Product Overview & Executive Summary
USP Grade Heavy Magnesium Oxide Powder - Product Datasheet & Specifications
Product Name: USP Grade Heavy Magnesium Oxide Powder
Synonym: Calcined Magnesia (Heavy), Dense Magnesia, High Reactivity Magnesia
Chemical Formula: MgO
CAS Number: 1309-48-4
EINECS Number: 215-171-9
Product Description
USP Grade Heavy Magnesium Oxide Powder is a dense, white crystalline material obtained by calcining high-purity magnesium carbonate or magnesium hydroxide at elevated temperatures (≥1300°C) under controlled conditions. This process yields 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 demanding mechanical strength, chemical inertness, and heat resistance.
The material exhibits low reactivity and low surface activity, which are advantageous in metallurgical, refractory, electrical, and insulation 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 profile ensures color stability and consistency in high-temperature operations, making it suitable for ceramic glazes, crucibles, and magnesia bricks.
 |  |  |
Key Features
High Purity & Chemical Stability: MgO content ≥99.0%, with minimal levels of CaO, Fe2O3, and Cl- impurities.
High Bulk Density: Typically 0.8–1.2 g/cm³; ensures strong packing, structural integrity, and high thermal conductivity.
Exceptional Thermal Resistance: Stable performance up to 1800–2000°C, ideal for refractory and metallurgical environments.
Low Reactivity & Moisture Sensitivity: Maintains shelf stability and prevents surface carbonation during storage.
Uniform Particle Morphology: Optimized for sintering uniformity and reliable thermal expansion control.
Excellent Electrical Insulation: Outstanding dielectric strength for use in electrical heating elements and GOES coatings.
Detailed Technical Specifications & Analytical
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 |
| Chlorides (as Cl) | ≤ 0.10% | 0.08% | ≤ 0.05% | Potentiometric |
| Sulfates (as SO4) | ≤ 0.15% | 0.12% | ≤ 0.08% | Gravimetric |
| Heavy Metals (as Pb) | ≤ 0.005% | Complies | ≤ 0.002% | USP/EP |
| Arsenic (As) | ≤ 0.0003% | Complies | ≤ 0.0001% | ICP-MS |
Physical Properties
Parameter | Specification / Typical Value | Test Method | Notes |
Appearance | White, fine, dense powder | Visual | — |
| Bulk Density (Loose) | 0.8–1.2 g/cm³ | ASTM B527 | Dense and 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 | — |
| Specific 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 endurance |
| Water Solubility | Practically insoluble | — | Soluble in dilute acids |
Key Characteristics & 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: Improves load-bearing capacity and crack resistance in ceramic and refractory applications.
Low Impurity & Color Stability: Prevents contamination in white ceramics and heat-resistant coatings.
Controlled Reactivity: Predictable sintering behavior allows precision processing in advanced ceramics.
High Electrical Insulation: Perfect for use as a filler and coating in electrical steel production.
Primary Applications & Industries Served
Refractories & Ceramics:Core ingredient in magnesia-chrome bricks, spinel refractories, and crucibles used in high-temperature furnaces.
Metallurgical Operations:Used as a slag former and desulfurization agent during steel and non-ferrous metal refining.
Electrical & Electronic Materials:Essential coating material for grain-oriented silicon steel, improving insulation and magnetism control.
Catalyst & Support Materials:Serves as a catalyst base in dehydrogenation, desulfurization, and environmental purification systems.
High-Temperature Fillers:Reinforcement filler for heat-resistant coatings, adhesives, and composites.
Advanced Ceramics:Used in engineered ceramics and thermal insulation panels requiring dimensional accuracy and high thermal shock resistance.
Packaging, Storage & Handling
Standard Packaging: 25 kg multi-ply kraft paper bags with PE liners; optional 500 kg and 1000 kg FIBC (Big Bags).
Custom Options: Vacuum-sealed or moisture-barrier packaging for extended storage life.
Storage: Store in a cool, dry, and well-ventilated area; keep away from acids and moisture.
Shelf Life: 24 months in original sealed packaging under proper storage conditions.
Handling Precautions: Avoid inhalation of dust; use dust masks, safety goggles, and gloves. Ensure local ventilation during handling.
Safety Information (Summary of SDS)
GHS Classification: Not classified as hazardous under GHS regulations.
Hazard Statements: Inhalation of fine dust may cause temporary irritation to respiratory tract or eyes.
First Aid Measures:
- Inhalation: Move person to fresh air, seek medical attention if symptoms persist.
- Eye Contact: Rinse immediately with water for several minutes.
- Skin Contact: Wash with soap and water; seek medical help if irritation occurs.
- Ingestion: Rinse mouth; do not induce vomiting. Seek medical assistance if large amounts are ingested.
