Ammonium polyphosphate

Ammonium polyphosphate from Weifang Dudeli Chemical Industry Co., Ltd is a nitrogen and phosphorus bearing flame retardant supplied as a white crystalline powder. The compound provides a high phosphorus content, typically 30 to 32 percent P2O5, and a nitrogen content around 14 to 16 percent, which together create an intumescent char layer in polymer systems under heat. It is non-toxic and compatible with common thermoplastics such as polypropylene, polyethylene and ABS, making it suitable for injection moulded parts that need self-extinguishing behaviour.

The material is generally offered in two forms, APP-I and APP-II, with APP-II exhibiting a higher molecular weight and better thermal stability for processing above 250 °C. Typical industry grades have a pH between 5.5 and 7.0 in 10 percent aqueous solution, a particle size distribution of D50 10 to 20 micron for smooth dispersion, and a moisture content below 0.5 percent for long shelf life. These properties are standard for intumescent flame retardants used in plastics, textiles and construction panels.

Manufacturers in electronics, automotive interiors and building materials use this grade to meet UL94 V-0, V-1 or V-2 standards without adding halogenated compounds. Buyers usually source in 25 kg multiwall paper bags on pallets or 500 to 1000 kg big bags, with incoterms FOB Qingdao or CIF destination port. Confirm packaging and shipping terms with Weifang Dudeli Chemical Industry Co., Ltd before ordering.

Weifang Dudeli Chemical Industry Co., Ltd is registered at Room 412, The 9th Building No.127 Raodong Road, Hangzhou, Zhejiang Province, China. The company appears in import records as an exporter of chemical products, including flame retardants, with a presence in the international market for industrial additives.

The supplier profile shows a harbor trust tier and an imported supplier tier, indicating established cross-border activity. Response rate data is not available, so buyers should contact directly to confirm lead times, minimum order quantities and certification documentation for their intended application.