CAS No.: 1309-48-4
Type: Magnesium Salt
Material: Magnesium Oxide
Color: White
Product Details
High-Purity Grade Heavy Magnesium Oxide Powder – Product Data Sheet & Specifications
- Product Name: High-Purity Grade Heavy Magnesium Oxide Powder
- Synonyms: Calcined Magnesia (Heavy), Dense Magnesia, High-Reactivity Magnesia
- Chemical Formula: MgO
- CAS No.: 1309-48-4
- EINECS No.: 215-171-9
Product Description
High-Purity Grade Heavy Magnesium Oxide Powder is a dense, white crystalline material obtained by calcining high-purity magnesium carbonate or magnesium hydroxide at high temperatures (≥1300°C) under controlled conditions. This process results in a product with high bulk density, compact crystal morphology, and superior thermal stability compared to light magnesium oxide. Its purity and physical uniformity make it indispensable for applications requiring mechanical strength, chemical inertness, and heat resistance.
The material exhibits low reactivity and low surface activity, which is advantageous in metallurgy, refractories, electrical components, and insulating coatings. Due to its high melting point (2852°C) and excellent electrical resistivity, it is widely used as a heat-resistant, insulating, and stabilizing component in advanced manufacturing processes. Its low impurity content ensures color stability and consistency during high-temperature operations, making it suitable for ceramic glazes, crucibles, and magnesia bricks.
Key Characteristics
- High Purity & Chemical Stability: MgO content ≥99.0%, with extremely low levels of CaO, Fe₂O₃, and Cl⁻ impurities.
- High Bulk Density: Typically 0.8–1.2 g/cm³; ensures robust packing, structural integrity, and high thermal conductivity.
- Superior Heat Resistance: Maintains stable performance at 1800–2000°C, suitable for refractory and metallurgical environments.
- Low Reactivity & Low Moisture Sensitivity: Maintains shelf stability and prevents surface carbonation during storage.
- Uniform Particle Morphology: Optimizes sintering uniformity and provides reliable thermal expansion control.
- Excellent Electrical Insulation: Outstanding dielectric strength for use in electric heating elements and grain-oriented silicon steel coatings.
Detailed Technical Specifications & Analysis
Chemical Composition & Purity
| Parameter | Specification | Standard Grade | High-Purity Grade | Test Method |
| Magnesium Oxide (MgO) | ≥ 98.5% | 98.7–99.1% | ≥ 99.3% | Gravimetric |
| Loss on Ignition (LOI) | ≤ 1.5–3.0% | 2.00% | 0.80% | 950°C ± 25°C |
| Calcium Oxide (CaO) | ≤ 0.50% | 0.30% | ≤ 0.10% | ICP-OES |
| Iron (as Fe₂O₃) | ≤ 0.05% | 0.03% | ≤ 0.01% | Colorimetric |
| Chloride (as Cl⁻) | ≤ 0.10% | 0.08% | ≤ 0.05% | Potentiometric |
| Sulfate (as SO₄²⁻) | ≤ 0.15% | 0.12% | ≤ 0.08% | Gravimetric |
| Heavy Metals (as Pb) | ≤ 0.005% | Meets Stds | ≤ 0.002% | USP/EP |
| Arsenic (As) | ≤ 0.0003% | Meets Stds | ≤ 0.0001% | ICP-MS |
Physical Properties
| Parameter | Specification/Typical Value | Test Method | Remarks |
| Appearance | White, fine, dense powder | Visual | — |
| Bulk Density | 0.8–1.2 g/cm³ | ASTM B527 | Dense & compact structure |
| Tapped Density | 1.1–1.5 g/cm³ | ASTM B527 | For metallurgical use |
| Particle Size (D50) | 5–25 μm | Laser Diffraction | Customizable |
| Particle Size (D97) | ≤ 45 μm | Laser Diffraction | — |
| Surface Area (BET) | 5–15 m²/g | BET | Indicates low reactivity |
| Whiteness | ≥ 92% | CIE Lab | Consistent color |
| Oil Absorption | 20–40 g/100g | ASTM D281 | — |
| Refractoriness | ≥ 1800°C | Furnace Test | Excellent heat resistance |
| Water Solubility | Practically insoluble | — | Soluble in dilute acids |
Key Features & Functional Advantages
- Thermal Durability: Maintains shape and volume stability even under continuous exposure to extreme heat.
- Chemical Inertness: Resistant to most acids and alkalis (except strong acids), ensuring long-term durability.
- Mechanical Strength: Enhances load-bearing capacity and crack resistance in ceramic and refractory applications.
- Low Impurities & Color Stability: Prevents contamination in white ceramics and heat-resistant coatings.
- Controlled Reactivity: Predictable sintering behavior allows for precision processing in advanced ceramics.
- High Electrical Insulation: Perfectly suited as a filler and coating for electric heating elements and grain-oriented silicon steel.
Main Applications & Industries Served
- Refractories & Ceramics: A core component for magnesia-chrome bricks, spinel refractories, and crucibles for high-temperature furnaces.
- Metallurgical Operations: Used as a slagging agent and desulfurizer during the refining of steel and non-ferrous metals.
- Electrical & Electronic Materials: Essential coating material for grain-oriented silicon steel to improve insulation and magnetic control.
- Catalysts & Support Materials: Serves as a catalyst carrier in dehydrogenation, desulfurization, and environmental purification systems.
- High-Temperature Fillers: Reinforcing filler for heat-resistant coatings, adhesives, and composite materials.
- Advanced Ceramics: Used in engineering ceramics and thermal insulation boards requiring dimensional precision and high thermal shock resistance.
Packaging, Storage & Handling
- Standard Packaging: 25kg multi-layer Kraft paper bags with PE liner; 500kg and 1000kg jumbo bags (FIBC) available.
- Customization: Vacuum-sealed or moisture-proof packaging available to extend shelf life.
- Storage: Store in a cool, dry, well-ventilated area; keep away from acids and moisture.
- Shelf Life: 24 months in original sealed packaging under proper storage conditions.
- Handling Precautions: Avoid dust inhalation; use dust masks, safety goggles, and gloves. Ensure local exhaust ventilation during processing.
Safety Information (SDS Summary)
- GHS Classification: Not classified as a hazardous substance according to GHS regulations.
- Hazard Statements: Inhalation of fine dust may cause temporary respiratory or eye irritation.
- First Aid Measures:
- Inhalation: Move to fresh air. Seek medical attention if symptoms persist.
- Eye Contact: Flush immediately with water for several minutes.
- Skin Contact: Wash with soap and water; seek medical attention if irritation occurs.
- Ingestion: Rinse mouth; do not induce vomiting. Seek medical help if large quantities are ingested.