral salts is an established method in the preservation of wood products, making them safer for construction in environments where fire risk is a concern. This treatment enhances the wood's overall durability while providing significant fire protection, which is essential in meeting safety regulations and building codes.