Silica brick
The refractoriness under load (RUL) reaches 1640–1670°C. It maintains volumetric stability during prolonged exposure to high temperatures.
Application
designed for coke ovens, blast furnace hot blast stoves, glass melting furnaces, electric arc furnaces (EAF), open-hearth furnaces, reheating furnaces, and other thermal industrial equipment.
Description
Silica brick is an acidic refractory material fired from quartzite, with a SiO₂ content of no less than 93%. It is classified as a siliceous product with a true density of 2.35 g/cm³. Its mineralogical composition consists predominantly of tridymite and cristobalite, with minor amounts of residual quartz and glass phase. It exhibits resistance to acidic slags but is highly susceptible to basic slag corrosion. Its refractoriness under load (RUL) reaches 1640–1670°C. During prolonged service at high temperatures, it maintains volumetric stability. But demonstrates poor thermal stability at low temperatures: below 800°C, slow heating rates are mandatory. When heated to 1450°C, it undergoes permanent expansion of 1.5–2.2% to ensure masonry tightness. True density is a critical quality parameter: premium-grade products require ≤2.35, while standard-grade permits ≤2.38.
Specifications
| Item | BG-96A | BG-96B | BG-95 | JG-94 | GZ-94 |
|---|---|---|---|---|---|
| SiO2 % ≥ | 96 | 96 | 95 | 94.5 | 94 |
| Fe2O3 % ≤ | 0,6 | 0,8 | 1,0 | 1,2 | 1,4 |
| MFR % ≤ | 0.5 | 0.7 | – | – | – |
| Apparent Porosity % ≤ | 21 | 22 | 22 | 22 | 24 |
| True Density г/см3 ≥ | 2,34 | 2,34 | 2,34 | 2,33 | 2,35 |
| Cold Crushing Strength MPa ≥ | 40 | 35 | 30 | 40 | 30 |
| RUL 0.2 MPa °C ≥ | 1680 | 1670 | 1670 | 1650 | 1650 |
| PLC at 1450°C×2h % | 0~0,2 | 0~0,2 | 0~0,2 | 0~0,2 | – |
| Residual Quartz Content % ≤ | 3 | 3 | 3 | 1,5 | – |
Features
High Deformation Temperature
Over 1640°C, maintains volumetric stability under prolonged high-temperature serviceHigh Cold Crushing & Flexural Strength
Withstands significant mechanical loads and impact forces, ensuring structural safetyExcellent Thermal Shock Resistance
Preserves structural integrity under rapid thermal cycling without cracking/spallingApplications
- Coke Ovens: Regenerator walls, Sloped flues, Combustion chambers, Coking chambers, Oven roofs
- Blast Furnace Hot Blast Stoves: Checker brick walls, Checkerwork, Regenerator dome
- Glass Melting Furnaces: Upper structure components: Crown arches, Breast walls, Suspended walls, Burner ports, Regenerator arches
- Electric Arc Furnaces (EAF) & Converters: Lining refractories, Tap holes
- Open-Hearth Furnaces: Regenerators, Slag pockets
- Reheating Furnaces & Other Thermal Units: Roof arches, Sidewalls
Crown arch of glass melting furnaces
Suspended bricks and cooling basin wall bricks
Calcinator
