Ceramic fibers are small-dimension filament or thread composed of a ceramic material, usually alumina and silica, used in light weight units for electrical,thermal,and sound insulation. Ceramic fiber is crystalline or amorphous synthetic minerals, which are characterized by their refractory nature, they are obtained mainly in the form of whiskers.They are normally composed of silica and alumina oxides. Most ceramic fibers are poly crystalline or poly crystalline oxides and are generally white in color. These fibers are used where high temperature resistance is required.