High Alumina Bricks Specifications
All high alumina fire bricks are manufactured in strict accordance with Chinese national standard GB/T 2988 and tested batch by batch. In particular, REBO supplies the following standard grades: LZ series (classified by Al₂O₃ content) and SK series (classified by national standard). Two types together cover a wide range of application temperatures and service conditions. Standard refractory bricks specifications are available upon request.
| Item | LZ-80 | LZ-75 | LZ-70 | LZ-65 | LZ-60 | LZ-55 | LZ-48 | |
|---|---|---|---|---|---|---|---|---|
| Al2O3, /% | ≥ | 80 | 75 | 70 | 65 | 60 | 55 | 48 |
| Apparent Porosity, % | ≤ | 21 | 24 | 24 | 24 | 26 | 22 | 22 |
| Cold Crushing Strength, MPa | ≥ | 70 | 60 | 55 | 50 | 45 | 45 | 40 |
| 0.2MPa Refractoriness Under Load, ℃ | ≥ | 1530 | 1520 | 1510 | 1500 | 1430 | 1450 | 1420 |
| Permanent Linear Change, % | 1500℃*2h -0.4~0.2 |
1450℃*2h -0.4~0.1 |
||||||
| Item/Grade | SK-36 | SK-38 | |
|---|---|---|---|
| Al2O3, /% | 48-55% | 65-70% | |
| Fe2O3, % | 2.5 | 2.3 | |
| Apparent Porosity, % | 22 | 20 | |
| Bulk Density, g/cm³ | 2.2-2.25 | 2.25-2.35 | |
| Cold Crushing Strength, MPa | ≥ | 45 | 50 |
| Refractoriness underload, 0.2MPa, °C | ≥ | 1380 | 1400 |
| Refractoriness | ≥ | 1780 | 1810 |
| Thermal Expansion at 1000℃(%) | ≤ | 0.4 | 0.4 |
Types of REBO High Alumina Bricks
From standard SK-grade high alumina lining bricks to custom-engineered solutions, REBO supplies the full range of high alumina firebricks for steel, cement, glass, and non-ferrous metal industries. Specifically, Al₂O₃ content ranges from 40% to 99%, including popular options such as the 70 alumina fire brick. With that in mind, find your match below. This is the popular standard size:
- 230*114*65mm (International Standard);
- 230*114*75mm (Thickened);
- 230*114*55mm (Thinned).
By Alumina Content and Function
60-80% Al₂O₃ High Alumina Bricks
SK-Grade High Alumina Refractory Bricks
Spalling-Resistant Refractory Bricks
Lightweight Insulating Refractory Bricks
Phosphate-Bonded High Alumina Bricks
Low Creep High Alumina Bricks
By Shaped & Application-specific
In addition to the products shown above, we offer high alumina bricks customized by industry and shape:
- By Industry: High alumina bricks for cement, high alumina bricks for blast furnace, high alumina bricks for glass furnace, high alumina bricks for VOD, high alumina bricks for AOD, high alumina bricks for hot blast stove, refining ladle, high alumina bricks for submerged arc furnace, high alumina bricks for heating furnace, high alumina bricks for lime ratary kiln, etc.
- By Standard: T/Y/G series, ISO Standard & VDZ Shapes.
- By Shape: Wedge bricks, arch bricks, key bricks, skew bricks, checker bricks, anchor bricks, etc.
Arch High Alumina Refractory Bricks
Anchor High Alumina Refractory Bricks
Curved High Alumina Refractory Bricks
Steel Ladle High Alumina Bricks
Checker High Alumina Refractory Bricks
Lining High Alumina Refractory Bricks
Special-shaped High Alumina Bricks for Customers
- Special Shapes: Non-standard refractory shapes designed for unique structural layouts.
- Custom Engineering: Customize high alumina bricks built strictly according to your drawings and kiln operating conditions.
High Alumina Refractory Bricks Across Various Industries
REBO high alumina refractory bricks are installed in kilns, furnaces, and ladles worldwide. In particular, below are the key application scenes and real-world results from our customers. To illustrate, the application examples below represent real installations and feedback from our global customers engineers and procurement teams who chose REBO for both technical reliability and competitive factory high alumina bricks price.
Steel & Metallurgy
Requires bricks with high slag resistance and thermal shock stability under rapid temperature swings.
Direct contact with molten steel. Demands high density, low porosity, and erosion resistance.
