Highland Refractory, a trusted supplier of premium AZS Refractory Brick, offers high-performance AZS Brick—engineered from zirconia-alumina-silica (ZrO₂-Al₂O₃-SiO₂) composites for extreme high-temperature and corrosive environments. Our product line includes AZS 33 brick (33% ZrO₂ content), AZS 36 brick (36% ZrO₂), and AZS 41 brick (41% ZrO₂), each designed to withstand continuous operating temperatures up to 1800℃ with exceptional thermal shock resistance and corrosion resistance against molten glass, slags, and acids.
（1）Exceptional corrosion resistance against molten glass, slags, and chemical media
（2）High ZrO₂ content (33-41%) for superior high-temperature stability (up to 1800℃ continuous service)
（3）Dense fused cast structure with low porosity (≤3%) and high bulk density (3.6-3.8 g/cm³)
（4）Strong wear resistance to prolong service life in high-traffic industrial applications
（5）Non-toxic and environmentally friendly, compliant with global refractory safety standards
（1）Glass furnace pool walls, feeder channels, and spout linings
（2）Chemical melting reactor linings and molten salt crucible linings
（3）Metallurgical ladle linings and secondary refining furnace components
（4）Special high-temperature furnace linings (ceramic sintering, electronic component annealing)
（5）Tin bath linings for float glass production lines
（6）Corrosion-resistant linings for acid-alkali high-temperature pipelines and valves
| Item | Fused Cast AZS Brick | AZS33 | AZS36 | AZS41 |
| Chemical Composition (%) | Al₂O₃ | ≥50.00 | ≥49.00 | ≥45.00 |
| ZrO₂ | ≥32.50 | ≥35.50 | ≥40.50 | |
| SiO₂ | ≤15.00 | ≤13.50 | ≤12.50 | |
| Na₂O + K₂O | ≤1.30 | ≤1.35 | ≤1.30 | |
| Volume Density (g/cm³) | ≥3.75 | ≥3.85 | ≥4.00 | |
| Apparent Porosity (%) | ≤1.2 | ≤1.0 | ≤1.2 | |
| Cold Crushing Strength (MPa) | ≥200 | ≥200 | ≥200 | |
| Exudation Temperature of Glass Phase (°C) | ≥1400 | ≥1400 | ≥1410 | |
| Bubble Separation Ratio (1300°C × 10h) | (%) | ≤1.2 | ≤1.0 | ≤1.0 |
| Anti-corrosion Rate of Glass Liquid (1500°C × 36h) | (mm/24h) | ≤1.4 | ≤1.3 | ≤1.2 |
| Bulk Density (g/cm³) | Ordinary Casting PT (RN / RC / N) | ≥3.55 | ≥3.55 | ≥3.70 |
| No Shrinking Casting ZWS (RR / EVF / EC / ENC) | ≥3.65 | ≥3.75 | ≥3.85 | |
| Tilt Casting QX (RO) | ≥3.65 | ≥3.75 | ≥3.90 | |
| No Shrinkage Casting WS (RT / VF / EPIC / FVP / DCL) | ≥3.75 | ≥3.80 | ≥3.95 |
Fused cast AZS brick is a high-quality refractory material widely used in glass furnaces, steel ladles, and chemical kilns. With excellent corrosion resistance, thermal stability, and long service life, AZS bricks are an ideal solution for industries that operate at extremely high temperatures and under aggressive chemical environments. Highland Refractory provides a full range of AZS bricks, including AZS33, AZS36, and AZS41, tailored for specific industrial applications.
AZS brick, also known as fused cast alumina-zirconia-silica brick, is composed primarily of Al₂O₃ (Alumina), ZrO₂ (Zirconia), and SiO₂ (Silica). This unique composition gives the brick high corrosion resistance, low thermal expansion, and excellent thermal shock performance. Unlike conventional high alumina bricks, AZS bricks are specifically engineered for glass melting furnaces and other high-temperature industrial applications where chemical attack and thermal stress are common.
Key features of AZS bricks include:
High-temperature corrosion resistance: withstands molten glass and other aggressive melts
Excellent thermal shock stability: reduces cracking risk during rapid temperature changes
Low wear rate: extends service life and reduces maintenance costs
AZS bricks are categorized by their zirconia content, which affects their corrosion resistance and mechanical strength:
| Type | Al₂O₃ (%) | ZrO₂ (%) | SiO₂ (%) | Primary Use |
| AZS33 | 54–57 | 33 | 10–13 | Glass furnaces, general industrial kilns |
| AZS36 | 51–54 | 36 | 10–13 | Molten glass contact areas, high corrosion zones |
| AZS41 | 46–49 | 41 | 10–13 | Critical areas in glass furnaces requiring highest corrosion resistance |
Note: Higher ZrO₂ content increases chemical resistance but slightly reduces refractoriness under load (ROL).
| Property | AZS33 | AZS36 | AZS41 |
| Density (g/cm³) | 3.65 | 3.68 | 3.70 |
| Refractoriness (°C) | 1780 | 1770 | 1760 |
| Modulus of Rupture (MPa) | 35 | 37 | 40 |
| Thermal Expansion (%) | 0.5 | 0.5 | 0.5 |
| Service Temperature (°C) | 1550 | 1550 | 1550 |
Advantages over conventional bricks: Compared to high alumina bricks or silicon carbide bricks, AZS bricks combine higher corrosion resistance, longer service life, and better performance in glass contact zones.
