Ammonium Polyphosphate APP(n=200) has the chemical formula MF(NH4PO3)n and CAS number 68333-79-9. It is a phosphorus-nitrogen type halogen-free flame retardant with crystal form II and n>200. This flame retardant is basically insoluble in water, has good long-term weather resistance, can withstand medium and high processing temperatures, and can form a dense protective char layer when burning in a fire, separating flammable gases and heat.
APP is a unique flame retardant that combines three aspects to achieve its flame-retardant effect: acid source, carbon source, and gas source.
When heated, ammonium polyphosphate decomposes to produce polyphosphoric acid, which acts as a strong acid catalyst, causing the material to dehydrate and carbonize. The carbon elements in the polymer matrix are catalyzed to form a char layer, and the flame retardant itself also decomposes to release non-flammable gases. These three effects work synergistically in the early stages of a fire, forming a thick, porous, and heat-insulating char layer on the material surface, isolating substances that would intensify combustion from the external environment, thus achieving a flame-retardant effect.
● Good thermal stability.
● Low viscosity, good dispersion.
● Aggregation degree balance
● Low water solubility, good resistance to precipitation and migration.
● Excellent flame retardant efficiency
● High purity, narrow particle size distribution range.
● Excellent water resistance and durability
● Environmental Protection and Safety
● Excellent physical compatibility
| Item | APP I | APP II |
| Appearance | — | White Powder |
| P2O5 content % | ≥70.0 | ≥71.0 |
| Nitrogen content % | ≥14.0 | ≥14.0 |
| Mean polymerization Ñ | ≥200 | ≥1000 |
| Solubility（g/100mLH2O） | --- | ≤1.0 |
| Moisture ω/%, 130℃ | --- | ≤0.25 |
| PH value | 5.0-7.0 | 5.5-7.5 |
| Mean particle diameter (D50) µ m | --- | ≤20 |
● used to produce intumescent type fire-retardant coating.
● used in plastic, rubber, coating, adhesives, sealant, and fiber.
● applied in flame retarding treatment of wood, paper, and fibreboard.
● applied in epoxy resin or unsaturated polyester.
Packing and store: 25kg/bag compound paper & plastic bag, or jumbo bag.
Store: storing in dry, ventilated and moistureproof conditions.
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