Excellent Thermal Stability Magnesia Non-toxic Environmentally Friendly

Commonly Used In Steel Smelting Casting Furnace Lining Flame Equipment Magnesium Oxide (MgO)

Product Introduction

Magnesium oxide (MgO, CAS 1309-48-4) is an inorganic mineral oxide produced primarily through high-temperature calcination of magnesite (MgCO₃) or magnesium hydroxide (Mg(OH)₂). It is a white, hygroscopic solid mineral that occurs naturally as periclase, crystallizing in a cubic rock-salt structure with strong ionic bonding between Mg²⁺ and O²⁻ ions.

With a molecular weight of 40.30 g/mol, MgO delivers the highest elemental magnesium content (~60 wt%) among all magnesium sources. It is characterized by an exceptionally high melting point of 2852°C, a bulk density ranging from 0.1 to 0.5 g/mL depending on grade, and a saturated aqueous solution pH of 10.3, reflecting its strong alkaline nature.

Magnesium oxide finds critical applications spanning multiple industries, including high-temperature refractories, electrical insulators, dietary supplements, water treatment, agriculture (as fertilizer and feed additive), construction materials, and catalytic supports. Its commercial significance is driven by its acid-neutralizing capacity, thermal stability, and cost-effectiveness relative to organic magnesium salts and alternative basic oxides.

Parameters (Table)

Product Features

• High Thermal Stability
  MgO possesses an exceptionally high melting point of 2852°C and boiling point of 3600°C, enabling stable performance in extreme high-temperature environments. Its thermal conductivity ranges from 40 to 60 W/(m·K) at room temperature, superior to many other ceramic insulators.
• Superior Electrical Insulation
  With a wide bandgap of approximately 7.8 eV and dielectric constant of 9.6, MgO demonstrates outstanding electrical insulation properties suitable for high-voltage applications. It is widely used as an insulating filler in mineral-insulated cables and heating elements.
• Chemical Stability and Inertness
  MgO remains chemically stable at elevated temperatures and is inert toward high-alumina refractories up to 1540°C. It exhibits excellent resistance to heat, slag, and corrosion.
• Buffered Alkalinity
  Unlike strong alkalis (NaOH, Ca(OH)₂) that produce rapid, steep pH increases with high overshoot risk, MgO provides controlled, buffered neutralization with a natural pH ceiling of 10.3. This inherent buffering capacity prevents excessive alkalinity and system damage.
• High Elemental Magnesium Content
  MgO delivers ~60 wt% elemental magnesium—3.75× more per gram than magnesium citrate—enabling compact, high-potency formulations with drastically reduced excipient load.
• Versatile Physical Forms
  Commercially available in light (fluffy, high surface area, low bulk density) and heavy (dense, low surface area, high bulk density) grades, produced at different calcination temperatures (400–800°C for light; >1000°C for heavy).
• Non-Toxicity and Environmental Friendliness
  MgO is non-toxic, odorless, and environmentally friendly, making it suitable for use in medicine, food additives, and biotechnological applications.

Product Advantages

• Cost-Effectiveness — MgO provides a 275% mass efficiency advantage over magnesium citrate, significantly reducing raw material costs for cost-sensitive nutraceutical and dietary supplement formulations. Its low raw material price combined with high thermal conductivity (2–3× higher than Al₂O₃) offers exceptional cost-effectiveness.
• Superior Thermal Performance — With a melting point of 2852°C and thermal conductivity of 40–60 W/(m·K), MgO withstands temperatures exceeding 2000°C while maintaining structural integrity. Its low thermal expansion coefficient (~13 × 10⁻⁶ K⁻¹) provides excellent thermal shock resistance.
• Precise pH Control — MgO's buffered neutralization mechanism offers a significant safety and process control advantage over strong alkalis in water treatment and dietary antacid applications, reducing the risk of corrosion, equipment damage, or mucosal irritation.
• Multi-Industry Versatility — MgO serves critical functions across diverse industries—from refractory linings in steelmaking furnaces and cement kilns, to electrical insulators, catalyst supports, CO₂ adsorbents, agricultural soil amendments, and dietary antacids.
• Regulatory Compliance — Available in USP/FCC/EP grades with multi-compendial compliance, MgO meets stringent quality standards for food, feed, and dietary supplement applications. KOSHER and HALAL certified options are available.
• Enhanced Formulation Efficiency — Light MgO provides superior flowability and compressibility for direct compression tableting, while Heavy MgO offers higher mass per volume, reducing capsule fill volume in supplement formulations.
• Sustainable and Biocompatible — MgO's non-toxic nature and biocompatibility have led to emerging applications in biomedical implants and tissue engineering scaffolds. Its use in agriculture as a soil amendment improves crop yields and addresses magnesium deficiencies in soil.

Applications

• Refractories – linings for furnaces, kilns, crucibles.

• Dietary supplements & healthcare – antacids, laxatives, tablet excipients (light grade).

• Agriculture – soil pH correction, magnesium fertilizer, animal feed additive.

• Water & wastewater – acid neutralisation, heavy metal precipitation, phosphate removal.

• Electrical insulation – filler in mineral‑insulated cables and heating elements.

• Construction – magnesium oxychloride cements, fireproof boards.

• Catalysis & adsorption – catalyst support and CO₂ capture.

Technical

• Production – calcination of magnesite or Mg(OH)₂ at 400–1000 °C (light grade) or >1000 °C (heavy grade).

• Grades – purity from 85 % (industrial) to 99.99 % (high‑purity 4N); light (bulk density ≤0.15 g/mL) and heavy (≥0.25 g/mL).

• Key parameters – MgO content, loss on ignition, particle size distribution, specific surface area, and acid‑neutralising capacity.

• Standards – compliant with USP, FCC, EP, and other national pharmacopoeias where applicable.

Principle (Mechanism of Action)

• Buffered alkalinity – MgO hydrolyses slowly in water to Mg(OH)₂, releasing OH⁻ ions but capping pH at ≈10.3, avoiding sudden over‑alkalisation.

• Thermal resistance – ionic crystal structure with very high melting point (2852 °C) and low thermal expansion, providing exceptional heat endurance.

• Adsorption & reactivity – porous surface (especially light grade) enables physical adsorption of impurities and chemical reaction with acidic species.

• Cementitious reaction – reacts with MgCl₂ or MgSO₄ to form strong, fire‑resistant oxychloride/sulphate cements.

Services

• Customisation – particle size, bulk density, purity level, and packaging (bags, big bags, drums) tailored to client needs.

• Technical support – formulation advice, processing optimisation, and application troubleshooting.

• Sample service – free or small‑charge samples for qualification trials.

• Documentation – full COA, SDS, and regulatory certificates (Kosher, Halal, GMP) provided.

• Logistics – global shipping with proper handling and storage guidance.

• After‑sales – quality feedback, continuous improvement, and dedicated account management.