Abstract: A flame retardant for wood application characterized as a fire retardant made of phosphorus ammonium polyphosphate, with the chemical formula (NH4) n+2PnO3n+1, that can be used in watery and not-watery applications, in flame retardant inks and latex inks, applied during ink's formularization, and later applied, through the coating process in the phase of finishing of the construction, where the coating can be applied by brush, coil, airless pistol or other conventional means, and based on its easy application it can be used in new construction and in building rehabilitation.