Silica Insulation Bricks are produced with silica through adding inflammable substances such as coke, anthracite coal, sawdust, and carbonized rice husk, or foaming agents to form porous structure. Generally add 35-45% anthracite coal or 30% coke as inflammable substances. Since there are Fe2O3 and Al2O3 in the ash of coke and anthracite coal, there is no need to add iron scales. Silica Insulation Brick's main mineral composition includes 78%~86% tridymite, 13%~15% cristobalite and 4%~7% quartz. Its cold crushing strength is 2.0-5.9MPa, thermal conductivity is 0.35-0.42W/(m•K) and density is 0.9-1.1g/cm3.
Silica Insulation Bricks
|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) 350ºC||0.55||0.55||0.60||0.65||0.70|
|Permanent Linear Change On Reheating (%) 1450ºC*2h||0~+0.5||0~+0.5||0~+0.5||0~+0.5||0~+0.5|
|0.2Mpa Refractoriness Under Load T0.6ºC||≥1400||≥1420||≥1460||≥1500||≥1520|
|20~1000ºC Thermal Expansion 10.6/ºC||1.3||1.3||1.3||1.3||1.3|