Monoammonium Phosphate MAP
| HS Code | 112108 |
| Chemical Formula | NH4H2PO4 |
| Molar Mass | 115.03 g/mol |
| Appearance | White crystalline solid |
| Solubility In Water | Soluble |
| Density | 1.803 g/cm³ |
| Melting Point | 190 °C |
| Ph Of Aqueous Solution | 4.4 - 4.8 |
| Pka1 | 2.12 |
| Pka2 | 7.21 |
| Main Use | Fertilizer production |
As an accredited Monoammonium Phosphate MAP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Monoammonium Phosphate MAP is packed in paper bags, covered with moisture-proof film, and sealed with ropes. The amount of each bag should be in accordance with the usual amount for easy handling. |
| Storage | Monoammonium Phosphate MAP should be stored in a dry and ventilated warehouse, away from moisture and high temperature, neatly stacked and with gaps. |
| Shipping | Monoammonium Phosphate MAP 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 Monoammonium Phosphate MAP 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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Tel: +8615380400285
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Historical Development
The origin of Monoammonium Phosphate MAP can be traced back to the beginning of the integration of agriculture and chemical industry. In the past, farmers knew the key to fertilizing the fields, and scholars explored the wonders of phosphorus and nitrogen. The two complemented each other and gradually developed the method of MAP preparation. At first, the process was simple and the output was scarce. After countless craftsmen and researchers worked hard to improve the raw material ratio and optimize the reaction conditions, it has developed from simple workshop production to large-scale industrial manufacturing today. The process is mature and the product quality is stable. It is widely used in agriculture and industry.
Product Overview
Monoammonium Phosphate MAP is a white crystalline powder or granule, odorless, and slightly sour. It is easily soluble in water, and its aqueous solution is rich in nitrogen and phosphorus, two nutrients necessary for plant growth. In agriculture, it is a high-quality and efficient fertilizer; in industry, it also has many uses, such as flame retardant, fermentation aid, etc. It is an important chemical with both agricultural and industrial value.
Physical & Chemical Properties
In terms of physical properties, Monoammonium Phosphate MAP has a high melting point, fine texture, low hygroscopicity, and regular crystal morphology. It has stable chemical properties and can react chemically in acidic or alkaline environments to release or combine corresponding ions. When it encounters alkali, it reacts to produce products such as diammonium phosphate, and when it encounters metal salts, it can produce metal phosphate precipitation.
Technical Specifications & Labeling
Technical Specifications has clear standards for the nitrogen and phosphorus content, moisture content, particle size and other indicators of Monoammonium Phosphate MAP. When labeling, the product name, specifications, nutrient content, manufacturer, production date, shelf life, and implementation standards are clearly marked in a conspicuous place on the package, and warning information such as "moisture-proof" and "keep away from alkaline substances" are marked to facilitate use and supervision.
Preparation Method
Monoammonium Phosphate MAP is usually prepared with phosphoric acid and liquid ammonia as raw materials. Phosphoric acid and liquid ammonia are introduced into the reactor in a precise proportion and neutralized at a suitable temperature and pressure. After the reaction, the finished product is obtained through concentration, crystallization, drying and other processes. The whole process requires precise control of the raw material ratio, reaction temperature, pressure and time. Any slight deviation will affect the product quality.
Chemical Reactions & Modifications
Monoammonium Phosphate MAP dissolves in water in the soil, ionizes ammonium ions and phosphate ions, and is absorbed and utilized by plant roots. When mixed with other chemical substances, double decomposition reactions can occur to generate new compounds. It can be modified by adding additives or changing the production process, such as improving fertilizer efficiency and solubility, to meet the needs of different crops and soils.
Synonyms & Product Names
Synonyms of Monoammonium Phosphate MAP include monoammonium 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 Monoammonium Phosphate MAP, operators must wear protective gloves, masks and other equipment to avoid contact between the product and the skin and eyes. If contact is accidental, rinse immediately with plenty of water. Storage and transportation must comply with relevant regulations, and the workplace must be well ventilated and equipped with fire-fighting facilities to prevent accidents.
Application Area
In the agricultural field, Monoammonium Phosphate MAP is used as a base fertilizer and topdressing fertilizer to provide nitrogen and phosphorus nutrients for various crops, promote crop growth, enhance stress resistance, and increase yield; in the industrial field, it is used for flame retardant treatment of wood, paper, and fabrics, and as a nutrient in the fermentation industry, it has broad application prospects.
Research & Development
At present, the research and development of Monoammonium Phosphate MAP continues to deepen. Researchers are committed to optimizing production processes, reducing energy consumption, and reducing environmental pollution; developing new modified products to improve fertilizer utilization; exploring its application possibilities in emerging fields such as new energy and biomedicine, and expanding the application boundaries of products.
