Ammonium Polyphosphate Phase II (APP-II)

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.

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