Table 2.

Shrinkage and porosity of the RP/FP aluminium foams with a PU template cell size of 10 ppi, 20 ppi and 30 ppi.

Sample	Volumetric Shrinkage, %	Total Porosity a, %	Cell Porosity b, %	Strut Porosity c, %
10 ppi	57.6 ± 2.8	86.9 ± 0.9	76.8 ± 2.1	47.3 ± 2.7
20 ppi	56.1 ± 3.7	86.6 ± 1.1	73.5 ± 2.5	53.8 ± 3.4
30 ppi	56.4 ± 1.4	86.5 ± 0.6	68.6 ± 4.1	59.8 ± 4.5

^a (V_{material pores} + V_{hollow strut pores} + V_{cell pores})/V_foam; ^b (V_{cell pores} + V_{hollow strut pores})/V_foam; ^c (V_{material pores} + V_{hollow strut pores})/(V_{hollow strut pores} + V_material + V_{material pores}).