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Technical specifications
Basic Information
| Project | Parameters |
|---|---|
| Product Name | Diammonium phosphate |
| English name | Diammonium Phosphate (DAP) |
| CAS No. | 7783-28-0 |
| Chemical Formula | (NH4)2HPO4 |
| Molecular weight | 132.0 |
| Appearance | White Granular Crystal |
| Relative density | 1.619 |
| Melting Point | 155℃ |
Physical and chemical properties
| Project | Description |
|---|---|
| Appearance | White Granular Crystal |
| Water soluble | Easily soluble in water |
| Alcohol Solubility | Insoluble in Alcohol |
| Chemical stability | Gradually loses ammonia in air to form monoammonium phosphate |
| Relative density | 1.619 |
| Melting Point | 155℃ |
| pH (1% aqueous solution) | 7.6 — 8.2 |
Technical specifications — industrial grade (HG/T4132-2010)
| Serial Number | Indicator name | Requirements |
|---|---|---|
| 1 | Primary content ((NH₄)₂HPO₄) % ≥ | 99 |
| 2 | P2O5 % ≥ | 53 |
| 3 | Nitrogen (N) % ≥ | 21 |
| 4 | pH of 1% aqueous solution | 7.8 — 8.2 |
| 5 | Water-insoluble residue, % ≤ | 0.1 |
| 6 | Moisture (H2O) % ≤ | 0.2 |
| 7 | Heavy Metals (as Pb), % ≤ | 0.005 |
| 8 | Arsenic (as As) % ≤ | 0.005 |
Technical specifications — food grade (GB 30613-2014)
| Serial Number | Indicator name | Requirements |
|---|---|---|
| 1 | Primary content ((NH₄)₂HPO₄) % ≥ | 99 |
| 2 | P2O5 % ≥ | 53 |
| 3 | Nitrogen (N) % ≥ | 21 |
| 4 | pH of 1% aqueous solution | 7.6 — 8.2 |
| 5 | Water-insoluble residue, % ≤ | 0.1 |
| 6 | Moisture (H2O) % ≤ | 0.2 |
| 7 | Fluorides (as F) % ≤ | 0.001 |
| 8 | Heavy Metals (as Pb), % ≤ | 0.001 |
| 9 | Arsenic (as As) % ≤ | 0.0003 |
Packaging and Storage
| Project | Description |
|---|---|
| Packaging method | Inner plastic, outer woven bag |
| Packaging Specification | 25 kg/bag, 50 kg/bag, 1000 kg/bag (big bag). |
| Storage Conditions | Store in a dry, well-ventilated place |
| Important Notes | Store in a dry place, avoid contact with alkaline substances |
Product description
Product overview
Diammonium phosphate (DAP), chemical formula (NH4)2HPO4, CAS 7783-28-0, molecular weight 132.0. It is an important inorganic chemical raw material and a high-concentration binary compound fertilizer (NP). The product is white granular crystals, relative density 1.619, melting point 155°C, easily soluble in water, insoluble in alcohol. Gradually loses ammonia in air, forming monoammonium phosphate.
Key Advantages
- High concentration of nutrientsP₂O₅ ≥53%, N ≥21%, total nutrient content reaches 74%, making it a high-quality raw material for preparing high-concentration compound fertilizers.
- Chlorine-Free FertilizerDoes not contain chloride ions, suitable for chlorine-sensitive crops (e.g., tobacco, potato, etc.)
- Available in two versionsTwo specifications are available: industrial grade (HG/T4132-2010) and food grade (GB 30613-2014).
- Excellent physical propertiesWhite granulated crystals, good flowability, not prone to caking
- Fully water solubleEasily soluble in water, dissolves quickly, suitable for various irrigation systems.
- Wide ApplicationUsed in agriculture, industry, food, and pharmaceutical sectors.
Comparison of Product Advantages
| Characteristics | Description | Area of application |
|---|---|---|
| High concentration N+P | Total nutrient content 74%, N≥21%+P₂O₅≥53% | Preparation of high-concentration compound fertilizers, agricultural application |
| Chlorine-Free Formula | Free of chloride ions, safe for crops | Chlorine-sensitive crops: tobacco, potato, etc. |
| Neutral pH | pH 7.6–8.2, safe for soil | Suitable for Various Soil Types |
| Two options | Industrial/food grade available | Different applications: agriculture, industry, food sector |
Area of application
Agricultural Production
Flame retardant
Food industry
Pharmaceutical fermentation
Frequently Asked Questions
Both are important phosphorus-ammonium fertilizers; the main differences are as follows:
- Various chemical formulasDAP is (NH4)2HPO4 (diammonium phosphate), MAP is NH4H2PO4 (monoammonium phosphate)
- Various nitrogen contentsDAP contains N≥21%, MAP contains N≥12%, nitrogen content in DAP is higher
- Various pH valuesDAP aqueous solution has a slightly alkaline reaction (pH approx. 7.8-8.2), MAP aqueous solution is acidic (pH approx. 4.5-5).
- Nutrient ConcentrationTotal nutrient content (N+P₂O₅) in DAP is about 74%, in MAP about 73-75%.
- Area of applicationDAP is more suitable as a basal fertilizer and for situations requiring supplemental nitrogen; MAP is more suitable as a top dressing with phosphorus dominance.
The chemical properties of diammonium phosphate determine its stability in air:
- Ammonia EmissionAmmonium ions (NH₄⁺) in DAP gradually decompose in air releasing ammonia, converting to monoammonium phosphate.
- Storage methodStore in sealed packaging in a cool, dry place; avoid contact with moist air.
- Application recommendationsAfter opening the package, use as soon as possible; unused product must be sealed tightly.
- Important NotesAvoid storage together with alkaline substances, as this accelerates ammonia evaporation
Diammonium phosphate has significant advantages as a flame retardant:
- High-efficiency flame retardantWhen heated, it decomposes releasing ammonia and phosphoric acid, forming a protective layer that isolates oxygen.
- Broad spectrum of applicationCan be used for flame retardant treatment of various materials such as wood, paper, and textiles.
- Good compatibility with resinsCan be used as an additive in fire retardant coatings, compatible with various resin systems.
- Raw Material AdvantagesIt is an important raw material for the production of high-polymerization ammonium polyphosphate, which is an excellent flame retardant.
The main difference lies in impurity content standards and application areas:
- Impurity limitsFood grade imposes stricter requirements on impurities such as arsenic, heavy metals (e.g., As≤0.0003%).
- Execution StandardFood grade conforms to GB 30613-2014, industrial grade conforms to HG/T4132-2010.
- Field of ApplicationFood grade is used in food processing, pharmaceutical production, etc.; technical grade is used in agriculture, flame retardant production, etc.
- PriceFood grade is more expensive due to higher purity requirements
Our diammonium phosphate is available in various packaging options:
- 25 kg/bagInner plastic packaging, outer fabric bag, suitable for small and medium wholesale purchases.
- 50 kg/bagInner plastic packaging, outer woven bag, suitable for regular purchases.
- 1000 kg/bag (big bag)Suitable for large-volume wholesale purchases, lower cost
- BulkSuitable for very large orders; contact the commercial department for discussion.
Minimum Order Quantity: please consult our commercial team; we will offer the most favorable terms according to your needs.
This product is already exported to Southeast Asia, the Middle East, Europe, the Americas, and other regions. Provided export documents include:
- Commercial Invoice
- Packing List
- Certificate of Origin (CO/COO)
- Bill of Lading
- SDS/MSDS (Multilingual Version)
- Certificate of Analysis (COA)
- If food-grade quality is required, relevant certificates can be provided.
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