Large Granular Magnesium Sulfate Heptahydrate Inorganic Chemicals –
High-Purity, Agricultural Grade
Large Granular Magnesium Sulfate Heptahydrate (MgSO₄·7H₂O) is a
high-purity, white crystalline compound with well-defined large
particle size, typically ranging from 4 mm to 6 mm. It is
manufactured in accordance with international standards such as
USP, BP, EP, and CP, and is specially formulated for use in
agriculture, horticulture, and certain industrial applications
where low dust, controlled release, and excellent handling
characteristics are required.
This product is composed of magnesium sulfate combined with seven
molecules of water, providing both magnesium (Mg) and sulfur (S),
two essential secondary nutrients for plant growth. Magnesium is
vital for chlorophyll synthesis and enzyme activation, while sulfur
is necessary for amino acid formation and metabolic function.
The large granular form is particularly advantageous in large-scale
field applications. It reduces product loss due to wind drift,
allows for even broadcasting via mechanical spreaders, and extends
the release time of nutrients in soil. It is widely applied to
crops such as vegetables, fruit trees, oilseed plants, tobacco, and
grains.
In addition to its role in agriculture, large granular magnesium
sulfate heptahydrate is also used in the production of
magnesium-based chemicals, in wastewater treatment, and as a
processing agent in industrial manufacturing.
This product is characterized by high solubility, purity of ≥99.5%,
low impurity levels, and a neutral pH range suitable for most soil
types. It is compatible with most NPK fertilizers and can be
applied directly or as part of compound blends.
| Specification | Anhydrous Magnesium Sulfate (MgSO₄) | Heptahydrate Magnesium Sulfate (MgSO₄·7H₂O) | Pentahydrate Magnesium Sulfate (MgSO₄·5H₂O) | Trihydrate Magnesium Sulfate (MgSO₄·3H₂O) | Dihydrate Magnesium Sulfate (MgSO₄·2H₂O) | Monohydrate Magnesium Sulfate (MgSO₄·H₂O) |
|---|
| Appearance | White powder | White crystalline powder or crystals | White crystalline powder or crystals | White crystalline powder or crystals | White crystalline powder or crystals | White crystalline powder or crystals |
| Main Content (%) | ≥99.5 | ≥99 | ≥99 | ≥99 | ≥99 | ≥98 |
| Magnesium (Mg) (%) | 9.80 | 11.31 | 13.65 | 15.23 | 17.21 | 19.6 |
| Sulfate (SO₄) (%) | 48.59 | 56 | 68 | 76 | 86 | 98 |
| Magnesium Oxide (MgO) (%) | 16.20 | 19.00 | 22.70 | 25.30 | 28.60 | 32.60 |
| pH (5% solution) | 5.0 - 9.2 | 5.0 - 9.2 | 5.0 - 9.2 | 5.0 - 9.2 | 5.0 - 9.2 | 5.0 - 9.2 |
| Iron (Fe) (%) | ≤0.0015 | ≤0.0015 | ≤0.0015 | ≤0.0015 | ≤0.0015 | ≤0.0015 |
| Chloride (Cl) (%) | ≤0.014 | ≤0.014 | ≤0.014 | ≤0.014 | ≤0.014 | ≤0.014 |
| Heavy Metals (Pb) (%) | ≤0.0006 | ≤0.0006 | ≤0.0007 | ≤0.0007 | ≤0.0008 | ≤0.0008 |
| Arsenic (As) (%) | ≤0.0002 | ≤0.0002 | ≤0.0002 | ≤0.0002 | ≤0.0002 | ≤0.0002 |
