Zhengzhou Zhongkeda Refractory Materials Co., Ltd
Silica Brick
Silica Bricks for High-Temperature Applications
Premium Refractory Solution for Coke Ovens, Glass Furnaces, and Hot Blast Stoves
Silica brick is an acidic refractory material primarily composed of silicon dioxide (SiO₂) with a content of ≥93%. It is manufactured through a high-temperature firing process. Its mineral composition mainly consists of cristobalite and tridymite. Silica brick has a high refractory temperature and strong resistance to acidic slag erosion but has weak resistance to alkaline slag.
Characters of Silica Bricks:
•🔥High Refractoriness:Silica bricks have a refractoriness of up to 1710-1730℃, making them suitable for high-temperature environments such as steelmaking furnaces and glass melting kilns.
•🌡️High-Temperature Volume Stability:At high temperatures, silicon dioxide transforms into cristobalite and tridymite, resulting in minimal volume change. This ensures long-term stability and resistance to deformation under prolonged high-temperature use.
•🛡️Resistance to Acidic Slag Erosion:Silica bricks exhibit strong resistance to acidic slags (such as those with high SiO₂ content) but have poor corrosion resistance to alkaline slags (CaO, MgO, etc.).
•⚠️Low-Temperature Brittleness:Below 600℃, phase transformation (quartz → tridymite) may cause volume expansion, requiring careful temperature control during heating.
Typical Applications of Silica Bricks:
•🏭Coking Furnace: Furnace walls and furnace roofs in the carbonization chamber and combustion chamber.
•🧿Glass Melting Furnace: High-temperature areas such as the furnace roof and breast wall.
•🏗️Hot Blast Stove: High-temperature sections such as checker bricks and arch roofs.
•🧱Ceramic Kiln: High-temperature firing zone structures.
•♻️Electric Steel Furnace: Furnace roof and some parts of the furnace walls.
| Item | GZ-93 | GZ-94 | GZ-95 | GZ-96 |
|
SiO₂(%)≥ |
93 | 94 | 95 | 96 |
|
Fe₂O₃(%)≤ |
1.6 | 1.4 | 1.2 | 1.0 |
|
Refractoriness（℃）≥ |
1690 | 1710 | 1710 | 1710 |
|
Apparent Porosity(%)≤ |
25 | 23 | 22 | 22 |
|
Cold Crushing Strength (MPa)≥ |
19.6 | 24.5 | 29.4 | 29.4 |
|
0.2MPa Refractoriness Under Load（℃）≥ |
1620 | 1640 | 1650 | 1660 |
|
True density(g/cm³)≤ |
2.39 | 2.39 | 2.39 | 2.39 |
| Item |
Furnace Bottom |
Furnace Wall |
Other |
|
SiO₂(%)≥ |
94.5 | 94.5 | 94 |
|
Apparent Porosity(%)≤ |
22 | 22 | 24 |
|
Cold Crushing Strength (MPa)≥ |
40 | 35 | 28 |
|
0.2MPa Refractoriness Under Load（℃）≥ |
1650 | 1650 | 1650 |
|
Permanent Linear Change After Heating(1450℃*2h)/% |
0~0.2 |
0~0.2 |
0~0.2 |
|
True density(g/cm³)≤ |
2.33 | 2.33 | 2.34 |
|
Thermal Expansion(1000℃）/%≤ |
1.28 | 1.28 | 1.30 |
3.Silicon bricks for hot blast stove
|
Item |
Dome Wall Brick |
Checker Brick |
|
SiO₂(%)≥ |
95 | 95 |
|
Apparent Porosity(%)≤ |
22(24) | 24 |
|
Cold Crushing Strength (MPa)≥ |
40(30) | 30 |
|
0.2MPa Refractoriness Under Load（℃）≥ |
1650 | 1650 |
|
True density(g/cm³)≤ |
2.33 | 2.34 |
|
Thermal Expansion(1000℃）/%≤ |
1.26 | 1.26 |
|
0.2MPa/1550℃ Creep Rate(0 h⁓50 h)≤ |
0.8 | 0.8 |
FAQ:
Q:What is the maximum service temperature of silica bricks?
A:Silica bricks can withstand continuous working temperatures of up to 1650–1700°C, making them ideal for high-temperature furnaces such as coke ovens and glass melting chambers.
Q:What is the typical SiO₂ content in your silica bricks?
A:Our standard silica bricks contain ≥94% SiO₂, ensuring excellent thermal stability and corrosion resistance in acidic environments.
Q:Are silica bricks suitable for glass furnace crown lining?
A:Yes, due to their high refractoriness, low thermal expansion, and excellent acid resistance, silica bricks are widely used in the crown of glass furnaces.
Q:Can I get customized sizes or special shapes?
A:Absolutely. We offer OEM/ODM customization, including skew bricks, checker bricks, arch bricks, and more. Just send us your drawings or specifications.
Q:How are silica bricks packaged for export?
A:Silica bricks are packed in fumigated wooden pallets or boxes, with plastic film wrapping for moisture protection, ensuring safe international shipping.
Q:What industries use silica bricks?
A:Silica bricks are widely used in:
•Coke ovens (walls and roofs)
•Glass furnaces (crown and breast walls)
•Hot blast stoves (checker chambers)
•Acidic industrial furnaces
Q:Are your silica bricks compliant with international standards?
A:Yes, our silica bricks are manufactured according to ISO 9001 and ASTM C155 standards, with consistent quality control and third-party testing available upon request.
Q:Do you offer technical support or installation guidance?
A:Yes, we provide technical consultation, refractory design assistance, and installation guidance to ensure optimal performance for your project.
