ANTIFLAME™ APP-401 is a white, non-hygroscopic and non-flammable crystalline Phase II type ammonium polyphosphate coated with silicone that has cross linked/branched structure having a molecular weight of > 1000 and has a high thermal stability (= 300°C) and low water solubility (= 0.5g/100ml).

It behaves as an intumescence type of a flame retardant wherein the product when exposed to fire or heat, gets decomposed into polymeric phosphoric acid and ammonia. The polymeric phosphoric acid then reacts with the hydroxyl or other functional groups present in the substrate to form a non stable phosphate ester which undergoes dehydration to form an insulating carbon char against the heat surface. This carbon barrier / char thus act as an insulator layer, shielding further decomposition of the substrate into flammable entities.