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Chemical properties Uses Content analysis Toxicity Usage limit Production method Hazards & Safety Information
Ammonium phosphate dibasic
Ammonium phosphate dibasic structure
Chemical Name:
Ammonium phosphate dibasic
DAP;pelor;FYREX;ASPEP;DNPEP;diammonium;phos-chek202;phos-chek259;Ammonium phosphates;DIAMMONIUM PHOSPHATE
Molecular Formula:
Formula Weight:
MOL File:

Ammonium phosphate dibasic Properties

Melting point:
155 °C (dec.)(lit.)
1.203 g/mL at 25 °C
storage temp. 
Store at RT.
H2O: 1 M at 20 °C, clear, colorless
Specific Gravity
7.6-8.2 (100g/l, H2O, 20℃)
Water Solubility 
58 g/ 100mL (10 ºC)
λ: 260 nm Amax: 0.065
λ: 280 nm Amax: 0.065
Stable. Incompatible with strong acids, strong bases, strong oxidizing agents.
CAS DataBase Reference
7783-28-0(CAS DataBase Reference)
EWG's Food Scores
EPA Substance Registry System
Diammonium phosphate (7783-28-0)
  • Risk and Safety Statements
Signal word  Warning
Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  Xi,Xn,N
Risk Statements  36/37/38-20/21/22-50
Safety Statements  26-36-61-37/39
RIDADR  UN 3465 6.1 / PGIII
WGK Germany  1
HS Code  31053000
Toxicity LD50 orally in Rabbit: 6500 mg/kg LD50 dermal Rabbit > 7950 mg/kg

Ammonium phosphate dibasic price More Price(25)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 09839 Ammonium phosphate dibasic BioUltra, ≥99.0% (T) 7783-28-0 50g $32.9 2019-12-02 Buy
Sigma-Aldrich 09839 Ammonium phosphate dibasic BioUltra, ≥99.0% (T) 7783-28-0 1kg $94.5 2019-12-02 Buy
Alfa Aesar 010301 Ammonium hydrogen phosphate, tech., P2O5 53% min 7783-28-0 1kg $89.3 2019-12-02 Buy
Alfa Aesar 010301 Ammonium hydrogen phosphate, tech., P2O5 53% min 7783-28-0 5kg $162 2019-12-02 Buy
Strem Chemicals 93-0220 Ammonium hydrogen phosphate, 98+% (ACS) 7783-28-0 250g $40 2019-12-02 Buy

Ammonium phosphate dibasic Chemical Properties,Uses,Production

Chemical properties

It appears as colorless transparent monoclinic crystal or white powder, being soluble in water, insoluble in alcohol, acetone and ammonia.


(1) Diammonium phosphate is industrially used as feed additives, flame retardants and the ingredients of the fire extinguishing agent.
(2) It can be used as analysis reagents and buffer
(3) It is a widely applicable efficient fertilizer for vegetables, fruits, rice and wheat.
(4) It can be used as water softeners; yeast foodstuffs, and so on.
(5) In the food industry, it can be used as food leavening agent, dough regulator, yeast food, brewing fermentation additives as well as being used as a buffer.
(6) It can be used as ruminant feed additives.
(7) It can be used for printing plate, medicine, fire prevention, electronic tubes.
(8) Fertilizer level is mainly used for high concentrations nitrogen and phosphorus compound fertilizer. The industrial grade can be used for impregnation of wood and fabric to increase its durability; it can be used as dry powder fire extinguishing agent, fluorescent phosphor; also used for the manufacturing of printing plate, tube, ceramic and china, wastewater biochemical treatment; military use it as the flame retardants of rocket engine motor insulation materials.

Content analysis

Accurately weigh about 600 g to dissolve in 40 ml of water with 0.1mol/L sulfuric acid titration to pH value of 4.6. Each mL of 0.1 mol/L sulfuric acid corresponds to 13.21 mg of diammonium hydrogen phosphate [(NH4) 2HPO4].


ADI 0 to 70 mg/kg (calculated as phosphorus, FAO/WHO, 1985). It is generally recognized as being safe (US Food and Drug Administration, 1985).
ADI 0 to 70 mg/kg (total phosphate amount as calculated by phosphorus, FA0/WHO, 2001);
GRAS: (FDA, § 184.1141b, 2000).

