80 high alumina bricks, containing ≥80% Al₂O₃, are premium refractory materials designed to withstand extreme high-temperature industrial conditions. They are engineered for industrial furnace linings, including steel blast furnaces, cement rotary kilns, and non-ferrous metal furnaces.
With their high load softening temperature, excellent volume stability, and consistent structural integrity, these bricks provide a reliable solution for high-temperature zones that experience moderate thermal cycles. Highland Refractory, a trusted manufacturer in China, delivers 80 high alumina bricks with rigorous quality control and customizable specifications, ensuring long service life and optimal performance in demanding industrial environments.
80 high alumina brick is a type of high-performance refractory brick with Al₂O₃ content at or above 80%. These bricks belong to the higher end of the high alumina brick spectrum, offering superior thermal stability, compressive strength, and chemical resistance in high-temperature industrial environments.
Unlike lower-grade high alumina bricks, 80% Al₂O₃ bricks are ideal for high-temperature zones with relatively stable thermal loads. They are widely used in furnace walls, roofs, and working linings, where they provide structural stability and reduce maintenance intervals. However, they are not suitable for areas with rapid temperature fluctuations such as furnace doors, frequently opened feed ports, or cooling zones, due to moderate thermal shock resistance.
The performance of 80 high alumina brick is closely tied to its chemical composition and microstructure:
Alumina (Al₂O₃): ≥80%, providing the primary thermal resistance and load-bearing capacity.
Silica (SiO₂): Minor content, stabilizes mullite formation.
Iron oxide (Fe₂O₃) and other impurities: Controlled to ensure high refractoriness and chemical stability.
Microstructure: Composed of corundum grains embedded in a mullite matrix, offering high mechanical strength and low creep at elevated temperatures.
The precise chemical formulation ensures uniform structure, low apparent porosity, and excellent resistance to slag erosion, making Highland Refractory’s 80 high alumina bricks highly reliable for critical furnace components.
The following technical properties define the performance of 80 high alumina bricks:
| Property | Typical Value |
|---|---|
| Al₂O₃ Content | ≥80% |
| Bulk Density | ≥2.5 g/cm³ |
| Apparent Porosity | ≤20% |
| Cold Crushing Strength | ≥70 MPa |
| Refractoriness | ≥1850°C |
| Thermal Shock Resistance | Moderate |
Performance Highlights:
High Refractoriness: Resistant to temperatures above 1850°C, suitable for high-temperature working zones.
Load Softening Resistance: Maintains structural integrity under heavy load at high temperature.
Volume Stability: Low expansion reduces cracking and maintenance.
Chemical Resistance: Protects furnace linings from corrosion by fluxes and molten materials.
Moderate Thermal Shock Resistance: Suitable for zones with gradual temperature changes.
These properties make 80 high alumina brick a top choice for industrial furnaces where temperature is high but thermal cycles are moderate.
The production of 80 high alumina bricks follows stringent quality protocols to ensure consistent performance:
Raw Material Selection: High-purity bauxite and selected clay are used.
Mixing: Precise ratios ensure consistent Al₂O₃ content.
Shaping: High-pressure extrusion or pressing forms uniform brick shapes.
Drying: Controlled moisture removal prevents cracking.
High-Temperature Firing: Kiln firing at ~1700–1800°C develops a dense, stable microstructure.
Inspection & Packaging: Each batch is checked for density, porosity, and refractoriness before export-ready packaging.
Highland Refractory emphasizes quality at every step, ensuring that each brick meets both domestic and international industrial standards.
80 high alumina bricks are widely used in various industrial high-temperature zones:
Steel Blast Furnace: Furnace walls, roofs, and high-temperature working linings.
Cement Rotary Kilns: High-temperature sections, particularly in the sintering zone.
Glass Furnaces: Superstructure and high-temperature zones resistant to flux attack.
Non-Ferrous Metal Furnaces: Smelting and holding zones with high thermal load.
These bricks are ideal for applications requiring high refractoriness and structural stability, while avoiding locations with frequent thermal shocks or rapid cooling/heating cycles.
