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Zero Expansion Silica Brick (Fused Silica Brick) - High Purity from China Suppliers and Factory for Industrial Applications

Introducing our Zero Expansion Silica Brick (fused silica brick) from China, a top-tier product designed for high-heat industrial applications. As one of the leading suppliers and manufacturers in the industry, our bricks feature a near-zero thermal expansion coefficient, outstanding heat shock resistance, and exceptional refractoriness. Constructed from high-purity silica, they can withstand extreme temperatures and frequent thermal fluctuations without cracking. Perfect for glass kilns, ceramic furnaces, and metallurgical equipment, our Zero Expansion Silica Brick enhances equipment stability and minimizes maintenance needs, making it an indispensable choice for any high-temperature operation. Trust our factory to provide you with the best refractory materials for your industrial requirements

Item: Zero-expansion Silica Bricks

Product Details

Core Advantages

Near-Zero Thermal Expansion

Features a thermal expansion coefficient of ≤0.1×10⁻⁶/°C, avoiding deformation or cracking caused by rapid temperature fluctuations, ensuring structural stability in cyclic high-heat environments.

Superior Heat Shock Resistance

Excels in withstanding repeated heating and cooling cycles (1100°C water quench ≥30 times), far outperforming ordinary refractory bricks, suitable for equipment with frequent temperature changes.

High Refractoriness & Durability

Crafted with high-purity silica (SiO₂≥98%), it maintains integrity at up to 1750°C, resisting erosion from acidic media and furnace dust, extending service life significantly.

Excellent Structural Stability

Dense texture ensures strong compression resistance and low porosity, preventing gas penetration and furnace leakage, enhancing overall equipment operational safety.

Product Parameters

Item	Calcium-free Silica Brick	Zero-expansion Silica Brick (Fused Silica Brick)
SiO₂ %	≥97	≥98
Al₂O₃ %	≤1.1	≤0.2
CaO %	≤0.05	≤0.01
Fe₂O₃ + TiO₂ %	≤0.1	≤0.1
Bulk Density (g/cm³)	≥1.88	≥1.85
Apparent Porosity (%)	≤17	≤16
Cold Crushing Strength (MPa)	≥35	≥40
Refractoriness Under Load ℃ (0.2MPa, 0.6%)	≥1690	≥1680
Thermal Shock Stability (1100℃ cooling, times)	>30	>30

Detailed Application Scenarios

Glass Industry

◎ Widely used in regenerators, checker chambers, and throat areas of glass melting furnaces. Its zero expansion property resists thermal shock from alternating heating/cooling, ensuring furnace tightness and stable glass production quality.

Ceramic & Porcelain Industry

◎ Applied in the firing zone and cooling zone of ceramic kilns. Withstands frequent temperature cycles during ceramic sintering, preventing kiln body damage and improving product yield.

Metallurgical Industry

◎ Suitable for lining of coke ovens, blast furnace hot blast stoves, and non-ferrous metal smelting furnaces. Resists erosion from high-temperature gas and acidic slag, maintaining furnace structure integrity.

Other High-Temp Equipment

◎ Ideal for waste incinerator linings, chemical reactor chambers, and thermal power plant boiler partitions. Provides reliable refractory protection in harsh environments with extreme temperature variations.

Conclusion

Frequently Asked Questions

What is a zero-expansion silica brick (fused silica brick)? +

A zero-expansion silica brick, also known as a fused silica brick, is a high-performance refractory product made from high-purity fused silica (SiO₂ ≥98%). It is characterized by an extremely low thermal expansion coefficient (≤0.1×10⁻⁶/°C), excellent thermal shock resistance, and the ability to maintain structural integrity at temperatures up to 1750°C. These properties make it ideal for use in high-temperature industrial furnaces and kilns.

What is the maximum operating temperature for zero-expansion silica bricks? +

Zero-expansion silica bricks can withstand continuous operating temperatures up to 1750°C. Their refractoriness under load (0.2 MPa, 0.6%) reaches ≥1680°C, making them suitable for the most demanding high-temperature industrial applications, including glass melting furnaces, coke ovens, and metallurgical smelting equipment.

How does thermal shock resistance compare between calcium-free and zero-expansion silica bricks? +

Both calcium-free silica bricks and zero-expansion (fused) silica bricks demonstrate outstanding thermal shock stability, each rated at more than 30 cycles at 1100°C water quench testing. This far exceeds the performance of standard refractory bricks, making both product types highly suitable for equipment that undergoes frequent and rapid temperature changes.

What industries are silica bricks most commonly used in? +

Silica bricks are widely used across multiple high-temperature industries. Key application sectors include the glass industry (regenerators, checker chambers, furnace throats), ceramic and porcelain industry (kiln firing and cooling zones), metallurgical industry (coke ovens, blast furnace hot blast stoves, non-ferrous smelting furnaces), as well as waste incinerators, chemical reactors, and thermal power plant boilers.

What is the difference between calcium-free silica bricks and zero-expansion silica bricks? +

The primary differences lie in purity and performance parameters. Zero-expansion (fused) silica bricks have a higher SiO₂ content (≥98% vs ≥97%), lower CaO content (≤0.01% vs ≤0.05%), lower Al₂O₃ content (≤0.2% vs ≤1.1%), and higher cold crushing strength (≥40 MPa vs ≥35 MPa). The zero-expansion grade offers superior dimensional stability and is preferred for the most critical, precision-demanding applications.

Can silica bricks resist chemical erosion from acidic environments? +

Yes. Due to their high SiO₂ purity and dense microstructure, both calcium-free and zero-expansion silica bricks exhibit excellent resistance to erosion from acidic media, acidic slag, and furnace dust. Their low apparent porosity (≤16–17%) effectively prevents gas penetration and liquid infiltration, ensuring long-term structural integrity even in chemically aggressive furnace environments.