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What is the difference between refractory brick and lightweight brick?

What is the difference between refractory brick and lightweight brick?

The main function of lightweight bricks is to keep heat insulation, reduce heat loss, and improve thermal efficiency. It is a scientific and efficient energy-saving technical measure that can slow down the heat transfer rate.

Among the refractory materials, lightweight bricks and refractory bricks (without thermal insulation properties) are basically refractory materials that are widely used. However, there is a big difference between lightweight bricks and refractory bricks.

1, heat preservation performance

The thermal conductivity of lightweight bricks is generally 0.2~0.4 (average temperature 350±25℃) w/mk, and the thermal conductivity of refractory bricks is greater than 1.0 (average temperature 350±25℃) w/mk. Therefore, the thermal insulation of lightweight bricks Performance is better than refractory bricks.

2, fire resistance

The fire resistance limit of light bricks is generally below 1400℃, and the fire resistance limit of refractory bricks is above 1400℃.

3, density

The density of  lightweight bricks is 0.8-1.0g/cm3, while the density of refractory bricks is above 2.0g/cm3.

Generally speaking, lightweight bricks are not directly exposed to flames, high temperature melts and chemical gases. According to different materials and physical and chemical properties, refractory bricks can be used to withstand various erosions of direct flame baking and high-temperature molten materials in the furnace.

From the point of view of the scope of use, the application frequency of refractory bricks is far greater than that of lightweight bricks. However, in recent years, with the increasing awareness of environmental protection and energy saving and the use of high-temperature thermal efficiency, lightweight bricks have also been widely used in the procurement of kiln masonry. In particular, there are many new types of lightweight bricks: lightweight mullite bricks, lightweight high-alumina bricks, and light clay bricks.