The most important achieved results in the research are: First Al-Safra activated clay by using sodium carbonate at ratio wt% (5%) with the additives (alumina and magnesia) underwent firing temperature at(1300 °C) without any distortion in the appearance and gave the maximum compressive strength to (60.41 MPa), which is higher than of the bentonite (as a based material, of about 8.47 MPa). Second: Qara Tappah activated bentonite by using ratios of Na2CO3 at (5% and 7.5%) showed an undergoing to the heat treatment to 1400 °C without any distortion and shrinkage in dimensions and best value of the thermal conductivity as a thermal insulator which was (0.039 W/m.K).