Zircon Brick, also known as Zircon Refractory Brick or Zircon Silicate Brick, is a high-performance acidic refractory material manufactured primarily from natural zircon sand (ZrSiO₄). It is widely used in high-temperature industrial furnaces where excellent resistance to chemical corrosion, molten glass erosion, and thermal shock is required.
Bulk Density：3.6–4.3 g/cm³
Apparent Porosity： ≤17%
Cold Crushing Strength： ≥100 MPa
Refractoriness Under Load (0.2 MPa)： ≥1600°C
Thermal Shock Resistance： Excellent
Thermal Conductivity： Low
1. Excellent high temperature resistance
2. Outstanding resistance to glass melt and chemical corrosion
3. Low wettability to molten glass
4. Strong resistance to slag and chemical erosion
5. Good thermal shock resistance and volume stability
6. Long service life in severe operating conditions
Used for lining glass melting furnaces, including sidewalls, furnace bottoms, throats, and working ends. They are also widely applied in glass channels and forehearths, as well as in metallurgical furnaces, chemical kilns, and other high-temperature industrial equipment where strong resistance to molten glass, chemical corrosion, and thermal shock is required.
| Index | A type Aggregate | B type Ordinary |
| ZrO₂ / % | ≥65 | ≥65 |
| SiO₂ / % | ≤33 | ≤33 |
| Fe₂O₃ / % | ≤0.2 | ≤0.2 |
| Bulk Density / g·cm⁻³ | ≥3.80 | ≥3.75 |
| Apparent Porosity / % | ≤17 | ≤17 |
| Cold Crushing Strength / MPa | ≥100 | ≥80 |
| Refractoriness under Load (0.2 MPa, T0.6) / °C | ≥1680 | ≥1650 |
Zircon Brick, also known as Zircon Refractory Brick or Zircon Silicate Brick, is a high-performance acidic refractory material manufactured primarily from natural zircon sand (ZrSiO₄). It is widely used in high-temperature industrial furnaces where excellent resistance to chemical corrosion, molten glass erosion, and thermal shock is required.
Due to its unique crystal structure and high zirconia content, zircon brick exhibits outstanding thermal stability, low wettability to molten glass, and long service life under severe operating conditions. These properties make zircon bricks an ideal lining material for glass furnaces, metallurgical furnaces, and other high-temperature industrial equipment.
Zircon bricks are engineered using carefully selected zircon sand with controlled impurity levels to ensure consistent performance in demanding environments.
Typical Chemical Composition:
ZrO₂: 60–68%
SiO₂: 30–35%
Al₂O₃: ≤1.5%
Fe₂O₃: ≤0.3%
The high zirconia content provides exceptional corrosion resistance and structural stability, while silica contributes to thermal integrity and compatibility with acidic furnace atmospheres.
The superior performance of zircon brick is reflected in its balanced physical and thermal characteristics.
| Property | Typical Value |
| Bulk Density | 3.6–4.3 g/cm³ |
| Apparent Porosity | ≤17% |
| Cold Crushing Strength | ≥100 MPa |
| Refractoriness Under Load (0.2 MPa) | ≥1600°C |
| Thermal Shock Resistance | Excellent |
| Thermal Conductivity | Low |
Why these properties matter:
High bulk density ensures strong resistance to molten material penetration.
Low apparent porosity reduces slag and glass infiltration.
High mechanical strength maintains structural integrity under load.
Stable RUL guarantees reliable performance in continuous high-temperature operation.
Zircon brick shows extremely low wettability to molten glass, significantly reducing erosion and contamination. This property is critical in glass furnace applications where product purity and furnace life are essential.
With a high melting point and excellent load-bearing capacity at elevated temperatures, zircon bricks maintain dimensional stability even in prolonged high-temperature service.
The dense microstructure and stable crystal phases allow zircon bricks to withstand rapid temperature fluctuations without cracking or spalling.
