The PEI method divides glazed tiles into 5 scales in order to differentiate between the abrasion resistance. The details are given below:
Group I: Tiles coming under this group are only suited for areas with light or no foot traffic. Wall tiles usually come under this group. Tiles in this are very rarely used as floor tiles.
Group II: These tiles can be used in medium level traffic areas in your home.
Group III: Tiles that come under this group can be used everywhere in your home.
Group IV: Tiles with the level of abrasion resistance can be used in homes as well as in commercial areas with light to medium traffic.
Group V: They can be used in any residential and commercial place.