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Ammonium polyphosphate(Phase II)
is a non-halogen flame retardant. It acts as flame retardant by intumescence mechanism.
When APPII 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.
Specification :
Specification | Value | |
Appearance | White powder | |
P Content | %(w/w) | ≥31 |
N Content | %(w/w) | >14 |
Decomposition Temperature | ¡æ | >270 |
Density(25¡æ) | g/cm3 | ~1.9 |
Solubility | g/100ml H2O, 25¡æ | ~0.5 |
pH value | ( 10% aqueous suspension ) | 5.5-7.5 |
Viscosity | (10%suspension, 25oC) | <100 |
Monisture | %(w/w) | <0.25 |
Average particle size | µm | ~15 |
Particle size(<50 µm) | %(w/w) | >97 |
Use :In plastics(PP, PVC, PE, etc. ), Polyester, Rubber, and Expandable fireproof coatings.
Packing : 25kg woven bag with plastic liner.
Ammonium polyphosphate(APP)