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Product introduction of lightweight silica insulation brick
Lightweight silica bricks are made of quartzite material with about 91% SiO2 content, which has good resistance to acid slag and low thermal conductivity.SiO2 has different types of crystals at different temperatures, and the transition between crystals will lead to changes in structure and density. Therefore, the changes of SiO2 crystals are closely related to the performance and use of silica bricks.
Features of lightweight silica insulation brick
Finely crushed silica is used as raw material, and its critical particle size usually does not exceed 1mm, while no less than 90% of the particles smaller than 0.5mm are used. It is made by adding flammable substances to the ingredients or using gas generation method to form porous structure, and is fired. It can also be made into non-fired products.
Cannot be in contact with alkaline refractory materials. Depending on the material, its maximum use temperature is 1200~1550℃.
Parameters of silica insulation brick
| Item | QG-1.0 | QG-1.1 | QG-1.2 |
| SiO2 % | 91 | 91 | 91 |
| Refractoriness°C | 1680 | 1680 | 1670 |
| 0.2Mpa Refractoriness Under Load °C | 1480 | 1560 | 1560 |
| Cold Crushing Strength Mpa | 3.5 | 3.5 | 3.5 |
| True Density g/cm3 | 2.39 | 2.39 | 2.39 |
| Bulk Density g/cm3 | 1 | 1.1 | 1.2 |
| Permanent Linear Change On Reheating(%) | 0~+0.5 1450°CX2h | 0~+0.5 1550°CX2h | 0~+0.5 1550°CX2h |
| Thermal Conductivity (W/MK) 350°C | 0.55 | 0.6 | 0.65 |
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