Unglazed fast fired porcelainized stoneware tiles, for pavering and for exteriors, are the main innovative products present on the tile market. They are prepared using mainly kaolinitic clays, quartz and large amounts of fluxes to increase the sintering. The raw materials are more highly milled than those used for other kinds of tiles and the bodies are fired at 1200-1220°C. Tiles are not glazed and may be coloured. Its structure consists of a glassy matrix with mullite and residual quartz. The basic product presents high mechanical and technical qualities and peculiar abrasion resistance and surface hardness.