Ammonium polyphosphate CAS 68333-79-9 , abbreviated as APP, is a nitrogen-containing phosphate that is a white powder. Ammonium polyphosphate can be divided into three types based on its degree of polymerization: low polymer, medium polymer, and high polymer. The higher the degree of polymerization, the smaller the water solubility. Crystalline ammonium polyphosphate is a water-soluble and long-chain polyphosphate. There are five variants from I to V type. Among them, highly polymerized Chemicalbook crystalline type II ammonium polyphosphate has significant advantages in the field of polymer materials due to its good water solubility, high decomposition temperature, and good compatibility with polymer materials. Compared with halogenated flame retardants, crystalline type II ammonium polyphosphate has the characteristics of low toxicity, low smoke, and inorganic properties, making it a new type of high-efficiency inorganic flame retardant.

Chinese name: ammonium polyphosphate

Chinese synonym: Flame retardant R-A powder; Ammonium polyphosphate; Ammonium polyphosphate; Ammonium polyphosphate; Ammonium polyphosphate flame retardant; Ammonium polyphosphate APP1002 (silicon coated); Ammonium polyphosphate APP1001 (coated with melamine); Ammonium polyphosphate APP1000 (without coating)

English name: Amoniumpolyphosphate

Synonyms in English: polyphomoricacidsammoChemicalbookniumsalts; APP; APP0; XAP-01; APP3; APP1; Ammoniumpolyphosphateflamerepardant; Amoniumpolyphosphate

CAS number: 68333-79-9

Molecular formula: H12N3O4P

Molecular weight: 149.086741

EINECS number: 269-789-9

Physical and chemical properties

Ammonium polyphosphate has a white powder appearance, close to neutral, and can be mixed with any other substance without any chemical changes. Short chain (n ≤ 20) APP has water solubility, while long chain (n>20) APP is difficult to dissolve in water. The solubility of industrial APP in water is 1.3g/100mL (15 ℃) or 3.0g/100mL (25 ℃ Chemicalbook), and the solubility increases significantly with temperature. APP can be hydrolyzed, and the hydrolysis rate varies with particle size, temperature, and pH value. As temperature increases and pH value decreases, hydrolysis accelerates. The APP has good thermal stability, with a thermal decomposition temperature above 250 ℃. During decomposition, ammonia and water are released, and phosphoric acid is generated. It decomposes completely at 700 ℃. The remaining 6% to 7% residue.

Purpose

Used as a flame retardant for flame-retardant fibers, wood, plastics, fireproof coatings, etc. Can be used as fertilizer.

Inorganic additive flame retardant used in the manufacturing of flame retardant coatings, Chemicalbook flame retardant plastics, and flame retardant rubber products

Organizational improvers; Emulsifier; Stabilizer; Chelating agent; Yeast feed; Curing aids; Water binder. Used for cheese, etc.

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