Home Refractory Knowledge Apparent Porosity (ASTM C830)

Apparent Porosity (ASTM C830)

Apparent Porosity (ASTM C830)

The apparent porosity, sometimes referred to as open porosity, is a measure of the open or interconnected pores in a refractory. The porosity of a refractory has an effect upon its ability to resist penetration by metals, slags and fluxes and, in general, the higher the porosity, the greater the insulating effect of the refractory. In contrast to apparent porosity, true porosity represents a sample’s total porosity, both open and closed pores. Closed porosity refers to porosity within the coarser grains, which cannot be readily determined. Hence, true porosity may be difficult to measure.

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Last updated: 2024-01-03
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