Brief Introduction
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.
Silicon insulation brick is a kind of high temperature insulation material, with high purity, high strength, high softness, low porosity, low impurity content and so on. Resistant to acid gas erosion, high temperature volume stability, the maximum use temperature of 1420 (°C). In the industrial furnace, it plays a role in thermal insulation, lowering energy consumption, and improving thermal efficiency. It can also effectively protect the inner main body from refractories and prolong the service life of the furnace. 
Technical Datas
| Item | RW-0.8 | RW-1.0 | RW-1.1 | RW-1.15 | RW-1.2 |
| 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 |
| 0.2Mpa Refractoriness Under Load T0.6 ℃ | ≥1400 | ≥1420 | ≥1460 | ≥1500 | ≥1520 |
| Permanent Linear Change On Reheating（%）1450℃X2h | 0～+0.5 | 0～+0.5 | 0～+0.5 | 0～+0.5 | 0～+0.5 |
| 20－1000℃ Thermal Expansion 10-6/℃ | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
| Thermal Conductivity (W/MK) 350℃ | 0.55 | 0.55 | 0.6 | 0.65 | 0.7 |
Features
1.Low bulk density.
2.Low thermal conductivity.
3.High apparent porosity.
4.Good thermal shock resistance.
5.Great high temperature mechanical strength.
6.High temperature stable volume change.
7.Strong acid slag erosion resistance.
Application
1.Silica Insulation Bricks are widely used for thermal insulation layer of various high temperature kiln equipments.
2.Silica Insulation Bricks can be used in Glass Plant furnaces, iron & steel industry, ceramic furnace and other furnace for providing perfect insulation from heat.
3.Silica Insulation Bricks is widely used in Coke ovens, Hot blast stove, Glass furnace, Carbon forging furnace and other industrial furnace.