Mosaic tiles add a touch of elegance to kitchens, but in high-traffic areas, durability matches style in importance. PEI ratings guide the selection of mosaic kitchen tiles for backsplashes or kitchen floor tiles for heavy use. Here’s the essential breakdown. What Is a PEI Rating? The Porcelain Enamel Institute (PEI) assesses glazed tiles’ wear resistance on a scale from 0 to 5....