Magnesium Oxide
Winstar Ingredients supplies magnesium oxide (MgO) in 99%, 94% and 90% grades for feed ingredient sourcing. This mineral ingredient provides magnesium for premixes, aquaculture feed and ruminant nutrition, with grade selection based on the required assay and formulation.

Available Grades
| Grade | Specification support |
|---|---|
| Magnesium Oxide 99% | High-assay option; grade-specific TDS and batch COA available on request. |
| Magnesium Oxide 94% | Feed mineral option documented at MgO ≥94%; confirm the full specification for your order. |
| Magnesium Oxide 90% | Available on request; confirm detailed specifications and suitability for the intended application. |
Percentages refer to magnesium oxide content, not elemental magnesium. Impurity limits, particle size and bulk density are confirmed separately for each grade.
Product Profile
- Chemical formula: MgO
- CAS number: 1309-48-4
- Appearance: white to off-white powder, depending on grade
- Function: magnesium source and mineral ingredient for feed formulations
Feed Applications
Magnesium oxide is used in mineral premixes and complete feed. For aquaculture, it supplies magnesium as part of a balanced mineral program. For ruminants, it can be included in mineral blends and rumen-buffering formulations. Suitability depends on the selected grade, reactivity, particle size and the complete ration.
Packing and Documentation
Available packing options include 25 kg bags, 50 kg bags and 1,350 kg bulk bags, subject to grade and order confirmation. Contact us for the current TDS, batch COA, SDS, packing details, minimum order quantity and lead time.
For a quotation, specify your preferred grade (99%, 94% or 90%), intended application, quantity, packing and destination market.
