Cement (Portland cement, magnesium chloride or inorganic high temperature binder, etc.), aggregate (expanded vermiculite, expanded perlite, aluminium silicate fiber, mineral wool, rock wool, etc.), chemical aids (modifier, hardener, water-repellent, etc.), water. Portland cement, magnesium chloride cement and inorganic binder for steel structure fire resistant coating base materials. Inorganic binders commonly used include alkali metal silicate and phosphates, etc.