Also known as the open porosity. The percentage of open pores in the refractory product as a percentage of the total volume of the article. Except as indicated, the porosity of the Chinese refractory industry generally refers to the apparent porosity. The apparent porosity is an important indicator for evaluating the quality of refractory raw materials or products. It not only reflects the compactness of refractories, but also indicates whether the manufacturing process is reasonable. In addition to lightweight refractory products, low porosity raw materials or articles are beneficial for improving product quality, increasing mechanical strength of the article, reducing surface area in contact with the slag, and extending service life.
Appearance porosity formula:
Apparent porosity = ( s - w / s - i ) * 100
s - weight of piece soaked
w - weight of dry piece
i - weight of the piece soaked and immersed.
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