Fused cast AZS bricks are widely used in industries that require high chemical and thermal resistance:
Glass Furnaces
AZS bricks line the hearth, throat, and forehearth of glass melting furnaces
Resists corrosion from molten glass, extends furnace life
Steel Industry
Used in ladles and continuous casting tundishes
Protects against molten steel erosion and thermal shock
Chemical Industry
Suitable for alkaline melt tanks and high-temperature reactors
Provides excellent resistance to aggressive chemical attacks
Ceramic & Kiln Industry
High thermal stability makes AZS bricks ideal for ceramic kiln linings
When selecting refractory materials for high-temperature industrial applications, it is important to understand the differences between AZS bricks and other commonly used refractory bricks, including High Alumina Brick, Fire Clay Brick, and Magnesia Carbon Bricks. The comparison focuses on temperature resistance, chemical stability, mechanical strength, and application scenarios.
| Brick Type | Max Service Temperature | Chemical Resistance | Best Applications | Key Advantages |
| AZS Brick | 1550–1600°C | Excellent against molten glass, moderate acids | Glass furnace lining, steel ladle, chemical kilns | High corrosion resistance, thermal shock stability, long service life |
| High Alumina Brick | 1700–1800°C | Good resistance to slag and general chemical attack | Steel industry, cement rotary kilns, hot blast stoves | High refractoriness, good mechanical strength, widely available |
| Fire Clay Brick | 1500–1600°C | Moderate resistance to acids and alkalis | Heating furnace linings, general industrial kilns | Cost-effective, easy to install, suitable for less aggressive environments |
| Magnesia Carbon Brick | 2000°C | Excellent against basic slags (steel ladle, converters) | Steel ladle linings, converter linings, electric arc furnaces | High thermal conductivity, strong mechanical strength, excellent slag resistance |
Key Insights:
Temperature Range:
AZS bricks offer excellent chemical resistance at medium-high temperatures (~1550°C) but cannot match the maximum refractory temperatures of high alumina or magnesia carbon bricks.
Magnesia carbon bricks are ideal for extreme temperatures (up to 2000°C), especially in basic slag conditions in steelmaking.
Chemical Resistance:
AZS bricks excel in molten glass environments, whereas high alumina bricks are suitable for general acidic or neutral slags.
Magnesia carbon bricks are preferred for basic slag-rich conditions such as steel ladles and converters.
Application Scenarios:
AZS bricks are specifically engineered for glass furnaces and chemical kilns.
High alumina bricks cover steel, cement, and hot blast stoves.
Fire clay bricks are suitable for general industrial heating applications where corrosion is less severe.
Magnesia carbon bricks dominate steelmaking furnaces with extreme thermal and chemical demands.
Selecting the proper AZS brick depends on several factors:
Corrosion environment: Higher ZrO₂ content (AZS41) is preferred for zones with aggressive chemical attack
Temperature exposure: Ensure the brick can withstand the furnace’s operating temperature
Mechanical stress: Consider the load and wear conditions
Service life requirements: Choose the grade that balances cost and longevity
Guidelines:
AZS33 – General purpose areas, standard corrosion resistance
AZS36 – Critical glass contact zones, moderate corrosion
AZS41 – Maximum corrosion resistance, highly aggressive environments
Contact our experts for AZS brick selection guidance
Proper installation and maintenance significantly affect AZS brick performance:
Pre-installation inspection: Check for cracks or defects
Joint preparation: Use suitable refractory mortar to avoid gaps
Correct placement: Ensure alignment and tight joints
Temperature ramp-up: Avoid rapid heating to minimize thermal shock
Regular inspection: Replace worn bricks to prevent further damage
Q1: What is the difference between AZS brick and fused silica brick?
A: AZS brick contains alumina and zirconia, providing higher corrosion resistance, whereas fused silica brick is primarily SiO₂ and has lower thermal expansion but lower chemical resistance.
Q2: Can AZS brick be used in steel ladles?
A: Yes, AZS bricks are suitable for ladles, tundishes, and other high-temperature steel processing applications.
Q3: How long does an AZS brick last in a glass furnace?
A: Depending on the grade and operating conditions, service life can range from 18 months to over 3 years.
Q4: Are AZS bricks customizable?
A: Highland Refractory provides customized sizes and grades to match specific furnace designs.
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Highland Refractory offers:
ISO & CE-certified products
Full range of AZS bricks (33, 36, 41)
Custom brick sizes and grades
Global supply and fast delivery
Technical support & case studies
We have supplied AZS bricks to glass, steel, chemical, and ceramic industries worldwide, ensuring high-quality materials and reliable service.
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High alumina fine powder is a powder material with alumina (Al2O3) as the main component.
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