Ammonium Polyphosphate (APP)

Identification

Synonyms: APP; Polyphosphoric acids, ammonium salts

CAS No.: 68333-79-9

Molecular Formula: (NH4PO3)n

Structural Formula:

Phase II:

Application*

Phase I: intumescent flame-retardant component for coating, wood, paper, plywood, cable, fiber, plastic, rubber, resin, component of fire-extinguishing dry-powder for fire of forest, oil-well, and coal mine.

Phase II: Due to its low solubility in water, Phase II APP is particularly suitable as an "acid donor" for intumescent flame-retardant paints or coating, which is applied in steel structures, wood/plastic applied in building material, adhesives and sealants, non-halogenated flexible and rigid polyurethane foams, as well as cellulose-contained paper and wood products

Specification*

Item	Phase I	Phase II	Phase II Microencapsulated by Melamine
P content	-	31-33%	28% min.
N content	14~15%	13-15%	15.5% min.
P2O5 Content	69% min.	-	-
water	-	0.25% max	1.0% max.
Average Polymerization Degree	70	>1000	>1000
PH (1% water suspension/solution)	5.5~6.5	5.5-7.5	6.5~7.5
PH (10% water Solution)	5.2~6.2	-	-
Water Soluble Matter (25 deg. C, 10% suspension)	-	0.5% max	0.05% max.
Viscosity in Water (25 deg. C, 10% suspension)	-	100mPa.S max	20mPa.S max.
Density	-	1.9g/cm3	1.9g/cm3
Bulk density	-	~0.7g/cm3	~0.7g/cm3
Decomposition T	-	275 deg C.	300 deg. C
Average particle size	325 mesh	8~15 microns	10~20 microns
Appearance	white powder	white powder	white powder

Standard Packing

25kgs net /paper bag with PE lining bag; 1000kg/supper sacks

Risks and Safety Info

Not regulated by UN, US DOT, EU

May cause slight skin irritation but not irritating to the mucous membranes.

S 24/25 Avoid contact with skin and eyes

React with alkaline solutions to form ammonia and can contribute to eutrophication of stagnant waters.