Product Overview & Executive Summary
USP Grade Heavy Magnesium Oxide Powder - Product Datasheet & Specifications
Product Name: USP Grade Heavy Magnesium Oxide Powder
Synonym: Calcined Magnesia (Heavy), Dense Magnesia, High Reactivity Magnesia
Chemical Formula: MgO
CAS Number: 1309-48-4
EINECS Number: 215-171-9
Product Description
USP Grade Heavy Magnesium Oxide Powder is a dense, white crystalline material obtained by calcining high-purity magnesium carbonate or magnesium hydroxide at elevated temperatures (≥1300°C) under controlled conditions. This process yields 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 demanding mechanical strength, chemical inertness, and heat resistance.
The material exhibits low reactivity and low surface activity, which are advantageous in metallurgical, refractory, electrical, and insulation 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 profile ensures color stability and consistency in high-temperature operations, making it suitable for ceramic glazes, crucibles, and magnesia bricks.
| | |
Key Features
High Purity & Chemical Stability: MgO content ≥99.0%, with minimal levels of CaO, Fe2O3, and Cl- impurities.
High Bulk Density: Typically 0.8–1.2 g/cm³; ensures strong packing, structural integrity, and high thermal conductivity.
Exceptional Thermal Resistance: Stable performance up to 1800–2000°C, ideal for refractory and metallurgical environments.
Low Reactivity & Moisture Sensitivity: Maintains shelf stability and prevents surface carbonation during storage.
Uniform Particle Morphology: Optimized for sintering uniformity and reliable thermal expansion control.
Excellent Electrical Insulation: Outstanding dielectric strength for use in electrical heating elements and GOES coatings.
Detailed Technical Specifications & Analytical
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 |
| Chlorides (as Cl) | ≤ 0.10% | 0.08% | ≤ 0.05% | Potentiometric |
| Sulfates (as SO4) | ≤ 0.15% | 0.12% | ≤ 0.08% | Gravimetric |
| Heavy Metals (as Pb) | ≤ 0.005% | Complies | ≤ 0.002% | USP/EP |
| Arsenic (As) | ≤ 0.0003% | Complies | ≤ 0.0001% | ICP-MS |
Physical Properties
Parameter | Specification / Typical Value | Test Method | Notes |
Appearance | White, fine, dense powder | Visual | — |
| Bulk Density (Loose) | 0.8–1.2 g/cm³ | ASTM B527 | Dense and 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 | — |
| Specific 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 endurance |
| Water Solubility | Practically insoluble | — | Soluble in dilute acids |
Key Characteristics & 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: Improves load-bearing capacity and crack resistance in ceramic and refractory applications.
Low Impurity & Color Stability: Prevents contamination in white ceramics and heat-resistant coatings.
Controlled Reactivity: Predictable sintering behavior allows precision processing in advanced ceramics.
High Electrical Insulation: Perfect for use as a filler and coating in electrical steel production.
Primary Applications & Industries Served
Refractories & Ceramics:Core ingredient in magnesia-chrome bricks, spinel refractories, and crucibles used in high-temperature furnaces.
Metallurgical Operations:Used as a slag former and desulfurization agent during steel and non-ferrous metal refining.
Electrical & Electronic Materials:Essential coating material for grain-oriented silicon steel, improving insulation and magnetism control.
Catalyst & Support Materials:Serves as a catalyst base in dehydrogenation, desulfurization, and environmental purification systems.
High-Temperature Fillers:Reinforcement filler for heat-resistant coatings, adhesives, and composites.
Advanced Ceramics:Used in engineered ceramics and thermal insulation panels requiring dimensional accuracy and high thermal shock resistance.
Packaging, Storage & Handling
Standard Packaging: 25 kg multi-ply kraft paper bags with PE liners; optional 500 kg and 1000 kg FIBC (Big Bags).
Custom Options: Vacuum-sealed or moisture-barrier packaging for extended storage life.
Storage: Store in a cool, dry, and well-ventilated area; keep away from acids and moisture.
Shelf Life: 24 months in original sealed packaging under proper storage conditions.
Handling Precautions: Avoid inhalation of dust; use dust masks, safety goggles, and gloves. Ensure local ventilation during handling.
Safety Information (Summary of SDS)
GHS Classification: Not classified as hazardous under GHS regulations.
Hazard Statements: Inhalation of fine dust may cause temporary irritation to respiratory tract or eyes.
First Aid Measures:
- Inhalation: Move person to fresh air, seek medical attention if symptoms persist.
- Eye Contact: Rinse immediately with water for several minutes.
- Skin Contact: Wash with soap and water; seek medical help if irritation occurs.
- Ingestion: Rinse mouth; do not induce vomiting. Seek medical assistance if large amounts are ingested.
Quality Assurance & Customization
Manufacturing Quality System:Produced under ISO 9001:2015 certified process with strict in-process quality control.
Batch Certification:Each batch supplied with a detailed Certificate of Analysis (CoA) indicating chemical composition and physical indices.
Regulatory Compliance:Conforms to REACH, RoHS, GB/T, and ASTM standards applicable to industrial magnesium oxide.
Customization Capabilities:
- Adjustable particle size distribution (D50: 5–25 μm).
- Modified specific surface area and reactivity for different industrial needs.
- Optional surface treatments with stearic acid, silane, or fatty acids for better dispersibility in polymers.
- Tailored bulk density and sintering activity upon request.