SK 36 Fire bricks are special type of brick which are form of Refractory ceramic material. It is used for inner surface lining of Boiler, furnace, kiln, fireplaces & fireboxes. Quality of Bricks: We offer various quality bricks are 50 to 55% Alumina offering high temperature resistance. Standard Sizes (MM): 230 x 115 x 75 MM 230 x 115 x 65 MM