Rongsheng Refractories Group
Semi-silicate brick is an aluminosilicate refractory product containing alumina (Al2O3) 15-30% and is a semi-acid refractory brick. Fire clay is usually used as the raw material for semi-silica bricks., containing quartz sand, pyrophyllite, refractory clay or kaolin enrichment waste. Semi-silica brick shrinks less during firing, since at 1250°C the quartz of the raw material turns into cristobalite, and the volume expands, which partially compensates for shrinkage, occurring during clay sintering. The manufacturing process of semi-silica brick can be divided into two types: fired and unfired. The production process of fired bricks is basically the same, like clay brick; Unfired brick is mainly made of liquid glass as a binder.
Details of semi-silicate bricks
| Subject | Index |
| SiO2 % | ≥98 |
| Al2O3 % | ≤0.3 |
| Fe2O3 % | ≤0.5 |
| CaO % | ≤0.2 |
| Bulk density g/cm3 | ≥1.8 |
| Apparent porosity % | ≤20 |
| Cold crush strength MPa | ≥30 |
| 0.2Mpa Fire resistance under load ℃ | ≥1650 |
| Thermal expansion coefficient % 1000℃ | ≤0.2 |
| Thermal shock resistance cycle water cooling at 1100℃ | ≥30 |
Representation of Rongsheng
Rongsheng is a professional supplier of refractory materials with 15-year export experience in more than 80 countries. The main products of Rongsheng include various refractory bricks, Unformed refractory materials, metallurgical materials, thermal insulation materials and so on.
