First Grade High Alumina Brick is a premium refractory material engineered for severe high-temperature and chemically aggressive environments. With an alumina (Al₂O₃) content of not less than 75%, this grade represents the upper tier of shaped alumina refractories, offering superior refractoriness, slag resistance, and long-term structural stability.
Designed for demanding industrial applications, Grade 1 high alumina bricks are widely used in steelmaking, non-ferrous metallurgy, cement kilns, energy systems, and waste incineration furnaces, where operational reliability and lining longevity are critical.
As a direct manufacturer, we supply stable-quality, customizable first grade high alumina bricks that meet international standards and project-specific requirements.
(1) High refractoriness
(2) High refractoriness under load
(3) Strong slag resistance
(4) High compressive strength
(5) Good stability
(6) Good wear resistance
(1) Iron and steel manufacturing industry: blast furnace, hot blast furnace, electric furnace, ladle, tundish, heating furnace, refining furnace, heating furnace, annealing furnace, cupola
(2) Nonferrous metal industry: smelting furnace, refining furnace, reverberatory furnace, converter furnace.
(3) Building materials industry: cement kiln, glass kiln, ceramic kiln, lime kiln, kiln car, tunnel kiln
(4) Energy and incineration: coke oven, circulating fluidized bed boiler, carbon roaster, incinerator.
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Item |
Index |
||||
|
Model |
SK35 |
SK36 |
SK37 |
SK38 |
SK39 |
|
Al2O3/% |
≥48 |
≥55 |
≥65 |
≥75 |
≥80 |
|
Fe2O3/% |
≤2 |
≤2 |
≤2 |
≤2 |
≤2 |
|
Body density（g/cm3） |
2.15 |
2.2 |
2.3 |
2.4 |
2.5 |
|
Refractory |
≥1750 °C |
≥1770 °C |
≥1790 °C |
≥1790 °C |
≥1790 °C |
|
Change in heating permanent line/% |
1450℃×2h -0.4~0.1 |
1450℃×2h -0.4~0.1 |
1450℃×2h -0.4~0.1 |
1500℃×2h -0.4~0.2 |
1500℃×2h -0.4~0.2 |
|
Cold pressing strength |
≥39Mpa |
≥44Mpa |
≥49Mpa |
≥54Mpa |
≥65Mpa |
|
Apparent porosity (≤) |
≤22% |
≤22% |
≤23% |
≤23% |
≤21% |
|
Load softening temperature [0.2MPa*0.6%]≥ |
≥1420 °C |
≥1470 °C |
≥1500 °C |
≥1520 °C |
≥1530 °C |
First Grade High Alumina Brick is a high-performance shaped refractory brick primarily composed of high-purity alumina, derived from carefully selected bauxite clinker. Compared with lower-grade alumina bricks, Grade 1 products contain a higher Al₂O₃ percentage (≥75%), which significantly enhances their thermal, mechanical, and chemical resistance properties.
This grade is specifically developed for high-load, high-temperature zones where ordinary fire clay bricks or medium-grade alumina bricks fail prematurely due to slag penetration, chemical attack, or thermal deformation.
In industrial furnace design, first grade high alumina bricks are often used as working lining materials, directly exposed to heat, molten metal, or corrosive gases.
The superior performance of first grade high alumina bricks is fundamentally determined by their controlled chemical composition:
High alumina content reduces glass-phase formation at high temperatures, ensuring structural stability and load-bearing capacity during prolonged service.
Our Grade 1 high alumina bricks are produced through a strict, multi-stage manufacturing process:
This controlled process ensures consistent performance, minimal variation, and reliable service life in industrial applications.
First grade high alumina bricks are selected for applications where failure is not an option. Their key advantages include:
With a high alumina matrix, these bricks maintain structural integrity under extreme heat and mechanical load, making them suitable for high-temperature furnace zones.
They demonstrate strong resistance to acidic and neutral slags, molten metals, and corrosive furnace atmospheres, reducing lining erosion.
Optimized microstructure allows the bricks to withstand repeated heating and cooling cycles without cracking.
Reduced wear, lower penetration, and stable volume contribute to extended furnace campaign life, lowering maintenance frequency.
Minimal deformation at high temperatures ensures tight joints and lining integrity throughout operation.
Typical technical parameters of first grade high alumina bricks include:
Custom specifications can be provided based on operating temperature, furnace design, atmosphere, and slag characteristics.
First grade high alumina bricks are widely used in steelmaking equipment exposed to high temperatures and slag attack, such as:
Their high refractoriness and corrosion resistance help ensure stable furnace operation and reduced downtime.
In aluminum, copper, and other non-ferrous metal processing, these bricks perform reliably in:
They resist molten metal penetration and chemical attack, supporting clean melts and longer lining life.
First grade high alumina bricks are commonly used in:
Their ability to withstand high temperatures and alkali-rich environments makes them suitable for critical kiln zones.
In energy recovery and waste treatment systems, these bricks are applied in:
They offer reliable performance under fluctuating temperatures and corrosive gases, improving operational safety.
Understanding the difference between alumina brick grades helps buyers select the right material:
| Grade | Typical Al₂O₃ Content | Recommended Use |
|---|---|---|
| Grade 1 | ≥75% | Severe high-temperature and corrosive zones |
| Grade 2 | 65–70% | Medium-duty furnace linings |
| Grade 3 | 55–60% | General-purpose refractory applications |
First grade high alumina bricks are chosen when performance, longevity, and reliability outweigh initial material cost considerations.
We are a direct refractory manufacturer, offering competitive pricing, stable supply, and full quality control.
Only qualified bauxite clinker and approved binders are used to ensure consistent chemical composition.
Our technical team provides material selection advice and custom brick design for different furnace conditions.
Our products are supplied to international markets and meet common global standards.
Each batch is tested to ensure it meets agreed specifications before shipment.
We focus on safe transportation and consistent delivery, ensuring products arrive ready for installation.
What alumina content defines a first grade high alumina brick?
First grade bricks typically contain not less than 75% Al₂O₃.
Where should first grade high alumina bricks be used?
They are recommended for high-temperature, high-load, and chemically aggressive furnace zones.
Can specifications be customized?
Yes. Sizes, shapes, and technical parameters can be adjusted based on project requirements.
Are these bricks suitable for steel furnaces?
Yes. They are widely used in steelmaking due to their high refractoriness and slag resistance.
How does Grade 1 compare with lower grades?
Grade 1 offers higher durability and performance, especially in severe operating conditions.
Selecting the correct refractory material is critical to furnace performance and service life.
Our engineering team is ready to assist you with technical consultation, specification selection, and pricing support.
👉 Contact us today to request a datasheet, quotation, or customized solution for your furnace project.
High alumina poly light brick is a high quality lightweight refractory material
High alumina poly light brick is a high quality lightweight refractory material.
Aluminum content 75%-80% Refractory 1770℃ or above
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
