Porosity concept

Porosity concept

Porosity is the percentage of the total volume of the cavities in the filter plate product to the total volume of the filter plate product. The porosity determines the filtration capacity of the foam ceramic filter plate per unit volume. The larger the porosity, the larger the filtration flow rate of the filter plate and the stronger the filtration capacity, and vice versa.   

There are currently two main methods for determining porosity.   

One is to calculate the volume of the hole in the filter plate according to Archimedes' law, that is, to inject water into the glass beaker with the overflow pipe until the water flows out from the overflow pipe, and the water will be tested when the water is no longer flowing out. All the samples are gently placed in the water, then the water flows out of the overflow tube, and the volume of water in this part is measured. The volume of the overflow water is subtracted from the physical volume of the filter plate, which is the total volume of the holes in the filter plate. volume. Welcome to the company's official website http://   

Another method is to first determine the true density of the sample to be tested. And bulk density And then calculate the porosity of the sample according to the formula below .   

These two methods have their own advantages and disadvantages. The method of operation is simple and convenient, and the detection speed is fast, but its fatal weakness is due to the water absorption characteristics of the filter plate material itself, so that the volume of water discharged is smaller than the actual one. This causes the measured data to be too small. Although the test process of the second method is more complicated, the influence of the water absorption of the filter plate material is excluded during the test, and the obtained data is relatively accurate.   

The index of porosity is determined to be greater than 84% in this standard .





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● Main index

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