where qporous is the density of the porous material while qsolid is the density of solid
material (the density of the sample after milling and so causing no porosity). qbinder
is the density of the resin mixture of cement, and qbinder matrix is the density of the
resin mixture of cement with 0% porosity ratio. Z is the EPS ratio (%) and (1  Z) is
the binder ratio (%).
The results determined from Eq. (5) and presented in Table 5. Drilling, grooving
and coloring test has been applied to specimens in usability testing.