The research by title effect of the differences hydrotermal extraction methods and calcination the characterization of silika from corn cob has been performed. Corncob is extracted by hydrothermal variation NaOH concentration methods 0.5;1.0; 1.5 and 2.0 M and calcination methods with temperature variations 600, 700 and 800oC, to obtain silica powder and on hydrothermal methods with NaOH concen…