Porcelain or ceramics. Tiles are commonly used to cover floors and walls, with a water absorption rate of less than 0.5 percent. The clay used to build porcelain tiles is generally denser. They can either be glazed or unglazed. Related to its resistance is its durability, substantially reducing its maintenance costs; porcelain stoneware, additionally, is characterized by its very low porosity, which is almost nil. Therefore, it is impermeable to water, acids and dirt, making it suitable for busy areas as it is easy to clean. Eastlancstilecentre.co.uk.