A very hard full bodied man made tile that is available in a variety of colours and is mechanically polished to create a highly polished surface. The polishing process in most cases opens up micro-pores on the surface making the tile susceptible to staining. It is advisable to establish the general absorbency before sealing. This will normally vary according to the origin of the tile and where it has been manufactured. Porosity Test: Up to 2 hours.