What is PEI Rating (how is durability measured)?
Among the manufacturers of ceramic tile there are certain standards that are universal. ISO Standards have been established by the International Standards Organization to unify product standards and testing methods for ceramic tiles worldwide. One of the most important of these standards is the PEI rating. The P.E.I. (Porcelain Enamel Institute) rating is a measurement of how well a ceramic tile will wear. Generally, ceramic tile manufacturers classify their products in 5 categories.