Compared with conventional alumina-based refractories, zircon bricks offer longer operational cycles, reduced maintenance frequency, and lower overall lifecycle costs.
Low thermal conductivity helps minimize heat loss, improving furnace energy efficiency and reducing operating costs.
Zircon bricks are extensively used in the glass industry due to their excellent resistance to glass corrosion and minimal contamination.
Typical application areas include:
Glass furnace sidewalls
Furnace bottoms
Throats and working ends
Glass channels and forehearths
They are particularly suitable for soda-lime glass, borosilicate glass, and technical glass furnaces.
In metallurgical processes, zircon bricks are used in areas exposed to high temperatures and corrosive slags, such as:
Ladle linings
Non-ferrous metal melting furnaces
Continuous casting zones
Their chemical stability ensures reliable performance in harsh metallurgical environments.
Zircon refractory bricks are also applied in:
Chemical kilns
High-temperature reactors
Special industrial furnaces requiring acid-resistant linings
Designed for general high-temperature applications requiring excellent corrosion resistance and dimensional stability.
Typical uses: glass furnace sidewalls and bottoms.
A composite refractory combining zircon and mullite phases, offering enhanced thermal shock resistance and improved mechanical strength.
Recommended for: areas with frequent temperature fluctuations.
Enhanced with high-purity alumina, zircon corundum bricks provide superior abrasion resistance and load-bearing capacity.
Suitable for: extreme thermal and mechanical stress zones.
A cost-effective solution with moderate zircon content, balancing performance and budget requirements.
| Property | Zircon Brick | High Alumina Brick | AZS Brick |
| Corrosion Resistance | Excellent | Medium | Excellent |
| Glass Wettability | Very Low | Higher | Very Low |
| Thermal Shock Resistance | Good | Medium | Medium |
| Cost Efficiency | High | High | Lower |
| Typical Application | Glass furnaces | General kilns | High-end glass furnaces |
Zircon brick offers a balanced combination of performance and cost, making it a preferred choice for many industrial furnace applications.
When selecting zircon bricks, consider the following factors:
Operating Temperature – Continuous and peak temperatures
Furnace Atmosphere – Glass type, slag chemistry, acidity
Installation Zone – Sidewall, bottom, throat, or channel
Thermal Cycling – Frequency and severity of temperature changes
Mechanical Load – Structural stress during operation
Professional technical support and proper material selection can significantly extend furnace service life.
High-quality zircon bricks are produced through a strict manufacturing process:
Raw material selection and purification
Precise batching and mixing
High-pressure forming
High-temperature sintering
Dimensional machining and inspection
Each step is carefully controlled to ensure consistent product quality and performance.
Comprehensive quality control measures include:
Chemical composition analysis
Bulk density and porosity testing
Cold crushing strength testing
Thermal performance evaluation
All products are inspected to meet international refractory standards before delivery.
Customized solutions are available to meet specific furnace designs and operating conditions:
Customized sizes and shapes
Adjusted chemical compositions
Application-based performance optimization
Technical engineers work closely with clients to deliver optimal refractory solutions.
With extensive experience supplying zircon refractory bricks to international markets, reliable logistics and technical support ensure smooth project execution for customers worldwide.
Q1: What is the difference between zircon brick and AZS brick?
Zircon brick is sintered and cost-effective, while AZS brick is fused-cast and typically used in ultra-high-end glass furnace zones.
Q2: Is zircon brick suitable for glass furnace sidewalls?
Yes, zircon brick is one of the most commonly used materials for glass furnace sidewalls due to its excellent corrosion resistance.
Q3: Can zircon bricks be customized?
Yes, dimensions, compositions, and performance parameters can be customized according to application requirements.
Q4: What is the typical service life of zircon brick?
Service life depends on operating conditions but is generally longer than standard alumina refractories.
If you are looking for a reliable Zircon Brick manufacturer or supplier, our technical team is ready to assist you with product selection, customization, and competitive quotations.
👉 Contact us today to get expert support and detailed technical data.
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