Magnesium Dihydrogen Phosphate
Magnesium Dihydrogen Phosphate is the acidic magnesium salt of orthophosphoric acid, with formula Mg(H₂PO₄)₂ and CAS number 13092-66-5.
The compound supplies both magnesium and phosphorus in a soluble, low-pH form. It occupies a niche position in mineral fortification, dental chemistry, and specialty fertilizer applications, where the acidic character is either desired or is balanced against an alkaline co-ingredient.
We source bulk Magnesium Dihydrogen Phosphate from top China manufacturers for our partners. The manufacturer is in Jiangsu. A smaller requirement can ship in a combined container with other ingredients.
Please send the grade you need, the volume and your destination port, and we will come back with a solution and a price.
or call +86-21-6858 0751
- Packaging
- 25 kg kraft paper bag with PE inner liner
- ISO 9001
- HACCP
- Halal
- Kosher
Specifications
| Item | Specification |
|---|---|
| Appearance | White crystalline powder |
| Assay (Mg(H₂PO₄)₂) | ≥ 96.0% |
| MgO Content | 15–17% |
| P₂O₅ Content | ≥ 58.0% |
| Loss on Drying | ≤ 15.0% |
| pH (1% solution) | 3.0–4.5 |
| Water Insoluble | ≤ 0.5% |
| Fluoride (F) | ≤ 10 mg/kg |
| Heavy Metals (as Pb) | ≤ 10 mg/kg |
| Lead (as Pb) | ≤ 4 mg/kg |
| Arsenic (as As) | ≤ 3 mg/kg |
Common Markets Grades
Commercial supply is split between technical and food-grade specifications.
The technical grade is a coarse crystalline or granular powder for industrial use, including ceramic binders and specialty fertilizer blends. Purity typically runs above 97 percent on a dry basis.
Food and pharmaceutical grades are fine white powders meeting Food Chemicals Codex limits for arsenic, fluoride, lead, and other heavy metals. The anhydrous form is most common in dry blends, while the dihydrate appears in solution-based applications.
A spray-dried, low-density grade is produced for direct-compression tablet manufacture, where the acidic salt contributes both buffering and mineral content.
Applications
- Mineral fortification of specialty beverages where both magnesium and phosphorus are targeted
- Effervescent tablet and powder formulas, contributing acidity to the carbonate-acid couple
- Buffering agent in fermentation media for industrial enzyme and yeast production
- Component in specialty fertilizer blends for foliar feeding and hydroponic systems
- Dental cements and orthodontic materials, providing magnesium phosphate matrix chemistry
- Ceramic and refractory binders for high-temperature applications
- pH-control reagent in analytical and biochemical laboratory work
- Specialty animal-feed premixes for ruminant and aquaculture nutrition
China Manufacturers of Magnesium Dihydrogen Phosphate
Top Magnesium Dihydrogen Phosphate manufacturers in China.
Company names and logos are the property of the manufacturers themselves. They are listed here because our own directory records them as producing this ingredient. A listing is not an endorsement by them, and we do not represent them or speak on their behalf.
How We Help Source Magnesium Dihydrogen Phosphate
Direct Factory Sourcing
We run the whole process: selecting the manufacturer from the top Chinese food ingredient producers, negotiating the price, verifying quality, and coordinating the logistics. You deal with us instead of with several factories at once.
Original Packaging and Documents from the Manufacturer
The manufacturer sends your Magnesium Dihydrogen Phosphate out of its own factory in the original packing, through to your destination port. The COA, COO, MSDS, TDS and any certifications reach you from the manufacturer as well.
Free Samples and Lead Time
We send 100 to 500 g free for your own laboratory to test and you cover only the courier, usually within 2 to 3 working days. ETD is usually within 7 to 15 days once the order is confirmed, and we check that date against the factory's own manufacturing schedule before we give it to you.
Combined Shipment
We can load Magnesium Dihydrogen Phosphate together with other ingredients such as Sodium Acetate, Calcium Citrate and Sodium Lactate into one 20' FCL. If your quantity is small, we can also ship LCL.
Regulatory Status
Magnesium Dihydrogen Phosphate is permitted as a food additive in most regulated markets.
In the European Union it falls under the E450-E452 family of phosphates as part of E343 magnesium phosphates, specifically E343i for the monobasic form. Regulation (EC) No 1333/2008 governs use and sets maximum levels in defined food categories.
The United States Food and Drug Administration permits magnesium phosphates including the monobasic form under 21 CFR 184.1434 as a GRAS substance, with self-limiting use levels in standardised foods.
Food Chemicals Codex monographs cover identity, assay, and impurity limits. The compound also appears in the European Pharmacopoeia for pharmaceutical-grade specifications.
Manufacturing Process
Industrial synthesis is a straightforward acid-base reaction.
Magnesium oxide, magnesium hydroxide, or magnesium carbonate is reacted with food-grade or technical-grade phosphoric acid in a controlled molar ratio. For the dihydrogen salt, two moles of phosphoric acid react with one mole of the magnesium source.
Temperature is held in the 40 to 70 degrees Celsius range to prevent premature dehydration and to avoid forming the dibasic or tribasic phosphate. Continuous stirring and slow acid addition allow the reaction to reach completion without local overheating.
The resulting solution is concentrated by evaporation, then crystallised under controlled cooling to yield the anhydrous or hydrated salt as required. The crystals are centrifuged, washed, and dried in fluid-bed or rotary dryers.
Major producers include Prayon in Belgium, Innophos in the United States, and several Chinese phosphate specialists. Output is modest relative to the dibasic and tribasic phosphate grades, reflecting the narrower application set.
