This scattering may be explained from the different clay com-position and the manufacturing samples procedures.
Mainly FCBs’s properties depend on firing temperature, mineral composition [56]and forming pressure.
Since firing temperature is the same in both researches, it is suggested, differences between previous research and this paper may be based on the content of SiO2 and Al2O3 and on the shaping pressure.
On one hand higher percentage of SiO2 implies lower LS and a decreasing of WL, BD, CS and an increasing of AP. On the other hand Ref.