How Tile is Rated for Water Absorption

Water absorption is tested by boiling the tile in water and then measuring how much weight it gained from when it was dry. There are four different ratings.

Non-vitreous is low density. Tile with water absorption of more than 7.0 percent.

Semi-vitreous is medium density. Tile with water absorption of more than 3.0 percent but not more than 7.0 percent.

Vitreous is high density. Tile with water absorption of more than .50 percent but not more than 3.0 percent.

Impervious is extremely dense. Tile with water absorption of 0.5 percent or less.

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