Refractory brick is a product of refractories in the form of bricks that are useful as a coating / protective material for fires, which are widely found in the market are alumina fire bricks or better known as alumina fire bricks. with its needs which are generally categorized based on operating temperature and abrasiveness (strength resistance to friction of a material) such as chemical corrosion or on the flow rate of a hot liquid. For operating temperature usually use a parameter called SK (fresh cone) or definitively is average melting point of a fire brick (not operating temperature). Usage&Nbsp; rather than fire brick &Nbsp;Depending on the planning of a kitchen to be installed, for example: thickness, height, and required conductivity. The installation method is to use fire-resistant cement or better known as "Mortar". The use of mortar will be discussed further in the Mortar discussion area. Guide&Nbsp; in determining the quality of a brick by naked eye, does not lie in the stamp and its performance (appearance)&Nbsp; however, it comes from its alumina content (this is difficult to prove, because not all factories have testing equipment) weight of goods &(corresponding to Specific Gravity) and sizing precision, melodic resilience (corresponding to strength). Smooth surface is not a guarantee of good quality, because it is just a trick of the market to improve the performance of goods. The smoother the surface area, the lighter the material will be abraded.