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Lightweight silica bricks are also called silica insulation bricks. It is a lightweight refractory material with a silica content of more than 91% and a volume density of less than 1.2g/cm3. The refractoriness and load softening temperature are not much different from ordinary silica bricks with the same composition. However, due to the large number of pores, the compressive strength, slag resistance, corrosion resistance, etc. are not as good as ordinary silica bricks, but the thermal shock resistance has been improved.

lightweight silica bricks
lightweight silica bricks

Lightweight silica insulation bricks’ physical and chemical indicators

Silica Insulation Bricks
SiO2 %≥88≥91≥91≥91≥91
Bulk Density g/cm3≤0.85≤1.00≤1.10≤1.15≤1.20
Cold Crushing Strength  Mpa≥1.0≥2.0≥3.0≥5.0≥5.0
Thermal Conductivity (W/MK) 350℃0.550.550.600.650.70
Permanent Linear Change On Reheating (%)  1450℃*2h0~+0.50~+0.50~+0.50~+0.50~+0.5
0.2Mpa Refractoriness Under Load T0.6℃≥1400≥1420≥1460≥1500≥1520
20~1000℃ Thermal Expansion 10.6/℃

Application of lightweight silica bricks

silicon insulation bricks
silicon insulation bricks

Lightweight silica brick is a very special material, mainly used in the glass industry and steel industry. In most cases, lightweight silica bricks and dense silica bricks are used as structural layer parts. It is commonly used in the glass kiln industry, mainly for thermal insulation of the kiln vault, thereby reducing heat loss and increasing the efficiency of the melting process. In the steelmaking industry, lightweight silica bricks are used for lightweight walls and domes of hot blast furnaces.

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