Diammonium Phosphate DAP
| HS Code | 574283 |
| Name | Diammonium Phosphate (DAP) |
| Chemical Formula | (NH4)2HPO4 |
| Appearance | White or off - white granular solid |
| Molecular Weight | 132.06 g/mol |
| Solubility In Water | Soluble |
| Density | 1.619 g/cm³ |
| Melting Point | 155 °C (decomposes) |
| Ph Of Aqueous Solution | Around 7.5 - 8.5 |
| Main Nutrient Components | High in nitrogen (N) and phosphorus (P2O5), typically 18% N and 46% P2O5 |
| Role In Agriculture | A major fertilizer providing nitrogen and phosphorus for plant growth |
| Crystal Structure | Monoclinic |
| Odor | Odorless |
As an accredited Diammonium Phosphate DAP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Diammonium Phosphate DAP should be packaged in paper bags, lined with moisture-proof film, tied firmly with ropes, and the weight of each bag should be in accordance with market regulations to ensure tightness. |
| Storage | Diammonium Phosphate DAP should be stored in a dry and ventilated place, away from moisture and heat sources, and stacked in an orderly manner for easy access. |
| Shipping | Diammonium Phosphate DAP should be protected from the sun and rain, handled gently, and the packaging should not be damaged or leaked, and should be separated from other items. |
Competitive Diammonium Phosphate DAP prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615380400285 or mail to sales2@liwei-chem.com.
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Historical Development
The origin of Diammonium Phosphate DAP can be traced back to the exploration of agricultural fertilizers and the rise of chemical industry. In the past, farmers knew the importance of fertilizers to crop yields, but they suffered from the lack of good fertilizers. Later, as chemical knowledge became more abundant, scholars studied nitrogen and phosphorus compounds and explored their applications in agriculture. After a long period of time, countless craftsmen and researchers conducted repeated experiments, combined phosphoric acid with liquid ammonia, and gradually explored the preparation method of Diammonium Phosphate DAP. At first, the process was simple, the output was meager, and the product was impure. However, after continuous improvement of the raw material ratio and optimization of the reaction conditions, it has developed from simple workshop-style production to today's large-scale industrialized manufacturing, with mature technology and stable and reliable product quality, occupying an important position in both agriculture and industry.
Product Overview
Diammonium Phosphate DAP is a white crystalline powder or granule, odorless, and slightly salty. It is easily soluble in water, and its aqueous solution is weakly alkaline. It is rich in nitrogen and phosphorus, two essential elements for plant growth, and is a highly efficient compound fertilizer. In agricultural production, it can provide sufficient nutrition for crop growth, promote the development of root system, strong stems, plump fruits, and effectively improve the yield and quality of crops; in the industrial field, it also has many uses and is an important chemical product with both agricultural and industrial value.
Physical & Chemical Properties
In terms of physical properties, Diammonium Phosphate DAP has a high melting point, fine texture, regular crystal morphology, and low hygroscopicity. It has stable chemical properties and can undergo chemical reactions in acidic or alkaline environments to release or combine corresponding ions. When it encounters acid, it reacts to produce products such as monoammonium phosphate, and when it encounters metal salts, it can produce metal phosphate precipitation. After dissolving in water in the soil, it can ionize ammonium ions and phosphate ions, which can be absorbed and utilized by plant roots.
Technical Specifications & Labeling
Technical Specifications has strict requirements on various indicators of Diammonium Phosphate DAP. The main content (measured in (NH₄)₂HPO₄) must meet the specified standards, the nitrogen and phosphorus content must meet the specific ratio, the content of impurities such as chloride and heavy metals is strictly limited, and the moisture content and particle size are also clearly regulated. When labeling, clearly mark the full name of the product, specification model, manufacturer, production date, and implementation standard in a conspicuous place on the packaging, and clearly mark warning signs such as "moisture-proof" and "keep away from alkaline substances". At the same time, indicate the nitrogen and phosphorus nutrient content of the product to facilitate user identification and supervision.
Preparation Method
To prepare Diammonium Phosphate DAP, phosphoric acid and liquid ammonia are often used as raw materials. First, phosphoric acid and liquid ammonia are introduced into a special reactor in a precise proportion, and the two react with neutralization under suitable temperature and pressure conditions. During the reaction, the temperature change, pressure and reaction time must be accurately controlled to ensure that the reaction is sufficient and stable. After the reaction is completed, it will undergo a series of processes such as concentration, crystallization, filtration separation, and drying to finally obtain the finished product. The entire preparation process must be as delicate as a skilled craftsman carving jade, and every link is related to product quality.
Chemical Reactions & Modifications
After Diammonium Phosphate DAP dissolves in the soil, the ammonium ions and phosphate ions in it are gradually absorbed and utilized by the plant roots. When mixed with other chemicals, double decomposition reactions can occur to generate new compounds. It can be modified by adding specific additives or changing production process conditions, such as adjusting the release rate of nitrogen and phosphorus nutrients, enhancing anti-caking properties, and making it more suitable for different crops and different soils.
Synonyms & Product Names
Synonyms of Diammonium Phosphate DAP include diammonium hydrogen phosphate, etc. Although the names vary in different regions, industries or literature, they all refer to this substance.
Safety & Operational Standards
When using and operating Diammonium Phosphate DAP, operators must wear protective gloves, masks, goggles and other equipment to prevent the product from contacting the skin, splashing into the eyes or being inhaled into the body. If accidentally contaminated, rinse immediately with plenty of clean water and seek medical treatment if necessary. The storage and transportation process strictly follows the relevant regulations, the workplace is well ventilated, equipped with fire-fighting facilities, and fireworks are strictly prohibited to prevent accidents.
