Properties:
As per the polymerization degree, APP has got three grades, i. E. High polymerization grade, medium polymerization grade and low polymerization grade, and as per the structure, it can be divided into crystalline product and amorphous product. The crystalline product has five varieties, namely from type I to type V. It is in white powder, not easily deliquescent, has got good compatibility with other auxiliaries, insoluble in water, odorless and poison-less. Its gravity is 2.3.
APP-II is a non-halogen flame retardant. It acts as flame retardant by intumescence mechanism. When APP-II is exposed to fire or heat, it decomposes to polymeric phosphate acid and ammonia. The polyphosphoric acid reacts with hydroxyl groups to form a nonstable phosphateester. Following dehydration of the phosphateester, a carbon foam is built up on the surface and acts as an insulation layer.
Uses: As a fire retardant it is mainly applied to anti-fire coatings, plastics, rubbers, plumber and paper etc.; It can also used as a fertilizer.
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