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High Alumina Refractory Bricks from China Factory - Top Suppliers for Industrial Furnace Applications
Features
1. High Refractoriness
They can withstand very high temperatures, making them suitable for use in furnaces and other high-temperature environments.
2. Excellent Thermal Stability
These bricks maintain their structural integrity and mechanical properties even under rapid temperature changes, reducing the risk of thermal shock damage.
3. Good Insulating Properties
While not as effective as specialized insulating materials, high alumina bricks offer some insulation against heat transfer, helping to conserve energy in industrial applications.
4. Resistance to Corrosion and Abrasion
They are resistant to chemical corrosion and mechanical wear, prolonging their lifespan in harsh operating conditions.
5. Low Thermal Conductivity
This property helps to minimize heat loss and maintain consistent temperature profiles within the refractory lining.
Overall, high alumina bricks are valued for their durability, reliability, and ability to withstand extreme conditions in various industrial processes.
Application
High alumina bricks are commonly used in industries such as steel, cement, glass, and ceramics for their ability to withstand extreme temperatures and harsh conditions. Masonry blast furnace, hot blast stove, electric furnace top and ladle permanent lining.
Main physical and chemical performance index
| Index | LZ-75 | LZ-65 | LZ-55 | LZ-48 |
|---|---|---|---|---|
| Al2O3 % ≥ | 75 | 65 | 55 | 48 |
| Refractoriness ℃ ≥ | 1790 | 1790 | 1770 | 1750 |
| Refractoriness under load (0.6%) ℃ ≥ | 1520 | 1500 | 1470 | 1420 |
| Permanent linear change (1500℃×2h) % | +0.1~-0.4 | +0.1~-0.4 | +0.1~-0.4 | +0.1~-0.4 (1450℃) |
| Apparent porosity % | 23 | 23 | 22 | 22 |
| CCS MPa ≥ | 53.9 | 49 | 44.1 | 39.2 |
Frequently Asked Questions
What are the main features of high alumina bricks?
High alumina bricks offer high refractoriness, excellent thermal stability, good insulating properties, resistance to corrosion and abrasion, and low thermal conductivity.
What applications are high alumina bricks used for?
They are widely used in steel, cement, glass, and ceramics industries, specifically for masonry blast furnaces, hot blast stoves, electric furnace tops, and ladle permanent linings.
What is the refractoriness limit for LZ-75 high alumina bricks?
LZ-75 high alumina bricks have a refractoriness rating of ≥ 1790 ℃, allowing them to withstand extreme high-temperature environments.
How do high alumina bricks perform under rapid temperature changes?
They possess excellent thermal stability, which helps maintain their structural integrity and mechanical properties, significantly reducing the risk of thermal shock damage.
What is the Al2O3 percentage in different grades of these bricks?
The Al2O3 percentage varies by grade: LZ-75 contains ≥ 75%, LZ-65 contains ≥ 65%, LZ-55 contains ≥ 55%, and LZ-48 contains ≥ 48%.





