Halogen Free APP Ammonium Polyphosphate Fire Retardant Cas 68333-79-9

Halogen Free Ammonium Polyphosphate Flame Retardant Additives For Powder Extinguishing Agent

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

HS CODE: 2835.3990
Model No.: TF-201

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.

Specification :

APP Phase II has an high polymerization degree, with n>1000, its structure is cross linked (branched), and it is an high-quality non-halogenated flame retardant. APP phase II, Ammonium polyphosphate, has an higher thermal stability (the decomposition starts at approximately 275°C) and lower water solubility than APP I.

Charateristics:

1. Halogen-free and environmentally friendly flame retardant

2. Low water solubility, extremely low aqueous solution viscosity, low acid value

3. Good thermal stability, migration resistance and precipitation resistance

4. The particle size is extremely small, especially suitable for occasions with high particle size requirements, such as high-end fireproof coatings, textiles

Coating, polyurethane rigid foam, sealant, etc.;

5. Biodegradable into phosphorus and nitrogen compounds

How does flame retardant work?

Ammonium polyphosphate has a key useful property - flame retardant due to thermal expansion. Intumescent coatings will expand when exposed to high temperatures to against fire, and polyphosphate acid appears on the substrate (metal, wood). It is a product of dehydration and heating. If we are talking about a surface of organic matter, then a carbon film is formed. It does not allow fire to spread. It works like this - a large volume of non-combustible gases is generated, a thick foam appears, which acts as a layer of thermal insulation, and as a result, the material is protected from air and ceases to heat up.

When fire retardant paint burns, it emits some smoke. It contains very few toxic gases, so the coating is classified as non-hazardous. For paint, which includes such a flame retardant, the price is determined by its other components and the resulting properties. The material meets all the requirements of passive fire protection, which are presented to modern compositions.