Ammonium Polyphosphate Phase II (APP-II)

Application as a Fire Retardant

Ammonium Polyphosphate Phase or APP-II is a halogen free fire retardant used in a variety of plastics. At temperatures above 300 °C APP-II decomposes to polyphosphoric acid which dehydrates polyols, carbohydrates and other ROH and RNH containing substances. Subsequently, the generated char is expanded by water and ammonia to form a foamed up solid heat protective barrier.

Applications in Agriculture

APP-II finds application not only as a fertiliser for soil but also as a source of phosphorus. Its composition, rich in polyphosphates, provides a unique advantage in agricultural settings. The gradual breakdown of polyphosphate chains ensures an immediate as well as a sustained release of phosphorus, offering plants a readily digestible form of this essential nutrient. This gradual release mechanism aligns with the plants’ uptake capacity, ensuring optimal utilisation while minimising the risk of nutrient leaching or wastage. As a result, APP-II stands as a versatile solution for promoting robust plant growth and enhancing soil fertility over time.