Usage limit

GB 2760-96: meat products, l g/kg; fruit and vegetable peeling, GMP.
US BATF (27CFR §240.1051,2000): in the wine production, it is used as yeast nutrients, 0.17%; sparkling wine products in the content of ≤ 0.8%.
GB 2760-96 provides it as allowable food processing aids; take GMP as limited.

Production method

(1) The production of diammonium phosphate by the reaction of hot phosphoric acid and liquid ammonia or extraction of phosphoric acid and liquid ammonia is the major method of industrial production. The former has high purity and the process is simple. The latter utilizes wet extraction of phosphoric acid with low cost.
In the hot phosphoric acid neutralization liquid ammonium method (water: phosphoric acid = 1.3: 1) into dilute phosphoric acid. After metering, it is added into the enamel reaction tank with stirring and jacket. Under stirring, the ammonia gas is passed through the round tube ammonium distributor for neutralization reaction. Upon being neutralized until the reaction liquid Ph is between 8 and 9, filtered when it is hot, and then sent to the cooling crystallizer. After cooling and crystallization, the mother liquor is separated by centrifugation and then dried to obtain diammonium phosphate products. Its reaction equation:
H3PO4 + 2NH3 → (NH4) 2HPO4
The centrifuge separated mother liquor is sent into the separator for addition of ammonium sulfide in order to remove the iron. After filtering, the filtrate is concentrated, sent to the fine tuning tank, pass ammonia fine for tuning Ph to 8~9 and return to the cooling mold.
Phosphoric acid extraction and liquid ammonia neutralization method: adding a certain amount of hydrogen peroxide to oxidize the ferrous iron in the phosphoric acid solution. Send the phosphoric acid into the tubular reactor for neutralization with ammonia with the second reaction to making Ph of about 8.0. After the filtering by the frame filter, the filtrate is sent into the fine tuning tank to adjust Ph to 7.8~8 and sent into the evaporator to reach a relative density of 1.3, return back into the cooling mold. The cooled crystallization liquid further undergoes centrifugal separation and drying to obtain the finished product of diammonium hydrogen phosphate. Its reaction is:
H3PO4 + 2NH3 → (NH4) 2HPO4
The filtered residue is rinsed with water, and the lotion and the mother liquor are combined and sent to the storage tank of reaction liquid for acid regulation with the impurity being removed by filtration and recycled.
The washed residue, after drying, contains 35% phosphorus pentoxide and 5% ammonia, being a high-efficacy compound fertilizer.
(2) For the production of feed-purpose diammonium phosphate using wet phosphate as raw material, the production process demands a two-step defluorination, three-step amination and thermal decomposition with triammonium phosphate for obtaining the feed-purpose diammonium phosphate. Its production cost is lower than the method using yellow phosphorus as raw material.
Wet phosphoric acid method: send the extracted phosphate acid containing 20%~30% P2O5, 1.2%~2% F into the reaction device through the gas purification system, after three-step amination for make impurities form a precipitate that is easily removed by filtering. The precipitate is further separated through the filter press. The filtrate is a diammonium phosphate solution containing P2O5 <15%, F0.4%, SO42-2.5%~3% and about 1% of solid suspension. In order to further remove the dissolved impurities and part of the solid suspension, the filtrate is sent to another reaction device for sending ammonia to saturation, and then put into the cooling crystallization device for cooling crystallization, leading to the formation of triammonium phosphate crystals. The crystal is separated from the mother liquor through a conical settling tank, and then is dehydrated by centrifugation, and the crystal is put into a boiling furnace and pyrolyzed into diammonium hydrogen phosphate, and dried to obtain diammonium phosphate dihydrate product for feed, the reaction equation is as follows:
H3PO4 + 2NH3 → (NH4) 2HPO4
(NH4) 2HPO4 + NH4OH → (NH) 43PO4 + H2O
(NH4) 3HPO4? 3H2O [70C]. (NH4) 2HPO4 + NH3 + 3H2O
The gas mixture containing ammonium dihydrogen phosphate dust and ammonia gas is subjecting to dust removal through cyclone separator, and then subject to wet phosphoric acid spray absorption in the scrubber.
(3) To the ammonium dihydrogen phosphate solution, slowly add concentrated ammonia to neutralize the reaction until pH 14 to obtain the triammonium phosphate solution, and then subject to cooling, crystallization, centrifugal separation and drying to obtain the final product.

