Manganese sulphate grades used in agriculture, animal feed, and food fortification are typically distinguished by purity, moisture content, and heavy-metal limits, with feed-grade, fertilizer-grade, and food-grade material meeting different specification thresholds depending on end use. Understanding these distinctions helps procurement and QA teams select the correct grade before a batch reaches formulation.
What Is Manganese Sulphate?
Manganese sulphate is an inorganic manganese salt most commonly supplied as the monohydrate (MnSO4·H2O, CAS 10034-96-5), a pale pink to off-white crystalline powder or granule. It is highly soluble in water and serves as a source of bioavailable manganese, a trace mineral required in small quantities across plant nutrition, animal nutrition, and several industrial processes. Anhydrous and tetrahydrate forms also exist but are less common in commercial trade than the monohydrate.
Manganese Sulphate Grades and Specifications
Commercial manganese sulphate is sold across several grades, each defined by assay, heavy-metal ceilings, and moisture control appropriate to its application. Fertilizer and technical grades tolerate broader impurity ranges, while feed and food-grade material is produced and tested to tighter limits on lead, arsenic, and cadmium. Buyers should always confirm the specific grade against the intended regulatory framework for their market rather than assuming equivalence across suppliers.
| Grade | Typical Assay (MnSO4·H2O) | Typical Use | Key Quality Markers |
|---|---|---|---|
| Technical / Fertilizer grade | ~98% | Micronutrient fertilizer blends, foliar sprays | Moisture content, water insolubles |
| Feed grade | ~98-99% | Trace mineral premixes for animal nutrition | Heavy metal limits, particle size for premixing |
| Food / Pharma grade | ~99% or higher | Food fortification, dietary formulations | FCC or comparable pharmacopoeial heavy-metal and assay limits |
| Industrial grade | Variable | Dyeing/textile mordants, ceramic glazes | Colour consistency, insoluble matter |
Applications Across Industries
In agriculture, manganese sulphate corrects manganese deficiency in soils and crops where the micronutrient is unavailable or depleted, and it is a standard component of NPK-plus-micronutrient fertilizer blends. In animal nutrition, it is included in trace mineral premixes for livestock and aquaculture feed formulations as a manganese source. In food manufacturing, food-grade material functions as a fortification ingredient in formulated products where manganese is added as a nutrient component, subject to labeling regulations in the country of sale. Industrially, manganese sulphate is used in textile dyeing as a mordant, in ceramics and glass as a colorant precursor, and in various electrochemical and metal-finishing processes.
Formulation, Solubility and Handling Notes
Manganese sulphate monohydrate dissolves readily in water, and its aqueous solutions are mildly acidic, typically in the pH 4-5 range depending on concentration, which formulators should account for when blending with alkaline-sensitive ingredients. The monohydrate loses its water of crystallization on prolonged exposure to elevated temperatures, so processes involving heat should be validated to confirm the intended hydrate form is preserved through drying or granulation steps. The material is hygroscopic and should be handled under controlled humidity to avoid caking during storage or premix blending.
Storage, Packaging and QA Documentation
Manganese sulphate is typically packaged in 25 kg multi-ply PP or PE-lined bags for standard trade volumes, with bulk bags (FIBC, up to around 1,000 kg) available for fertilizer and feed-grade shipments. Storage should be in a dry, well-ventilated area away from strong oxidizing agents, with pallets kept off damp flooring to prevent moisture ingress through bag seams. Before qualifying a lot, buyers should request a certificate of analysis (COA) confirming manganese assay, moisture content, and heavy-metal results; a current specification sheet stating the applicable grade and standard; and lot traceability documentation, particularly for feed and food-grade material subject to downstream regulatory audits.
FAQ
What grades of manganese sulphate are used in animal feed?
Feed-grade manganese sulphate, typically assaying around 98-99% MnSO4·H2O with controlled heavy-metal limits, is the standard input for trace mineral premixes used in livestock and aquaculture feed formulations.
Is manganese sulphate soluble in water?
Yes, manganese sulphate is highly soluble in water, forming a mildly acidic solution, which is why it is favored in liquid fertilizer blends and premix applications requiring rapid dissolution.
What purity of manganese sulphate is used in fertilizer blends?
Fertilizer and technical grades commonly specify an assay near 98% MnSO4·H2O, with moisture and insoluble-matter limits set to ensure consistent handling in granulation and blending equipment.
How DIC Supports This
DIC stocks manganese sulphate regionally across grade options spanning technical, feed, and food-grade specifications, supported by dedicated warehousing for sensitive food and pharma-grade lots. Vendor-managed inventory (VMI) programs and lot-level documentation support are available to help formulators and QA teams maintain consistent supply and traceability across production cycles.
