Fire retardant coating is a special coating used on the surface of combustible substrate, which can reduce the flammability of the coated material, block the rapid spread of fire and improve the fire resistance of the coated material. It is coated on the surface of combustible substrate to change the combustion characteristics of the material surface and block the rapid spread of fire; Or a special coating coated on building components to improve the fire resistance of components, which is called fire retardant coating.
The basic components of thick steel structure fire retardant coating are: binder (Portland cement, magnesium oxychloride or inorganic high temperature binder, etc. ), aggregate (expanded vermiculite, expanded perlite, aluminum silicate fiber, mineral wool, rock wool, etc. ), chemical additives (modifiers, hardeners, waterproofing agents, etc. ) and water. Portland cement, magnesium oxychloride cement and inorganic binder are the base materials of fire retardant coatings for steel structures. Commonly used inorganic binders include alkali metal silicates and phosphates.