| R&H Filter Co. Inc. offers six porosities of fritted ware so that precipitates varying in size can be filtered at maximum speed with no sacrifice of retention.
Porosity is controlled in manufacture, and discs are individually tested and graded into these classifications. The extra-coarse and coarse porosities are held toward the maximum pore diameter as listed. The medium, fine, very fine and ultra-fine porosities are held toward the minimum pore diameter as listed.
The porosity for the pore diameter of the filter is determined in the same manner as specified in A.S.T.M. E 128 "Maximum Pore Diameter and Permeability of Rigid Porous Filters for Laboratory Use." |
