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Expanded metal is made from a metal sheet by a repetitive process that involves first cutting it to form a series of short slits, and then stretching the sheet to open up these slits into the characteristic diamond apertures (Figure 2.17). This may be
followed by calendering (pressing between rolls) so as to flatten the resultant metal strands from the sloping profile imposed on them during stretching. This format is widely used for structural material, and its main use in filtration is as cylindrical
cores upon which other media are laid or moulded, or as supports for flat pads of fibrous media.

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