ammonium polyphosphate

Molecular formula : (NH4PO3)n n>1000
CAS No.: 68333-79-9
EINECS No.: 269-789-9
Ammonium polyphosphate (Phase 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.

Advantage of APP:
Cost saving
Compared to other halgen-free systems, APP requires lower loadings ensuring lower cost, better properties retention and excellent flow.
High performance
APP allows FR materials to demonstrate: excellent processability, good retention of mechanical & electrical properties
Environmentally-friendliness
APP is an intumescent halogen-free FR which does not generate additional quantities of smoke.

Specification Value
Appearance White powder
P2O5 Content %(w/w) ≥71
N Content %(w/w) ≥14
Decomposition Temperature ℃ >270
Solubility g/100ml H2O, 25℃ ~0.5
pH value ( 10% aqueous suspension ) 5.5-7.5
Viscosity (10%suspension, 25oC) <100
Monisture %(w/w) <0.25
mesh >325

application:
Applied in fibre materials(paper, timber, vehicle fireproofing fabric, fibre matters )
Applied in out-door waterproofing, sunproofing and fireproofing polymer;
Applied in epoxy resins and unsaturated resins.
Applied in cable and rubber;
Applied in brust of electric equipments;
Applied in fabrics.

1, Solvent based intumescent coatings.
2, Water based intumescent coatings.
3, Flame retardant for flexible and rigid urethane foams.
4, Flame retardant for unsaturated polyesters.
5, Flame retardant for epoxies.
6, Flame retardant for acrylics.
7, Flame retardant for polyurethanes.