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Diammonium phosphate

CAS Number
7783-28-0
EC Number
231-987-8
Chemical Formula
H3N.1/2H3O4P
Molecular Weight
132.06 g/mol

Description

Diammonium phosphate ( CAS 7783-28-0 ), commonly known as DAP, is an inorganic ammonium salt sourced for its dual function as a flame retardant and pH buffering agent across multiple industrial sectors. Secondary ammonium phosphate is a recognized alternative designation used in some procurement and regulatory contexts. Its ability to release ammonia and phosphoric acid under heat makes it effective in fire suppression. In agriculture, DAP is one of the most concentrated phosphorus-nitrogen fertilizers available, applied directly to soil or blended into NPK compound fertilizers to support crop nutrition programs. Textile and leather processors use it as a flame-retarding treatment for fabrics, paper, and hides, where it reduces flammability ratings to meet regulatory standards in various markets. In construction materials, DAP is incorporated into fireproofing formulations for wood, insulation boards, and coatings. It also functions as a fermentation nutrient and pH buffer in yeast-based processes. These industrial processes include bioethanol production and food manufacturing. DAP is supplied as white crystalline granules or powder to meet the specific handling requirements of global manufacturers. Standard commercial grades include technical grade for industrial flame retardant and fertilizer use, and food-grade material conforming to FCC specifications for permitted food processing applications. Bulk supply in bags or bulk containers is standard for agricultural and industrial volumes. This ensures efficient logistics and storage for large-scale operations requiring consistent chemical purity. Contact us for supply of Diammonium phosphate Request Quote

Other Names (Synonyms)

secondary ammonium phosphate | phosphoric acid, diammonium salt | hydrogen diammonium phosphate | diammonium orthophosphate | diammonium monohydrogen phosphate | diammonium hydrogen phosphate | diammonium hydrogen orthophosphate | diammonium acid phosphate | DAP

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point155 °C (decomp)
Density1.619 g/cm³
AppearanceAmmonium phosphate is a white crystalline or powdery substance.
ColorWhite
Odorwh. cryst. or powd., odorless, cooling salty taste
FormPowder
Water Solubility58 g/ 100mL (10 ºC)
Vapor Pressure0.076Pa at 20℃
pH7.6-8.2 (100g/l, H2O, 20℃)
Log P-2.148 (est)

Safety & Handling

Warning
GHS07· Irritant

Hazard Statements

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary Statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code31053000
UN Number3465
ADR Class6.1
Packing GroupIII
WGK (Germany)1