Porcelain and non-porcelain tile might look the same, but their durability differs
All tiles made of clay and cured by heat are ceramic tiles. However, ceramic tile is best understood by dividing it into two product classifications: porcelain and non-porcelain. Their availability and look are roughly the same, but their durability is not.
Porcelain tile is more durable and is the top choice when strength matters most. Although nonporcelain tiles can be quite durable, none are as resilient as porcelain. Porcelain tiles are created by mixing porcelain clay and very finely ground sand, and curing them with high heat and pressure. Porcelain tile is denser and harder than nonporcelain tile and has a lower water-absorption rate of 0.5% or less. Porcelain’s density makes it highly resistant to physical damage, while its low absorption rate makes the tile frost resistant, allowing it to be used outdoors. Unglazed porcelain tile is sought after for its full-body characteristics, which means its color remains consistent throughout the tile. Surface scratches are less noticeable as a result, a benefit that diminishes when the tiles are glazed.