High-purity magnesium oxide produced from refined magnesium hydroxide, calcined at over 1,000°C. Available in 95% and 99% purity grades for ceramics, refractories, rubber, food additives, and fine chemical applications.
High-purity Magnesium Oxide (MgO) is manufactured from refined magnesium hydroxide raw powder through calcination at temperatures exceeding 1,000°C. The process yields a product with controlled particle size, high surface area, and excellent chemical purity — making it suitable for demanding applications in ceramics, advanced refractories, rubber compounding, and fine chemical synthesis.
ZHAOYUAN supplies MgO in two purity grades: a 95% grade with high surface area optimized for ceramics and enamel applications, and a 99% ultra-high-purity grade for fine chemicals, food additives, and specialty industrial uses requiring minimal impurities.
| Parameter | Specification | Typical Value |
|---|---|---|
| MgO Content (as-is basis) | ≥ 95.0% | 95.13% |
| MgO Content (ignited basis) | ≥ 99.0% | — |
| Calcium as CaO | ≤ 0.05% | 0.007% |
| Iron as Fe₂O₃ | ≤ 0.05% | 0.001% |
| Na + K | ≤ 100 ppm | 46 ppm |
| Chloride as Cl⁻ | ≤ 0.65% | 0.58% |
| Heavy Metals | ≤ 10 ppm | — |
| Loss on Ignition (LOI) | ≤ 5.0% | 4.59% |
| Particle Size D50 | 5 – 8 μm | 6.4 μm |
| Particle Size D99 | 20 – 40 μm | 35.5 μm |
| BET Surface Area | 90 – 150 m²/g | 110.5 m²/g |
| Bulk Density | 0.3 – 0.5 g/cm³ | 0.43 g/cm³ |
| 325 Mesh Screening Rate | ≥ 95% | — |
| Whiteness | ≥ 95% | 97.4% |
High BET surface area (90–150 m²/g) makes this grade particularly suitable for ceramics, enamel, and catalyst applications.
| Parameter | Specification | Typical Value |
|---|---|---|
| MgO Content | ≥ 99.0% | 99.45% |
| Calcium as CaO | ≤ 0.05% | 0.01% |
| Iron as Fe₂O₃ | ≤ 0.05% | 0.001% |
| Na + K | ≤ 100 ppm | 87 ppm |
| Chloride as Cl⁻ | ≤ 0.15% | 0.03% |
| Acid Insoluble | ≤ 0.15% | 0.02% |
| Heavy Metals | ≤ 10 ppm | — |
| Loss on Ignition (LOI) | ≤ 1.0% | 0.09% |
| Particle Size D50 | 3 – 5 μm | 4.3 μm |
| BET Surface Area | 2 – 12 m²/g | 4.86 m²/g |
Ultra-low LOI (≤1.0%) and chloride (≤0.15%) make this grade suitable for food additives, fine chemicals, and high-purity industrial applications.
| Standard Packaging | 25 kg PE bags with moisture-proof inner PE liner |
| Bulk Packaging | 600 kg / 800 kg jumbo PE bags with moisture-proof inner liner |
| Storage Conditions | Store in a clean, dry area. MgO rapidly absorbs moisture from air and hydrolyzes — keep sealed and protected from humidity at all times. |
| Shelf Life | 12 months from manufacture date under recommended storage conditions |
| HS Code | 2519.90 (Magnesium oxide) |
The 95% purity grade has a high BET surface area (90–150 m²/g) and finer particle size (D50 5–8 μm), making it suited to ceramics, enamel, and catalyst applications. The 99% grade has ultra-low loss on ignition (≤1.0%) and chloride content (≤0.15%), making it suitable for food additives, fine chemicals, and high-purity industrial uses.
The 99% purity grade is used as a food-grade magnesium source, anti-caking agent, and acidity regulator in food processing and nutritional supplements, with heavy metals limited to ≤10 ppm and chloride at ≤0.15%.
The 95% purity grade's BET surface area of 90–150 m²/g makes it particularly effective as a flux and additive in ceramic bodies, glazes, and enamel coatings, and as a catalyst support and active component in chemical synthesis including hydrogenation and oxidation reactions.
Yes — magnesium oxide is a key raw material for refractory bricks, castables, and gunning mixes used in steel furnaces, cement kilns, and glass tanks, where its high melting point and thermal stability are essential.
MgO rapidly absorbs moisture from air and hydrolyzes, so it must be kept sealed and protected from humidity at all times in a clean, dry storage area. Shelf life is 12 months from the manufacture date under recommended storage conditions.
Standard packaging is 25 kg PE bags with a moisture-proof inner PE liner. Bulk packaging in 600 kg or 800 kg jumbo PE bags with moisture-proof inner liner is also available for larger orders.
Pricing depends on purity grade (95% vs. 99%), particle size/surface area specification, order quantity, packaging, and destination/shipping terms. Contact us with your target grade and quantity for a quote.
Yes — a certificate of analysis (COA) confirming the tested values (MgO content, trace elements, particle size, BET surface area) and a material safety data sheet (MSDS) are available on request with every shipment.
ZHAOYUAN supplies magnesium oxide directly from China with export capability for bulk orders worldwide, and also delivers turnkey EPC engineering for cellulose ether production plants — giving customers both a chemical supply source and a manufacturing-side engineering partner.