white clay used for the manufacturing of porcelain.

small size tiles with high thickness whose mix is made of ordinary clays and kaolin, feldspar and non-plastic materials. It differs from porcelain stoneware as it has a heterogeneous body and is less vitrified but, just like porcelain stoneware, it is resistant to frost and to chemicals and has a high mechanical bending strength. Klinker products are obtained via pressing or extrusion and fired at more than 1200°C with long firing cycles. Klinker tiles are used for indoor and outdoor flooring. The main producer of this product is Germany, the country where it was invented in 1930.