Diammonium Phosphate (DAP)

Both are important ammonium phosphate fertilizers, with the main difference being:

• Different Chemical FormulasDAP is (NH4)2HPO4 (Diammonium Phosphate), MAP is NH4H2PO4 (Monoammonium Phosphate)
• Varying Nitrogen ContentDAP contains N ≥ 21%, MAP contains N ≥ 12%; DAP has a higher nitrogen content.
• Different pH LevelsDAP aqueous solution is weakly alkaline (pH approx. 7.8-8.2), MAP aqueous solution is acidic (pH approx. 4.5-5)
• Nutrient ConcentrationDAP total nutrients (N+P₂O₅) ~74%, MAP ~73-75%.
• Application ScenariosDAP is more suitable as a base fertilizer and for situations requiring nitrogen supplementation; MAP is more suitable as a topdressing where phosphorus is the dominant nutrient.

The chemical properties of diammonium hydrogen phosphate determine its stability in air:

• Ammonia VolatilizationAmmonium ions (NH4+) in DAP gradually decompose in air, releasing ammonia and converting to ammonium dihydrogen phosphate.
• Storage MethodStore sealed in a cool, dry place, avoid contact with moist air
• Usage RecommendationsUse promptly after opening; reseal and store any unused product
• PrecautionsAvoid mixing with alkaline substances, as it accelerates ammonia volatilization.

Diammonium phosphate offers significant advantages as a flame retardant:

• High-Efficiency Flame RetardantDecomposes upon heating to produce ammonia and phosphoric acid, forming a protective layer that isolates oxygen
• Wide Application RangeCan be used for fireproofing treatment of various materials such as wood, paper, and fabrics
• Good compatibility with resinsCan be used as a flame-retardant coating additive, compatible with various resin systems
• Raw Material AdvantagesIt is a key raw material for producing high-polymerization-degree ammonium polyphosphate, which is an excellent flame retardant.

The main difference lies in impurity content standards and application fields:

• Impurity limitsFood-grade products have stricter requirements for impurities such as arsenic and heavy metals (e.g., As ≤ 0.0003%).
• Implementation standardFood grade complies with GB 30613-2014, industrial grade complies with HG/T4132-2010.
• Application AreasFood grade is used for food processing, pharmaceutical manufacturing, etc.; industrial grade is used for agriculture, fire retardant production, etc.
• PriceFood Grade is relatively more expensive due to higher purity requirements.

Our diammonium phosphate products support multiple packaging specifications.

• 25 kg/bagInner plastic liner, outer woven bag; suitable for small to medium batch purchases
• 50 kg/bagInner plastic liner, outer woven bag; suitable for general procurement needs
• 1000 kg/bag (ton bag)Suitable for bulk purchases; lower cost
• BulkSuitable for large-volume orders; contact sales for negotiation

Please contact our sales team for the minimum order quantity (MOQ); we will provide the most favorable solution based on your needs.

This product has been exported to multiple regions including Southeast Asia, the Middle East, Europe, and the Americas. Available export documents include:

• Commercial Invoice
• Packing List
• Certificate of Origin (CO/COO)
• Bill of Lading
• SDS/MSDS (Multilingual Version)
• Certificate of Analysis (COA)
• For food-grade requirements, food-grade certification documents can be provided