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artin ed f e 3 In replication processing of open-pore aluminium foams, the relative density can be varied by densifying the NaCl preform before The properties of foamed and highly porous metals are from a variety of other materials (see e.g. Refs. [6,7]), and to offer good control over the cell size [8–10] and cell shape [10,11]. The foam relative density can also be varied [9,12]; turn, can be achieved either by cold isostatic pressing 2. Experimental NaCl preforms were made using either sintering or cold isostatic pressing. Two NaCl particle types were used: (i) particles of mean diameter 400 lm (>99.5 % pure, supplie