Hazards & Safety Information

Category Toxic substances
Toxic classification poisoning
Acute toxicity Reference: Oral-Rat LD50: 17000 mg/kg; Abdominal-rat LDL0: 1000 mg/kg
Flammability and Hazardous properties upon heating, it can produce toxic nitrogen oxides, phosphorous oxides, and ammonia fumes
Storage and transportation characteristics warehouse: Ventilated, Low temperature and dry
Fire extinguishing agent dry powder, foam, sand, carbon dioxide, mist water

Chemical Properties

white crystalline powder

Chemical Properties

Ammonium phosphate is a white crystalline or powdery substance.


Fireproofing textiles, paper, wood, and vegetable fibers; impregnating lamp wicks; preventing afterglow in matches; flux for soldering tin, copper, brass, and zinc; purifying sugar; in yeast cultures; in dentifrices; in corrosion inhibitors; in fertilizers.


Ammonium Phosphate Dibasic is a general purpose food additive that is readily soluble in water, with approximately 57 g dissolving in 100 g of water at 0°c. a 1% solution has a ph of 7.6–8.2. it is used as a dough strengthener, firming agent, leavening agent, and ph control agent. its uses include baked goods, alcoholic beverages, condiments, and puddings. in bakery products, up to 0.25 part per 100 parts by weight of flour is used.


ChEBI: An inorganic phosphate, being the diammonium salt of phosphoric acid.

Agricultural Uses

With excess ammonia, the technical grade of diammonium phosphate (DAP) contains 16 to 18% nitrogen and 20to 21 % phosphorus.
DAP is an important fertilizer as well as an intermediate in the production of complex fertilizers and bulk blends.

Contact allergens

A flame retardant caused contact dermatitis in surgical personnel. It was due to excessive residual concentrations in surgical garbs.

Safety Profile

Low to moderate toxicity. See also PHOSPHATES. When heated to decomposition it emits very toxic fumes of POx, NOx, and NH3.

Potential Exposure

Used in fireproofing of textiles; wood and paper; in soldering flux; as a fertilizer; a buffer; in baking powder and food additives.


There are no DOT/UN listed requirements.

Purification Methods

Crystallise it from water (1mL/g) between 70o and 0o. Its solubility in H2O is 59% at room temperature and 200% at the boiling point. It slowly evolves NH3 and should be stored in a well-stoppered container. After one crystallisation, ACS grade salt had Fe, Mo, Na, Se and Ti at 1, 0.2, 1.4, 0.2 and 0.8ppm, respectively. [Gmelin’s, Ammonium (8th edn) 23 pp422-426 1936.]


Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Contact with air causes this chemical to produce anhydrous ammonia fumes.

Waste Disposal

May be flushed to sewer with huge volumes of water.

Ammonium phosphate dibasic Preparation Products And Raw materials

Raw materials

Preparation Products

Ammonium phosphate dibasic Suppliers

Global( 384)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Jiangsu Kolod Food Ingredients Co.,Ltd.
+86-518-85110578 18805133257
+86-518-85110578 [email protected] CHINA 100 60
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0371-55170693 [email protected] CHINA 22631 55
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86-0551-65418684 18949823763
86-0551-65418684 [email protected] China 1892 55
Hebei Chisure Biotechnology Co., Ltd.
0311 66567340 [email protected] CHINA 1012 58
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career henan chemical co
[email protected] CHINA 30054 58
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Hebei Guanlang Biotechnology Co., Ltd.
whatsapp: +8619930501651 [email protected] CHINA 2370 58

View Lastest Price from Ammonium phosphate dibasic manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-07-03 Diammonium phosphate
US $10.00 / KG 1KG 99% 10 mt Hebei Guanlang Biotechnology Co., Ltd.
2019-04-24 Diammonium phosphate
US $1.00 / kg 1kg 99% 200tons hdzhl biotechnology co., ltd
US $1.00 / kg 1kg 99% 100KG career henan chemical co

Ammonium phosphate dibasic Spectrum

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