Providing clear technical specifications builds buyer confidence. A typical specification sheet includes:
| Category | Item | Specification |
|---|---|---|
| Brand | Brand | Highland Refractory |
| Chemical Composition (%) | Alumina (Al₂O₃) | ≥80 |
| Iron Oxide (Fe₂O₃) | ≤2.5 | |
| Physical Properties | Bulk Density (g/cm³) | ≥2.7-2.8 |
| Apparent Porosity (%) | ≤22 | |
| Cold Compressive Strength (MPa) | 70-80 | |
| Refractoriness Under Load at 0.2MPa (°C) | 1530 | |
| Service Temperature (°C) | 1750 | |
| Reheat Linear Change at 1500°C × 2h (%) | -0.4 |
Custom specifications are available upon request, including special shapes or sizes to fit unique furnace designs.
For industrial engineers, understanding the difference between high alumina grades is crucial:
| Feature | 70% Al₂O₃ | 75% Al₂O₃ | 80% Al₂O₃ |
|---|---|---|---|
| Refractoriness | ~1780°C | ~1820°C | ≥1850°C |
| Cold Crushing Strength | 60–65 MPa | 65–70 MPa | ≥70 MPa |
| Best Use | Moderate temperature zones | Medium-high temperature | High-temperature, working layer |
| Cost | Lower | Medium | Higher |
Key Takeaways:
80 high alumina brick is ideal for high-temperature working linings, providing superior performance but at a higher cost.
Lower-grade bricks may suffice for less demanding areas, offering cost savings.
High Load Softening Temperature: Ensures bricks maintain strength under furnace load.
Excellent Thermal Stability: Reduces cracking and maintenance frequency.
Long Service Life: Less frequent replacement saves time and cost.
Customizable: Available in various shapes and sizes to suit specific furnace designs.
Reliable Supply: Highland Refractory manufactures at scale with consistent quality, supporting industrial projects globally.
Selecting a supplier impacts furnace performance and operational costs:
Experience & Track Record: Choose manufacturers with years of industrial refractory experience.
Quality Control: Ensure consistent chemical composition, density, and firing process.
Export Capability: For international buyers, verify logistics, certifications, and compliance.
Technical Support: Manufacturers offering guidance on brick selection and installation reduce risks.
Highland Refractory stands out by offering customized solutions, global export experience, and strict quality assurance, making it a trusted choice for industrial clients.
Highland Refractory has been a leading high alumina brick manufacturer in China since 1990. Key advantages include:
Full-range high alumina brick production (including 70%, 75%, 80% grades)
Custom shapes & sizes for specific furnace linings
Global certification and competitive pricing
Dedicated technical support for industrial projects
Proven track record in steel, cement, glass, and non-ferrous metal industries
By choosing Highland Refractory, clients gain reliable, long-lasting refractory materials for high-temperature furnace linings.
Q1: What is the typical service life of 80 high alumina bricks?
A1: Depending on operating temperature and furnace conditions, service life ranges from 2 to 5 years in high-temperature working zones.
Q2: Can 80 high alumina brick be used in steel blast furnaces?
A2: Yes, it is ideal for high-temperature furnace walls and roofs with moderate thermal cycles. Avoid areas with rapid temperature changes.
Q3: Can Highland Refractory customize brick shapes?
A3: Yes, we provide special shapes and dimensions to match furnace designs.
Q4: How can I request a quotation?
A4: Contact Highland Refractory via email or phone, providing quantity, specifications, and delivery location.
80 high alumina bricks are a premium choice for high-temperature industrial furnaces, offering excellent refractoriness, structural stability, and long service life. They are best used in working linings and furnace zones with moderate thermal cycles.
By sourcing from Highland Refractory, industrial clients secure:
Reliable 80% Al₂O₃ bricks
Global-quality manufacturing
Customization to furnace requirements
Reduced downtime and maintenance cost
Contact Highland Refractory today for competitive pricing and technical consultation on 80 high alumina brick solutions for your industrial furnaces.