Cement Industry
Subject to mechanical stress, alkali attack, and continuous rotation. Spalling resistance is critical.
High dust erosion and abrupt temperature changes demand abrasion-resistant, thermally stable bricks.
Glass & Ceramics
Checker bricks must resist alkali vapour, thermal cycling, and maintain heat exchange efficiency over 5–8 year campaigns.
Long continuous operation at 1300–1400°C. Dimensional precision matters for tight stacking and kiln car flatness.
Non-ferrous Metals
Must resist aluminum penetration and molten metal corrosion. Phosphate-bonded grades preferred.
High-temperature oxidizing atmosphere combined with slag attack demands high Al₂O₃ content and dense structure.
Continuous operation under mechanical load and CO₂-rich atmosphere. Abrasion and thermal stability are paramount.
Similar demands to cement kilns but with stronger abrasive wear from lime particles.
Global Heavy Industries Rely on REBO High Alumina Lining Bricks
Unplanned kiln shutdowns and premature refractory failure cost industrial plants thousands of dollars per hour. REBO doesn’t just supply high alumina fire bricks. We engineer complete thermal lining reliability.
Backed by vertical raw material control, advanced automated production, and rigorous thermal-shock engineering, REBO high alumina bricks are built to withstand extreme mechanical stress, harsh chemical slag, and intense operational temperatures. Whether you are relining a cement rotary kiln, blast furnace, or glass tank, our factory-direct manufacturing delivers the exact dimensional precision, thermal stability, and batch-to-batch consistency your large-scale projects demand.
Premium Raw Materials
REBO uses selected high-grade alumina clinker and bonded clay sourced and tested before entering production. No compromises at the start means no failures at the furnace.
Al₂O₃ ≥ 30%
High-Temperature Sintering
All bricks are fired at 1500-1600°C in our 168-meter natural gas tunnel kilns, ensuring a dense, uniform microstructure and consistent refractoriness above 1420°C.
2×168m tunnel kilns
Batch-By-Batch Quality Control
Every production batch goes through incoming raw material testing, in-process checks, and outgoing inspection. You receive a full quality report with each shipment not just a certificate.
Third-party reports available
Industrial-Scale Production
With 400–1000T hydraulic presses, we maintain tight dimensional tolerances across high-volume orders critical for large furnace lining projects where brick consistency directly affects service life.
Mass production and custom sizes supported
Proven Thermal Stability
High thermal shock resistance and excellent load-bearing performance at temperature mean fewer unplanned shutdowns whether in electric arc furnaces, glass tanks, or cement rotary kilns.
Physical chemistry laboratory for testing
Technical Support Included
Not sure which grade fits your operating conditions? REBO engineering team reviews your furnace type, temperature, and atmosphere and recommends the right specification at no extra cost.
Free consultation
High Alumina Bricks Properties
Ensure zero structural collapse in extreme high-temperature zones.
Superior Load-Bearing Capacity
Maintain high hot-strength under heavy continuous mechanical stress.
Slag & Corrosion Resistance
Effectively resist harsh acidic/alkaline slag and chemical erosion.
Extended Service Life
Delivers 2–3x longer lifespan than standard fireclay bricks, drastically reducing downtime and maintenance costs.
Dense micro-structure stops slag penetration and gas leakage.
Enhanced Thermal Shock Stability
Prevent spalling and cracking during rapid temperature changes.
High-Purity Al2O3 Formulations
Custom-engineered alumina content tailored precisely to your operational conditions.
REBO Precision Manufacturing
Backed by 4 automated tunnel kilns, ensuring strict batch-to-batch consistency for mega-scale projects.
Certificate for Global Procurement Standards
REBO holds ISO 9001, ISO 14001, and CE certifications, and furthermore, provides a full third-party test report (like SGS) with every shipment. As a result, our quality system is built to meet the high alumina brick supplier qualification standards of global industrial customers, so ultimately, your procurement team has everything they need, from day one.
Please see the third-party certification on REBO YouTube.
Related Products of High Alumina Refractory Bricks
FAQs About High Alumina Refractory Bricks
Q: Does Higher Al₂O₃ Content Always Mean Better Performance?
Q: What Is the Standard Size, And Can You Supply Custom Shapes?
Yes, beyond standard bricks, high alumina refractories are routinely manufactured in custom shapes for specific furnace positions.
