Ammonium Polyphosphate APP(n=1000)

Ammonium polyphosphate APP (n=1000) is an inorganic phosphorus based flame retardant with a chemical formula of (NH₄)ₙ₊₂PₙO₃ₙ₊₁（n=1000）, belonging to ultra-high molecular weight insoluble ammonium polyphosphate. Its appearance is white nanoscale powder (average particle size 2-5 μ m), with extremely high thermal stability (decomposition temperature>400 ℃), moisture absorption<0.1%, and flame retardant efficiency increased by 50%.It has high content of P and N flame retardant elements, good thermal stability, almost neutral, non-toxic and low smoke. Used in engineering plastics, rubber conveyor belts, and intumescent fire retardant coatings, it has low water solubility, low processing viscosity, and high flame retardancy. When used in coatings, It has better rheology and stability. With the same addition amount, Taixing’s Ammonium Polyphosphate APP (n=1000)has a higher expansion rate and denser carbon layer, generate a longer fire protection time.

Physical and Chemical Properties

Core performance:

Advantages of ultra-high molecular weight:

A polymerization degree of n=1000 forms a dense chain like molecular structure, compared to conventional APP (n=200-500):

Improved migration resistance by 8 times, no precipitation or crystallization after long-term use, suitable for long-term outdoor or high-frequency contact scenarios;

The thermal stability has exceeded 400 ℃ and can withstand high temperature environments such as industrial furnaces and engine compartments;

Forming a "molecular interlocking" effect with the resin substrate, the tensile strength retention rate of the material after addition is greater than 95%, and the transparency loss is less than 3%.

Triple flame retardant mechanism:

1. Gas phase suppression: Release a large amount of ammonia gas (NH3) at high temperatures, dilute the oxygen concentration to below 15% of the combustion critical value;

2. Condensed phase barrier: Generate a glassy polyphosphate layer, reducing the thermal conductivity to 0.05W/(m · K) and blocking heat conduction;

3. Free radical capture: Capture active groups such as · OH and · H in the combustion chain reaction to terminate the combustion cycle.

Application areas:

1. Aerospace and Rail Transit

Aircraft composite materials: used for aircraft seats, interior panels, and high-speed rail compartment partitions, meeting FAR 25.853 and EN 45545-2 HL3 flame retardant standards, with a smoke toxicity (SDR) of less than 5 during combustion, and complying with strict aviation safety requirements;

Engine insulation material: added to ceramic matrix composite materials (CMC), it provides flame retardant protection against high temperatures of 1200 ℃ and is suitable for aerospace engine compartments and rocket propulsion peripheral components.

2. New energy and energy storage industry

Lithium battery safety system: used for battery module casing (PA66-GF30) and electrolyte storage tank, with a flame retardant rating of UL94 V-0. At the same time, it has passed needle testing (no open flame spread) to reduce the risk of thermal runaway;

Photovoltaic module protection: APP (n=1000) is added to the modified EVA film, which is resistant to UV aging (>3000h) and has a flame retardant performance retention rate of>98%, in compliance with the IEC 61730-2 electrical safety standard.

3. Marine Engineering and Special Equipment

Deep sea exploration equipment: used for ROV (remotely operated vehicle) shell and cable sheath, resistant to seawater corrosion (salt spray test>10000h) and flame retardant grade up to FTPC Part 6, suitable for high pressure and high humidity environments in deep sea;

Military protective materials: Prepare tank armor lining and missile launch box flame retardant coating, meet GJB 150A military standard, and have both flame retardant and impact resistance properties.

4. High end electronics and smart devices

5G communication equipment: used for base station antenna covers (PC/ABS alloy), with a flame retardant rating of V-1 and a dielectric constant<3.5, to ensure the stability of high-frequency signal transmission;

Smart wearable devices: added to the wearable device housing (POM material) to achieve a balance between flame retardancy and lightweight, while also passing the skin contact safety certification (ISO 10993).

Packing and store:packing: 25kg/bag compound paper & plastic bag, or jumbo bag.

Store: storing in dry, ventilated and moistureproof conditions.

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