$W_a$	Water absorption [%]
$m_s$	Mass of the sample saturated with water [g]
$m_d$	Mass of sample [g]
$P$	Open porosity [%]
$m_h$	Mass of the sample saturated with water in hydrostatic conditions [g]
$\sigma$	Flexural strength [MPa]
$F_F$	Maximum load force during flexural strength test [N]
$S$	Span length [mm]
$b$	Sample width [mm]
$h$	Sample height [mm]
$C_s$	Compressive strength [MPa]
$F_c$	Breaking force during compression [N]
$l$	Length of the press plate, length of the research area for compression strength [mm]
$\rho$	Bulk density [g/cm3]
$v$	Sample volume [dm3]