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What is the difference between refractory bricks and insulation bricks?

What is the difference between refractory bricks and insulation bricks?

The main function of thermal insulation bricks is to keep them warm and reduce heat loss. Thermal insulation bricks generally do not directly touch the flame, while refractory bricks generally directly touch the flame. Refractory bricks are mainly used to withstand the burning of flames. Generally divided into two types, namely unshaped refractories and shaped refractories. Unshaped refractory material: also called castable, it is a mixed powdery granule composed of a variety of aggregates or aggregates and one or more binders. It must be mixed with one or more liquids and mixed evenly during use. Has strong liquidity. Shaped refractory materials: generally made refractory bricks, the shape of which has standard rules, and it can also be temporarily processed according to needs when building and cutting.


The main differences between thermal insulation bricks and refractory bricks are as follows:

1. Thermal insulation performance

The thermal conductivity of thermal insulation bricks is generally 0.2-0.4 (average temperature 350±25°C) w/mk, while the thermal conductivity of refractory bricks is above 1.0 (average temperature 350±25°C) w/mk, and the thermal insulation brick can be obtained. The thermal insulation performance of Refractory Brick is much better than that of refractory bricks.

2. Refractoriness

The refractoriness of insulation bricks is generally below 1400 degrees, while the refractoriness of refractory bricks is above 1400 degrees.

3. Density

Insulation bricks are generally light-weight insulation materials, with a density of 0.8-1.0g/cm3 and the density of refractory bricks is basically above 2.0g/cm3.

Generally speaking, refractory bricks have high mechanical strength, long service life, good chemical stability, no chemical reaction with materials and good high temperature resistance. The high heat resistance temperature can reach 1900℃. It is especially suitable for high and low temperature shift furnaces, reformers, hydroconverters, desulfurization tanks and methanizers in chemical fertilizer plants to disperse gas and liquid, and support, cover and protect catalysts. It can also be used in hot blast stoves and heating conversion equipment in the iron and steel industry.


Refractory bricks have the advantages of high density, high strength, wear resistance, good corrosion resistance, low thermal expansion coefficient, high grinding efficiency, low noise, long service life, and non-contaminating materials. It is a grinding medium suitable for various grinding machines.

Refractory bricks are very different from thermal insulation bricks, and their use environment, scope and function are different. Different materials will be used in different positions. When choosing materials, we must decide which refractory material is suitable for our own use according to our actual situation.