The amount of water absorption that a particular kind of ceramic tile is expected to continuously absorb is measured by its water absorption rate. If the amount of water penetration is too great, some kinds of tiles may break. For tile water moisture absorption, there are four distinct ratings: Tile that is non-vitreous (low density) that absorbs more than 7.0 percent of the water. Tile with water absorption of more than 3.0 percent but less than 7.0 percent is classified as semi-vitreous (medium density).  Water absorption in vitreous (high density) tiles is more than 0.5 percent but not greater than 3.0 percent. Tile with a 0.5 percent or lower water absorption rate is considered impervious (very thick). Here is how porcelain tile is often classified. Apart from their resistance to wear and tear, ceramic tiles are categorized according to the water absorption rate, which reflects the density of the tile body. The applicability of the different kinds of tile for indoor or outdoor uses is closely correlated with the water absorption rate. The chosen tiles for external applications must have an extremely low water absorption rate (as near to an impermeable rating as feasible), particularly in areas with frequent. A tile with a poor water absorption rate might also absorb stains from food or beverages less thoroughly. The typical tile used for this has a moisture absorption value of less than 0.5 percent and is porcelain. The most crucial tile measurement is water absorption rates. The amount of moisture that a particular kind of tile is expected to continuously absorb is measured by its water absorption. If the moisture penetration is too great, several kinds of tile may break. The quantity of water that may fail due to cyclical salt assault and freeze-thaw is limited by low water absorption.