Products
Silica Brick
• SiO₂ Content: ≥94–96%
• Apparent Porosity: ≤22–24%
• Cold Crushing Strength: ≥25–35 MPa
• Refractoriness Under Load: ≥1640–1660°C
• True Density: ≤2.34–2.35 g/cm³
• Function: Acid Slag Resistance & High-Temperature Strength & Low Creep & Volume Stability
Product Introduction
Silica Brick is an acidic refractory brick manufactured from selected silica raw materials, mineralizers and bonding materials.
During production, the raw materials are crushed, mixed, shaped, dried and fired at approximately 1400–1430°C. The main mineral phases consist of tridymite, cristobalite, a small amount of residual quartz and glass phase.
Silica Brick generally contains at least 94% SiO₂. It provides high refractoriness under load, good high-temperature mechanical strength and reliable volume stability during continuous high-temperature operation.
The brick is especially suitable for coke ovens, glass melting furnaces, hot blast stoves and other industrial furnaces operating under acidic conditions. Standard grades include GZ-94, GZ-95 and GZ-96.
Feature:
- High silica content.
- High refractoriness under load.
- Good high-temperature mechanical strength.
- Good resistance to acidic slag.
- Good resistance to acidic furnace atmospheres.
- Low creep rate at high temperatures.
- Good volume stability during continuous operation.
- Good thermal conductivity.
- Small residual expansion after firing.
- Stable structure above approximately 600°C.
- Suitable for long-term high-temperature operation.
- Standard and customized shapes available.
Silica Brick performs most reliably when maintained at high operating temperatures. Above approximately 600°C, the mineral structure is relatively stable and its resistance to temperature fluctuations improves.
Application:
Silica Brick is mainly used as a structural working lining in high-temperature industrial furnaces operating under acidic conditions.
Typical applications include:
- Coke oven carbonization chambers
- Coke oven combustion chambers
- Coke oven partition walls
- Coke oven furnace walls and roofs
- Coke oven regenerator chambers
- Glass melting furnace crowns
- Glass furnace breast walls
- Glass furnace end walls
- Glass furnace regenerators
- Hot blast stove domes
- Hot blast stove furnace walls
- Hot blast stove checker chambers
- Steel soaking furnaces
- Ceramic firing kilns
- Acidic furnace roofs
- Other high-temperature load-bearing furnace structures
Silica Brick should not normally be selected for areas exposed to strong basic slag or rapid repeated cooling below its stable high-temperature operating range. The appropriate grade should be selected according to furnace atmosphere, operating temperature, mechanical load and heating cycle.
The reference manufacturer identifies coke ovens, glass melting furnaces, hot blast stoves, soaking furnaces and ceramic kilns as the principal applications.
Technical Data:
| Item | GZ-96 | GZ-95 | GZ-94 |
| SiO2, %, ≥ | 96 | 95 | 94 |
| Fe2O3, %, ≤ | 1.0 | 1.2 | 1.4 |
| Apparent porosity, %, ≤ | 22(24) | ||
| Normal temperature compressive strength, MPa, ≥ | 35(30) | kg/pcs,＜20Kg | |
| 30(25) | kg/pcs, ≥20Kg | ||
| 0.2MPa Load softening temperature, ≥ | 1660 | 1650 | 1640(Colloidal silica1620) |
| True Density, g/cm3, ≤ | 2.34 | 2.35 |
The technical data above are typical reference values. Final specifications may vary according to raw-material purity, mineralizer content, forming pressure, firing process, brick dimensions and testing standards.
