The PEI rating process tests the surface wear layer of a tile’s enamel glazing.
How PEI TIle Rating Helps
Ceramic and porcelain tilesare produced in different types for different uses.
PEI tile rating provides a shortcut to understanding if a certain tile will work in an program.
The Spruce / Margot Cavin
Always defer to the manufacturer’s instructions for proper tile installation.
It is measured by the use of a machine known as a rotary abrasion resistance testing machine.
The ratings are issued based on the number of revolutions required before visible abrasions appear on the tile.
The Spruce / Margot Cavin
PEI NR means that the tile is not rated.
Usually, these are natural stone tiles.
Stone tiles are never glazed, so they cannot be tested.
As such, this tile can be thinner and smoother, since safety is not a concern.
Wall tile can also have complicated designs, such as reliefs, that don’t work well on floors.
Some companies omit PEI ratings entirely, giving only location/room recommendations.
