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Powdered metal cannot be readily ground or machined. It is made in discs, sheets, cones or special shapes for filtering fuel oil, refrigerants, solvents, etc. The smooth surface associated with a perforated plate permits brush cleaning or scrubbing in addition to the naturally easier discharge from such surfaces. The hard metallic material has a long life, not being subject to abrasion or flexing. The size of particles filtered on such plates must be relatively large. Normally, plates are confined to free-filtering materials where there is little danger of clogging. Metallic filter media may be used either for cake filtration or depth filtration, i.e., pore clogging. Regeneration of media may be achieved by dissolving solid particles inside the pores or by back thrust of filtrate.

Table 5. Comparative particle sizes.

U.S. Mesh

in.

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