Toxicity Research
Toxicity Research shows that Monoammonium Phosphate MAP has low toxicity and is less harmful to humans and the environment when used normally. However, large amounts of intake or long-term exposure to high-concentration products may affect human health. Safety regulations must still be followed when using them to avoid excessive exposure.
Future Prospects
The Future Prospects of Monoammonium Phosphate MAP are bright. The process of agricultural modernization is accelerating, and the demand for high-efficiency fertilizers is increasing; industrial technology innovation is continuous, and new application areas are gradually expanding. In addition, with the continuous improvement of production processes, its output and quality will be further improved, and product performance will be continuously optimized. It is expected to play an important role in more fields, and the market prospects are extremely promising.
Where to Buy Monoammonium Phosphate MAP in China?
As a trusted Monoammonium Phosphate MAP 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 Monoammonium Phosphate MAP supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What raw materials are used to make Monoammonium Phosphate MAP?
This product is mostly made of phosphoric acid and ammonia as raw materials, and is made through a neutralization reaction. Put phosphoric acid in a stone reaction tank, and introduce ammonia gas through a bamboo tube. Slowly introduce it at first, wait until the solution is slightly warm, speed up the ventilation speed, and stir with a wooden paddle while passing it to make the two fully dissolve. When the pH value is about 4.5, stop the gas, and the solution is as thick as honey. Move it into a copper plate for evaporation until a crust forms on the surface, scrape it into a wooden mold for cooling, and break it into blocks after solidification. Dry it in the sun to get Monoammonium Phosphate MAP. Its method is similar to brewing vinegar. If there is too much ammonia, it will taste fishy, and if there is too much phosphoric acid, it will taste sour. Only the one with a neutral taste is pure.
What is the shape and properties of Monoammonium Phosphate MAP?
It mostly appears as white crystals or granules, the size of corn, solid and shiny, with little broken powder. It looks crystal clear, and the cross section is fine and free of impurities. It is brittle and easy to grind, and it feels smooth when twisted. It is soluble in water, and its aqueous solution is acidic with a pH value of about 4.0. It can bind with metal ions. It is less hygroscopic than DAP. It will not clump if placed in a dry place for more than a month, but it will still deliquesce in wetlands. It releases ammonia gas when it meets strong alkali, so it cannot be stored with lime. It is stable at high temperature, and decomposes into phosphoric acid and ammonia when burned, so it needs to be stored away from fire sources.
Where can Monoammonium Phosphate MAP be applied?
In agriculture, it is the best compound fertilizer, containing nitrogen and phosphorus. When applied to dryland crops such as corn and cotton, it can promote the development of root systems and plump grains; when applied to acidic soil, it can also adjust the pH. In industry, it is an essential fire extinguishing agent. When it encounters fire, it decomposes and absorbs heat to prevent the spread of fire, especially suitable for oil fires. In the food industry, it can be used as a leavening agent and added to baked goods to make them crispy; in feed, it is a nutritional enhancer to supplement phosphorus and nitrogen in livestock and poultry. Its use is like sweet rain, moistening everything and helping it grow.
How should Monoammonium Phosphate MAP be stored?
It should be packed in thick plastic bags, 50 kilograms per bag, tightly tied, and covered with woven bags. Store in a dry warehouse, with wooden boards on the floor and oil paper on the boards to keep the materials one foot above the ground. The stack height should not exceed ten layers to prevent the bottom layer from being compressed and agglomerated. Lime jars should be placed in the warehouse to absorb moisture, and ventilation should be carried out three times a week during the rainy season. Transport on sunny days, cover the carriage with tarpaulins, and stop to avoid rain. If agglomerates, they can be crushed in a stone mortar, and the effectiveness will not be reduced, but impurities must be prevented from mixing in. The key to storage is to prevent moisture and humidity, and long-term storage will not damage its properties.
What is the difference between Monoammonium Phosphate MAP and Diammonium Phosphate DAP?
Although both contain nitrogen and phosphorus, the ammonia content and pH value are different. Monoammonium Phosphate MAP contains less ammonia, and its aqueous solution is acidic; Diammonium Phosphate DAP contains more ammonia, and its aqueous solution is alkaline. In terms of use, the former is suitable for acidic soil, while the latter is suitable for neutral or alkaline soil. The production methods are also different. The former reacts until it becomes acidic, while the latter reacts until it becomes weakly alkaline. For example, sweet and sour fruits are both nourishing, but their properties are different, and those who eat them should choose the one that suits them best.
