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UNITED INDUSTRY CO., LTD. is the largest producer of magnesium sulfate in China, operating since 1989 in Laizhou, Shandong Province. We specialize in high-purity, 100% water-soluble magnesium and sulfate-based compounds for agriculture, feed, and industrial applications.
A trusted name in chemical manufacturing with decades of expertise in magnesium and sulfate compounds.
UNITED INDUSTRY LIMITED has been a world leader in the production of magnesium sulfate since 1989. Based in Laizhou, Shandong Province, our state-of-the-art facilities ensure consistent quality and large-scale output to meet global demand.
We manufacture a wide range of magnesium sulfate hydrates—including heptahydrate, monohydrate, trihydrate, pentahydrate, and anhydrous forms—alongside potassium sulphate, ferrous sulphate, magnesium oxide, and kieserite-based compound fertilizers.
High-purity, water-soluble chemical solutions for agriculture, animal nutrition, and industrial use.
Fertilizer grade, 2-4mm granules, 100% water soluble
Fertilizer | MgSO₄·H₂O
100% water soluble granular fertilizer
Fertilizer | MgSO₄·3H₂O
100% water soluble powder, chloride-free
Fertilizer | K₂SO₄
High-purity granular SOP for blending
Fertilizer | K₂SO₄
High iron content, feed and industrial grade
FeSO₄·7H₂OFeed grade, 0.1-1mm, 0.2-3mm, 1-4mm
Feed Grade | Reagent GradePowder form, 85%, 90%, 95% purity
Industrial & Feed GradePowder and granular forms available
Anhydrous | 100% Active100% water soluble fertilizer powder
Fertilizer | Granular & PowderBlended magnesium sulfate monohydrate
Custom FormulationsAvailable in flake and liquid forms
Industrial & AgriculturalTailored formulations for specific needs
OEM & Private LabelOur production facilities in Laizhou, Shandong Province are equipped with modern technology and adhere to strict quality assurance protocols. As the largest magnesium sulfate producer in China, we maintain full control over raw materials, processing, and packaging.
Consistent batch quality and traceability
All fertilizer products dissolve completely
Serving customers in over 50 countries
Heptahydrate (MgSO₄·7H₂O) contains seven water molecules and is commonly used in feed and agriculture. Monohydrate (MgSO₄·H₂O), also known as kieserite, has one water molecule and is preferred for long-term soil application due to slower release.
Yes, all our fertilizer-grade magnesium sulfate and potassium sulphate products are 100% water soluble, making them ideal for drip irrigation, foliar feeding, and hydroponics.
Yes, we provide flexible packaging options including 25kg, 50kg, 1000kg bags, and custom labeling for OEM and private label clients.
Our production follows international quality standards. We can provide COA, MSDS, and other documentation upon request.
Interested in our magnesium sulfate, potassium sulphate, or other specialty chemicals? Contact us for pricing, samples, or technical support.
Visit Official Website to ContactFor inquiries, please visit the official site to submit your request directly.
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