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Precision-engineered refractory bricks designed to withstand extreme temperatures and harsh industrial environments.
Corundum brick is a premium-grade refractory material manufactured with an alumina (Al₂O₃) content typically exceeding 90%, often reaching 99%+ in high-purity variants. Its crystalline corundum phase delivers extraordinary hardness, thermal stability, and chemical resistance — properties that are indispensable for the demanding conditions inside industrial boilers.
Industrial boilers operate under continuous cycles of extreme heat, mechanical stress, and corrosive flue gases. Standard refractory materials often fail prematurely under these conditions, leading to costly unplanned shutdowns. Corundum bricks, by contrast, maintain structural integrity at temperatures exceeding 1700°C, resist slag penetration, and withstand rapid thermal cycling without cracking.
As global energy demands grow and industrial processes push toward higher efficiency and longer operational cycles, corundum brick has become the material of choice for engineers designing next-generation boiler lining systems across power generation, petrochemical, waste-to-energy, and heavy manufacturing sectors.
With Al₂O₃ content above 90%, corundum bricks deliver 3–5× longer service life compared to standard fireclay bricks in industrial boiler environments — significantly reducing maintenance costs and downtime.
Engineered to perform where ordinary refractories fail — here's what sets corundum brick apart.
Withstands continuous service temperatures of 1600–1800°C, making it ideal for the combustion zones and superheater sections of high-pressure industrial boilers.
Excellent resistance to acidic and alkaline slag, sulfur compounds, and corrosive flue gases commonly found in coal-fired, biomass, and waste incineration boilers.
Mohs hardness of 9 — second only to diamond — ensures minimal erosion from high-velocity gas flows and particulate matter within boiler chambers.
Advanced microstructure engineering provides outstanding resistance to thermal cycling, preventing crack propagation during boiler start-up and shutdown cycles.
Apparent porosity below 18% and bulk density above 3.0 g/cm³ prevent slag infiltration and gas permeation, extending lining service life dramatically.
Low thermal conductivity variants help maintain optimal heat retention within the boiler, improving thermal efficiency and reducing fuel consumption by up to 8%.
The global industrial boiler refractory market is undergoing significant transformation — and corundum brick is at the center of it.
With over 2,200 waste-to-energy plants operational globally and hundreds more under construction, the demand for high-purity corundum brick linings has surged. These facilities require refractories that can withstand highly corrosive chlorine-rich and sulfur-rich combustion environments — conditions where corundum brick excels above all alternatives.
As aging coal and biomass power plants undergo efficiency upgrades to meet stricter emission standards, operators are replacing traditional fireclay and silica brick linings with high-alumina corundum systems. This retrofit market represents a multi-billion dollar opportunity globally through 2030.
Hydrogen co-firing boilers and advanced biomass combustion systems operate at higher temperatures with more reactive combustion atmospheres. Corundum brick's chemical inertness and thermal stability make it the only viable lining material for these emerging clean energy technologies.
Leading refractory manufacturers are now integrating AI-driven thermal modeling and predictive maintenance algorithms into their engineering services. This enables precise corundum brick lining designs optimized for each specific boiler's operating profile, maximizing service life while minimizing material usage and installation costs.
From combustion chambers to economizer zones — corundum brick delivers critical protection across every section of the industrial boiler.
The primary firebox demands maximum thermal resistance. High-purity corundum bricks form the critical first-line defense against temperatures exceeding 1600°C and direct flame impingement.
Molten slag accumulation zones require exceptional corrosion resistance. Corundum brick with >95% Al₂O₃ resists slag penetration and chemical attack from alkali-rich combustion byproducts.
High-velocity steam and gas flows create severe erosion conditions. Dense corundum bricks with low porosity provide the wear resistance needed to protect tube panels and duct walls.
Municipal solid waste combustion generates HCl, SO₂, and heavy metal vapors. Corundum brick linings provide unmatched chemical barrier protection, reducing maintenance intervals by 40–60%.
