Xytu® APP-83C
APP Flame Retardant for Intumescent Coatings
APP-83C is a phase II ammonium polyphosphate flame retardant used as a component in intumescent fire-protective coating formulations.
Description
APP-83C consists of crystalline phase II ammonium polyphosphate. Its halogen-free phosphorus-nitrogen structure combines a high degree of polymerization with good thermal stability. During burning, it forms an expanded char layer that provides thermal insulation and limits air access, acting as a flame-retardant component in intumescent fire-protective coatings. Its low moisture absorption is relevant to formulation selection.
Packaging and Storage
Packed in 25 kg bags with a plastic inner liner and woven outer bag, or 500/1000 kg bulk bags. Keep the packaging closed and store in a cool, dry environment to reduce caking.
Technical parameters
| Name | Value |
|---|---|
| Appearance | White powder |
| P content | 31.5 wt% |
| N content | 14.5 wt% |
| Average degree of polymerization | ＞1000 |
| pH (10% aqueous solution) | 5.5–7.5 |
| Average particle size (D50) | 15–20 μm |
| Particle size <50 μm | ≥99 wt% |
| Moisture content | ≤0.25 wt% |
| Water solubility (25°C) | ≤0.5 g/100 mL |
| Decomposition temperature | 280 °C |