The porosity of a ceramic tile or a porcelain tile is the water absorption of the material. When choosing a tile, pay attention to the ratings that measure the percentage
of water absorbed (porosity). The classifications for the porosity of tile are: impervious (least absorbent), vitreous, semi-vitreous and non-vitreous (most absorbent).
Porous tile should not be used outdoors where cold weather produces freeze/thaw cycles.
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