Application Area
Diammonium Phosphate DAP is widely used in the agricultural field. It can be deeply applied to the soil as a base fertilizer to provide long-term nutrition for crop growth; it can also be used as a topdressing fertilizer to quickly supplement nutrients during the critical period of crop growth; it can also be made into foliar fertilizer for spraying to enhance crop resistance. In industry, it can be used in the production of flame retardants to give materials fire resistance; in water treatment, it plays a certain purification role; it can also be used as a food additive to play a unique function, and its application prospects are very broad.
Research & Development
At present, the research and development of Diammonium Phosphate DAP continues to deepen. Researchers are committed to optimizing the preparation process, reducing production costs, reducing energy consumption and environmental pollution; developing new modified products to improve the utilization rate and durability of fertilizers; exploring its application potential in emerging fields such as new energy materials and biomedicine, hoping to expand its application range and increase product added value.
Toxicity Research
According to Toxicity Research, Diammonium Phosphate DAP is mildly toxic and does not cause any harm to humans or the environment when used normally, just like a breeze blowing against a willow tree. However, if taken in large quantities or exposed to high concentrations for a long time, it can also harm the human body, such as interfering with the body's acid-base balance and causing the body to become unbalanced. Therefore, when using this substance, safety rules must still be strictly followed and should not be neglected. Avoid excessive contact and prepare protective gear, such as wearing gloves and masks, to prevent accidental injury. This is not an over-concern, but a way to prevent problems before they happen.
Future Prospects
The future prospects of Diammonium Phosphate DAP are quite bright. With the acceleration of agricultural modernization, the demand for high-efficiency fertilizers continues to grow; technological innovations in the industrial field continue to emerge, and new application scenarios continue to emerge. In addition, with the continuous improvement and optimization of production processes, its output and quality will be further improved, and product performance will be continuously optimized. If it can achieve application breakthroughs in emerging fields, its market prospects will be broader and it is expected to play an important role in more fields.
Where to Buy Diammonium Phosphate DAP in China?
As a trusted Diammonium Phosphate DAP manufacturer, we deliver:
Factory-Direct Value: Competitive pricing with no middleman markups, tailored for bulk orders and project-scale requirements.
Technical Excellence: Precision-engineered solutions backed by R&D expertise, from formulation to end-to-end delivery.
Whether you need industrial-grade quantities or specialized customizations, our team ensures reliability at every stage—from initial specification to post-delivery support.
As a leading Diammonium Phosphate DAP supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
How is Diammonium Phosphate DAP made?
This product is made from phosphoric acid and ammonia. Put phosphoric acid in a refractory ceramic tank, and pass ammonia gas through a copper tube. The initial temperature is controlled at about 30 degrees. Stir while passing. When the pH value reaches about 7.0, the solution bubbles slowly and the gas is stopped. Move it into a copper evaporator and heat it with a slow fire until it is as thick as a paste. Pour it into a wooden tray to cool it. After it condenses into blocks, break it up and dry it with hot air to get Diammonium Phosphate DAP. The method is similar to boiling sugar. If the fire is too high, it will be burnt, and if it is not high enough, it will be thin. Only the precise ones are the best.
What is the shape of Diammonium Phosphate DAP?
It mostly appears as gray-white particles, the size of peas, solid and round, with little broken powder. It looks slightly shiny and has a delicate cross-section. It is hard and brittle, and it is easy to become fine powder when kneaded. It absorbs moisture well. It will clump after being placed in a wet place for three days, so it needs to be strictly avoided from moisture. It is easily soluble in water, and its aqueous solution is weakly alkaline with a pH value of about 8.0. It can chelate with metal ions. It releases a strong ammonia smell when it meets a strong base, so it cannot be stored with caustic soda. It is stable at high temperatures, and decomposes into phosphoric acid and ammonia when burned, so the place where it is stored needs to be ventilated.
Where can Diammonium Phosphate DAP be applied?
In agriculture, it is a high-concentration compound fertilizer rich in nitrogen and phosphorus. When applied to rice fields, it can promote tillering and strong stalks; when applied to fruit trees, it can make the fruit larger and more colorful, and increase the sweetness, especially suitable for neutral soil. In industry, it is an auxiliary material for flame retardants, added to coatings to enhance fire resistance; in water treatment, it can adjust the pH value and cause impurities to settle. In addition, in the fermentation industry, it is a nutrient for microorganisms to help them reproduce. Its use is like fertile soil, which can nurture all things and make them flourish.
How should Diammonium Phosphate DAP be stored?
It should be packed in double-layer thick plastic bags, the bag mouth should be heat-sealed and covered with woven bags. Store in a high dry warehouse, lay wooden boards and oil paper on the ground, so that the materials are one foot and five inches above the ground. The stack height should not exceed eight layers to prevent the bottom layer from being compressed and agglomerated. The warehouse should be equipped with calcium chloride moisture absorption tanks, and ventilated for two hours every day during the rainy season. Choose a sunny day for transportation, lay tarpaulin in the carriage, and stop to avoid rain. If it agglomerates, it can be placed on a stone mill to grind it into fine powder, but the fertilizer effect will not be reduced, but it is a little difficult to use. The way to store it is to use it quickly, and it is easy to absorb moisture when stored for a long time.
What is the difference between Diammonium Phosphate DAP and Monoammonium Phosphate MAP?
Although both are nitrogen-phosphorus compound fertilizers, their ammonia content and acidity and alkalinity are different. Diammonium Phosphate DAP contains high ammonia and its aqueous solution is alkaline; Monoammonium Phosphate MAP contains low ammonia and is acidic. In terms of use, the former is suitable for alkaline soil, and the latter is suitable for acidic soil. The methods of making are also different. The former is neutralized by ammonia, while the latter is acidic. Just like the two elements of cold and heat, they both govern the seasons, but their properties are different. Users should distinguish between them.
