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The porosity of kiln fire bricks

Aug. 19, 2016

Kiln fire bricks porosity is the percentage of pore volume and refractory products' total volume. Kiln fire bricks' pores are divided into two categories: closed in the refractory bricks and not communicated with outside is called closed pores; communicated with outside world and can provide fluid-filled pores called opening pores. In opening pores, pass products' two sides and fluid can go through is called penetrate pores.

The vast majority of Kiln fire bricks pores are open pores, refractory brick porosity can be as small or large from near 0% to 80%. Apparent porosity dense products in general 10% to 28%. The products less than 15% is called low porosity products. CCEWOOL Kiln fire bricks porosity generally control within 22-26%. Porosity is basic technical data in most refractory material. It affects almost all properties of refractory products, in particular the compressive strength, thermal conductivity, slag resistance and thermal shock resistance. Porosity increases, strength decreases, which is not only due to the solid cross-sectional area decreases causing actual stress increases. More important is porosity becoming material’s defects can cause stress concentration and decrease. Effect of coarse pores is more significant. Reduce Kiln fire bricks porosity is beneficial to improve refractory material’s refractoriness under load and high temperature creep resistance.

CCEWOOL Kiln fire bricks factory with more than 40 years production experience. Mix material machine and compress machine all in automatic operation, which controls stable quality in semi-finished product. Product advantages below:

1. Precise size, tolerance would be controlled within +1mm, which is easy for install.

2. Compared with same degree fire brick, its porosity is lower and the compressive strength is 20% higher.

3. Uniform color, fewer black spot, low Fe content, 20% longer service life.

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