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China Silica Brick Suppliers - High-Quality Refractory Factory for Industrial Furnaces
Core Advantages
High Silicon Content & Premium Purity
SiO₂ content ranges from 94% to 96%, with extremely low harmful impurities (Fe₂O₃ ≤1.5%). The high purity ensures excellent refractory performance and minimizes pollution to molten materials such as glass liquid.
Exceptional High-Temperature Resistance
Load softening temperature reaches 1640–1680℃, close to the melting point of tridymite and cristobalite. It can maintain structural integrity and no deformation under long-term high-temperature and high-load conditions.
Strong Acid Corrosion Resistance
As an acidic refractory material, it has strong resistance to acid slag and acidic gas erosion, and performs significantly better than clay bricks and ordinary high-alumina bricks in acidic working environments.
Stable High-Temperature Volume
After special firing process, the main mineral composition is tridymite and cristobalite. The residual expansion is small (0–0.2% at 1450℃×2h), which can make the masonry joints tight and ensure good airtightness.
Excellent Thermal Conductivity
Thermal conductivity is higher than that of clay bricks and high-alumina bricks, which is conducive to rapid heat storage and heat release of furnace equipment, improving energy utilization efficiency.
Product Parameters
| Item | Silica Brick | |||
|---|---|---|---|---|
| BG-94 | BG-95 | BG-96A | BG-96B | |
| SiO₂ % | ≥94 | ≥95 | ≥96 | ≥96 |
| Fe₂O₃ % | ≤1.50 | ≤1.50 | ≤0.80 | ≤0.70 |
| Apparent Porosity % | ≤22 | ≤21 | ≤21 | ≤21 |
| True Density g/cm³ | ≤2.38 | ≤2.38 | ≤2.34 | ≤2.34 |
| Cold Crushing Strength MPa | ≥25 | ≥29 | ≥35 | ≥35 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1630 | ≥1650 | ≥1680 | ≥1680 |
Detailed Application Scenarios
Coke Oven Application
◎ Silica brick is the core refractory material for modern large-scale coke ovens, which is used in key parts such as regenerator walls, slopes, carbonization chamber bottoms, furnace walls, and furnace tops. Coke ovens need to operate continuously at 950–1050℃ for dry distillation of coal. The high temperature resistance, stable volume, and good thermal conductivity of silica brick can increase the temperature of the combustion chamber, shorten the coking time, improve the production capacity of the coke oven, and extend the service life of the coke oven to more than 20 years. It is especially suitable for large coke ovens with carbonization chamber height above 6m.
Glass Furnace Application
◎ Silica brick is the most widely used and important brick type in float glass furnaces, mainly used in the melting section, working section roof swan, breast wall, front and rear end walls, regenerator top swan, and regenerator upper partition wall. The glass furnace gas temperature can reach above 1615℃, and the silica brick can withstand gravity, mechanical stress and high temperature load. It has slight erosion after absorbing a small amount of alkali components, which will not reduce the structural strength of the furnace top. At the same time, its low impurity content (Fe₂O₃ ≤0.8%) can avoid polluting the glass liquid and ensure the quality of glass products.
Hot Blast Furnace Application
◎ Silica brick is used for masonry of high-temperature parts of blast furnace hot blast furnaces. Under the working conditions of long-term high temperature and high air pressure, it has stable volume and low creep rate, and can be used continuously for 1–2 blast furnace generations. Its excellent thermal conductivity is conducive to rapid heat storage and heat release, improving the temperature of hot air and the thermal efficiency of the blast furnace. It is suitable for the high-temperature bearing parts of hot blast furnaces and acidic blast furnace tops.
We provide customized services for different furnace types and working conditions to meet the personalized needs of customers. With professional R&D team and after-sales service system, we are committed to providing customers with high-quality silica brick products and comprehensive technical support.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
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What is the SiO₂ content of your silica bricks, and why does it matter?Our silica bricks contain 94%–96% SiO₂ depending on the grade (BG-94, BG-95, BG-96A, BG-96B). A higher SiO₂ content means lower impurity levels — especially Fe₂O₃ — which directly reduces contamination of molten glass or metal and improves overall refractory performance at elevated temperatures.
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What is the maximum operating temperature for your silica bricks?Our premium grades (BG-96A and BG-96B) have a Refractoriness Under Load (0.2 MPa, 0.6%) of ≥1680℃. Even the standard BG-94 grade maintains structural integrity at ≥1630℃, making all grades suitable for continuous high-temperature industrial furnace operation.
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Which industries are silica bricks most commonly used in?Silica bricks are primarily used in three major industries: (1) Coke ovens — for regenerator walls, carbonization chambers, and furnace tops; (2) Float glass furnaces — for melting sections, roof arches, breast walls, and regenerator partitions; (3) Hot blast furnaces in steel plants — for high-temperature bearing zones and acidic blast furnace tops.
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How do silica bricks compare to clay bricks and high-alumina bricks?Silica bricks outperform clay bricks and standard high-alumina bricks in three key areas: (1) Acid corrosion resistance — silica is an acidic refractory with superior resistance to acid slag and acidic gases; (2) Thermal conductivity — faster heat storage and release improves furnace efficiency; (3) High-temperature volume stability — minimal residual expansion (0–0.2% at 1450℃) keeps masonry joints tight and airtight.
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Can silica bricks be customized for specific furnace types or dimensions?Yes. We offer full customization services tailored to different furnace types, working conditions, and dimensional requirements. Our professional R&D team will assess your specific application — whether it is a large coke oven with a carbonization chamber above 6m or a specialized glass furnace — and recommend the most suitable grade and shape.
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What is the expected service life of silica bricks in a coke oven?When correctly installed and operated, silica bricks can extend the service life of a coke oven to more than 20 years. Their stable high-temperature volume, low creep rate, and excellent thermal conductivity contribute to sustained structural integrity even under continuous 950–1050℃ dry distillation cycles. For hot blast furnaces, silica bricks typically serve 1–2 full blast furnace generations.