Diammonium Phosphate (DAP) Flame Retardant

Name: Diammonium Phosphate (DAP) Flame Retardant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 7783-28-0

Diammonium phosphate (DAP) is a water-soluble, nitrogen–phosphorus flame retardant used for fire retarding cellulosic materials including wood, cotton, paper, and agricultural residues. It decomposes on heating to yield phosphoric acid and ammonia, creating an effective char-promoting and gas-diluting fire suppression mechanism. DAP is particularly valued in fire-retardant wood treatment, paper manufacturing, and as a component of dry chemical fire-fighting powders.

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Technical Specifications

appearance	White crystalline granules or powder
purity (%)	≥98
moisture (%)	<0.3
nitrogen content (%)	21–22
phosphorus content (%)	23–24
pH (1% solution, 25°C)	7.8–8.2

Applications

Wood fire-retardant treatment by pressure impregnation or surface spraying
Paper and textile fire-retardant treatment in industrial processes
Component in ABC dry chemical fire extinguisher powder formulations
Cellulosic and agricultural waste biomass fire suppression treatment
Flame-retardant mortar and gypsum board additive for construction

Key Features

High combined N+P content (44–46%) delivers excellent flame retardancy efficiency per kg
Alkaline pH (7.8–8.2) provides better wood compatibility and corrosion resistance than MAP
Water-soluble for easy aqueous formulation; compatible with other wood treatment chemicals
Certified for use in dry chemical extinguisher powders per BS EN 615 and UL 299 standards