Table 3.

Density and porosity of the tested materials.

Material	Density, g/cm3	Porosity, %
Xn–Alg–Hep	0.021	71.26
Xn–PU–Hep	0.022	83.11
XnOA–Alg–Hep	0.024	44.43
XnOA–PU–Hep	0.030	60.0