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China Magnesia Brick Suppliers - High-Temperature Resistance from Leading Factory for Durable Industrial Use
Core Advantages
Superior Heat Resistance
With a refractoriness under load (RUL) of ≥1700℃ and low thermal conductivity, it effectively retains heat, reduces energy consumption, and maintains structural integrity even in long-term high-temperature operations.
Strong Corrosion Resistance
High magnesia content (≥92%) enables excellent resistance to alkaline slags, molten metals, and chemical reagents, minimizing wear and extending service life in aggressive industrial environments.
Exceptional Mechanical Strength
Dense structure and high compressive strength (≥25MPa) prevent cracking and spalling caused by thermal shock, ensuring stable performance during temperature fluctuations.
Eco-Friendly & Compliant
Produced with low-pollution processes, free of harmful substances, and compliant with ISO 9001 standards, meeting global environmental and quality requirements.
Customizable Specifications
We offer tailored sizes, shapes, and magnesia content to fit specific furnace designs and industrial needs, providing personalized refractory solutions.
Product Parameters
| Item | Magnesia Bricks | ||||||
|---|---|---|---|---|---|---|---|
| DMZ-98A | DMZ-98B | DMZ-97A | DMZ-97B | DMZ-96 | DMZ-95 | DMZ-92 | |
| MgO % | 97.5 | 97.3 | 97 | 96.5 | 96 | 95 | 92 |
| CaO % | 1.3 | 1.6 | 1.5 | 1.8 | 1.8 | 2.0 | 2.5 |
| SiO₂ % | 0.7 | 0.8 | 0.8 | 1.0 | 2.0 | 2.4 | 3.0 |
| Bulk Density (g/cm³) | 3.05 | 3.03 | 3.0 | 2.98 | 2.98 | 2.95 | 2.92 |
| Apparent Porosity (%) | 14.5 | 16 | 15 | 15.50 | 15.50 | 16 | 17 |
| Cold Crushing Strength (MPa) | 95 | 95 | 95 | 95 | 90 | 90 | 90 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | 1700 | 1700 | 1700 | 1700 | 1680 | 1620 | 1540 |
| Thermal Shock Stability (950℃ cooling) times | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Detailed Application Scenarios
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1 Glass Industry
◎ Our magnesia bricks are widely applied in glass furnace regenerators and melting furnaces, with targeted performance for harsh working conditions. In regenerators, high-purity magnesia bricks (MgO ≥ 97%) are used for upper checker bricks and upper walls, while medium-grade ones (MgO 95%-96%) fit the middle and lower checker bricks (800-1000℃ area). They excel in heat storage and transfer at 1100-1300℃, boosting furnace thermal efficiency. With low apparent porosity and strong corrosion resistance, they resist alkali metal oxides, sulfides, and soot erosion, avoiding loose intercrystalline structure caused by low-melting substances. Also suitable for regenerator flues and breast walls, and melting furnace crowns/walls, adapting to float glass and bottle glass furnaces, ensuring stable glass quality and long service life.
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2 Cement Industry
◎ Applied in the burning zone and transition zone of rotary kilns for cement production. Withstands high temperatures and erosion from cement clinker and alkaline dust, reducing lining replacement frequency and improving production efficiency. Ideal for large-scale cement plants pursuing continuous operation.
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3 Steel Industry
◎ Widely used in the lining of steelmaking furnaces, including electric arc furnaces, basic oxygen furnaces (BOF), and ladles. It resists erosion from molten steel and alkaline slags, ensuring the furnace lining's long service life and stable steel quality. Suitable for slag lines, tapping mouths, and other key parts with high wear and corrosion.
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4 Non-Ferrous Metallurgy Industry
◎ Suitable for the lining of furnaces used in copper, aluminum, and zinc smelting. Withstands erosion from molten non-ferrous metals and acidic/alkaline slags, ensuring stable smelting processes and reducing production losses. Applied in blast furnaces, reverberatory furnaces, and electrolytic cells.
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5 Other High-Temperature Industries
◎ Also used in waste incinerators, petroleum coke calcination furnaces, and ceramic kilns. Its excellent heat resistance and corrosion resistance make it adaptable to various harsh high-temperature environments, providing reliable refractory protection for industrial production.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
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Q What is the maximum service temperature of your magnesia bricks?Our high-purity magnesia bricks (DMZ-98A/98B) offer a refractoriness under load (RUL) of ≥1700℃ at 0.2MPa, making them suitable for the most demanding high-temperature applications including glass furnace regenerators, steelmaking furnaces, and rotary kilns.
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Q Which grade of magnesia brick is best suited for glass furnace regenerators?For the upper checker bricks and upper walls of glass furnace regenerators, we recommend high-purity grades with MgO ≥ 97% (DMZ-97A or above). For middle and lower checker brick zones (800–1000℃), medium-grade bricks with MgO 95%–96% (DMZ-95 or DMZ-96) are a cost-effective and reliable choice.
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Q Can magnesia bricks resist acidic slag environments?Magnesia bricks are primarily alkaline refractory materials, offering outstanding resistance to alkaline slags and molten metals. For non-ferrous metallurgy applications involving mixed acidic/alkaline slag environments, our DMZ-92 to DMZ-96 grades have demonstrated reliable performance in copper, aluminum, and zinc smelting furnaces.
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Q Do you offer custom sizes and shapes for magnesia bricks?Yes. We provide fully customizable specifications including dimensions, shapes, and MgO content to match your specific furnace design and industrial requirements. Please contact our technical team with your drawings or specifications and we will provide a tailored solution and quote.
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Q Are your magnesia bricks compliant with international quality standards?Yes. Our magnesia bricks are manufactured using low-pollution production processes and are free of harmful substances. They are fully compliant with ISO 9001 quality management standards, meeting the environmental and quality requirements of global markets including Europe, North America, and Asia.
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Q What is the typical thermal shock stability of your magnesia bricks?All grades in our magnesia brick range achieve a thermal shock stability of ≥10 times at 950℃ water cooling cycles. This ensures reliable performance during temperature fluctuations in operations such as kiln startups, shutdowns, and process changes, significantly reducing the risk of cracking or spalling.