An important consideration when choosing your tile is the tiles hardness which inevitably determines its durability and application. The hardness of a tile is rated using a PEI scale which ranges from 1-5. A PEI rating does not determine the quality of a tile, just the hardness. A PEI rating of 1 is still hard to the touch, it is just not as dense as a PEI of 5.
PEI 1 :
suitable for wall applications only. Fragile but beautiful tile.
PEI 2 :
suitable for very light foot traffic. Not suitable for kitchens, walkways and entryways.
PEI 3 :
suitable for residential and light commercial use such as offices, reception areas, interior walls and hallways.
PEI 4 :
suitable for regular traffic very durable tile. Applicable to outdoor and indoor use, such as schools, homes, businesses etc.
PEI 5 :
suitable for industrial use with very heavy traffic. Most durable tile.