All glazed tiles, whether porcelain or ceramic, have a PEI rating which will tell you how resistant the glazed surface is to scratching and chipping. A tile with a PEI of 1 will scratch and chip easily and should only be used on walls. A PEI of 2 is good for light residential areas like bathrooms. A PEI of 3 is good for all residential applications. 4 is used in commercial applications and 5 for heavy commercial applications like a mall.

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