Light Weight Silica Brick is made of quartz stone material, the content of SiO2 is approximately 91% and it has good resistance to acid slag and low heat conductivity. SiO2 has different types of crystals under different temperatures and the transforms between the crystals will cause the changes of the structure and density. So there is a close contact between the changes of SiO2 crystals with the performance and usage of silica bricks.
2.Small volume density.
3.Good insulation effect.
4.High mechanical intensity.
5.Small thermal conductivity.
It is widely used in the partition wall of carbonization chamber, firing chamber of coke oven, heat regenerator chamber of steelmaking open hearth furnace, slag pocket, soaking pit furnace, glass melting furnace, arch crown and other weight bearing area of ceramic kilns.
Physical and chemical index:
Light Weight Silica 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(%)1550°CX2h 0~+0.5 1450°CX2h 0~+0.5 0~+0.5 Thermal Conductivity (W/MK) 350°C 0.55 0.6 0.65