Ceramic vs Porcelain tile - its all down to density
You may have seen different types of tile at your supplier and wondered what the benefits and drawbacks might be. Most ceramic tiles are classified as Non-Vitreous, Semi Vitreous or Vitreous. These names refer to their ability to soak up water. Most wall tiles are classified as Non-Vitreous as they have a low density and they are only suitable for indoor use, Semi- Vitreous and Vitreous are stronger tiles and are used for indoor floors and some outdoor applications and some are described as Frost Proof.
Impervious tiles are generally made from porcelain which is a type of ceramic tile manufactured from a special mixture of clays and fired at very high temperatures. This makes an extremely dense and strong tile that is exceptionally hard and resistant to water and staining. Porcelain tile is tougher than granite and can be used in all outdoor applications as well as indoor applications.