Reforming and cracking furnaces in oil refining require refractories that maintain dimensional stability under cyclic thermal loading. Corundum brick delivers consistent performance across thousands of thermal cycles.
Biomass combustion produces highly corrosive alkali chlorides and sulfates. High-purity corundum brick resists alkali attack far superior to aluminosilicate alternatives, making it the preferred choice for renewable energy boilers.
Standard performance parameters — custom formulations available upon request for specific boiler operating conditions.
| Property | Standard Grade (90% Al₂O₃) | High-Purity Grade (95% Al₂O₃) | Ultra-Pure Grade (99% Al₂O₃) |
|---|---|---|---|
| Al₂O₃ Content (%) | ≥ 90 | ≥ 95 | ≥ 99 |
| Bulk Density (g/cm³) | ≥ 2.90 | ≥ 3.00 | ≥ 3.50 |
| Apparent Porosity (%) | ≤ 20 | ≤ 18 | ≤ 15 |
| Cold Crushing Strength (MPa) | ≥ 100 | ≥ 120 | ≥ 150 |
| Refractoriness Under Load T0.6 (°C) | ≥ 1580 | ≥ 1650 | ≥ 1700 |
| Max Service Temperature (°C) | 1650 | 1750 | 1800 |
| Thermal Shock Resistance (cycles) | ≥ 20 | ≥ 30 | ≥ 40 |
| Recommended Application | General boiler zones | Combustion chambers, slag zones | Extreme temp & corrosion zones |
Zhengzhou SK Refractory Co., Ltd. (SK) is located in Xinmi, Zhengzhou, China — the heart of China's refractory manufacturing industry. For over twenty years, SK Refractories has been dedicated to delivering high-performance, reliable refractory solutions that redefine durability and efficiency for clients worldwide.
Founded on the principles of innovation, quality, and sustainability, SK serves key sectors including steelmaking, cement production, non-ferrous metallurgy, glass manufacturing, and petrochemical processing. Our product range includes corundum bricks, zircon bricks, mullite bricks, sillimanite bricks, silica bricks, magnesia bricks, low porosity fireclay blocks, insulation bricks, and refractory castables.
SK's quality management system is certified to ISO 9001, reflecting our commitment to the highest standards of manufacturing excellence. With advanced automated pressing and controlled sintering processes, every brick we produce meets rigorous international quality benchmarks.
Contact Us TodayEvery corundum brick leaving our facility passes rigorous multi-stage quality inspection — because your boiler's reliability depends on it.
On-Time Delivery Rate & Quality Acceptance — consistently maintained across all international orders.
SK Refractories is well recognized in both domestic and international markets for the consistent quality of our refractory bricks. Our products have been successfully exported to more than 35 countries including the USA, Spain, Germany, Italy, Brazil, Belgium, India, Japan, and South Korea.
We partner with trusted raw material suppliers to secure premium-grade corundum and alumina, leveraging advanced manufacturing processes — automated pressing, controlled sintering, and precision dimensional inspection — to ensure every batch meets your exact specifications.
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Our obligation is to supply high quality refractory materials and service to achieve long lifetime of high temperature furnaces. SK Refractories will always improve itself to provide better refractory products and service to customers all over the world.
Explore our full selection of high-performance refractory bricks engineered for industrial boiler and furnace applications.
Andalusite Brick for Industrial Boiler Linings
Fused Re-sintered Corundum Mullite Brick for Boiler Linings
Magnesite Chrome Brick for Industrial Boiler Linings
Zircon Mullite Brick for Industrial Boiler High-Temp Linings
Silica Brick for Industrial Boiler Furnace Linings
Zero Expansion Silica Brick for Boiler High-Temp Linings
Sintered AZS Corundum Brick for Industrial Boiler Linings
Magnesia Brick for Industrial Boiler Lining Applications
We sincerely welcome both new and existing international customers to cooperate with us in a friendly manner and work together to create a bright future. Our engineering team is ready to design the optimal corundum brick lining solution for your specific boiler application.
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