Diammonium Phosphate (Flame Retardant Grade)

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

CAS Number: 7783-28-0

Diammonium phosphate (DAP) flame retardant grade is an inorganic phosphorus-nitrogen salt widely used in fire-retardant treatments for wood, paper, and agricultural biomass. Its higher nitrogen content and alkaline decomposition characteristics complement monobasic ammonium phosphate in blended fire-retardant formulations. DAP releases ammonia and phosphoric acid upon heating, forming a phosphate ester char layer that retards pyrolysis and reduces flame spread.

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Technical Specifications

appearance	White crystalline powder or granules
purity (%)	≥98
moisture (%)	≤0.5
pH (1% solution)	7.5–8.5
nitrogen content (%)	21.2
phosphorus content (%)	23.5

Applications

Wood and lumber fire-retardant pressure impregnation
Cellulosic insulation material flame retardant treatment
Paper and textile fire-retardant aqueous finishing
Blended IFR coatings as combined acid source and blowing agent
Forestry and wildfire suppression aerial retardant formulations

Key Features

Higher nitrogen content versus MAP provides enhanced gas-phase flame inhibition through ammonia release
Alkaline pH enables compatibility with amine-cured systems and wood preservative co-treatments
Fully water-soluble for easy incorporation into aqueous fire-retardant treatment solutions
Low-cost commodity inorganic FR with well-established fire-retardant efficacy on cellulosic substrates