Ammonium Polyphosphate (APP) Phase I

Name: Ammonium Polyphosphate (APP) Phase I
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 68333-79-9

Ammonium polyphosphate Phase I (APP I) is a lower-polymerization-degree, water-soluble intumescent flame retardant suited for textile backcoating, paper treatment, and aqueous formulations. With a polymerization degree of approximately 10–100, it dissolves readily in water, enabling straightforward incorporation into waterborne systems. APP I releases phosphoric acid and ammonia upon heating, creating an efficient char-forming mechanism for cellulosic substrates.

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Technical Specifications

appearance	White crystalline powder
pH (10% solution)	5.5–7.0
nitrogen content (%)	13–15
phosphorus content (%)	30–31
degree of polymerization	10–100
water solubility (25°C, g/100mL)	5–10

Applications

Waterborne flame-retardant textile backcoatings and finishes
Fire-retardant paper and cardboard impregnation
Aqueous intumescent coatings for wood and cellulosic substrates
Agricultural fertilizer–flame retardant dual-function formulations
Flame-retardant adhesives and binders in construction materials

Key Features

Water-soluble grade enables seamless integration into aqueous and waterborne formulations
Effective acid source and foaming agent in cellulosic and textile FR systems
Good compatibility with urea, dicyandiamide, and other nitrogen co-synergists
Cost-effective flame retardancy for non-durable or semi-durable textile applications