Tiles are popularly used in construction and are made of several materials like stone, glass, ceramic and porcelain. Each differs in density and even within each the hardness can be controlled. When choosing tiles for any purpose, density plays the most important role as it determines whether the surface is easily scratched or immune to abrasions.

The factor that decides if a tile is dense is moisture absorption. Tiles with a low moisture absorption rate are very hard and, thus, well protected against not only the damaging effects of water but scratches as well.

Impervious tiles

Impervious tiles are those that have less than one percent moisture absorption. They’re perfect for regions that see a lot of snow and rain and while meant for outdoor use they can also be used in interiors.

Vitreous tiles

Vitreous tiles have less than three percent of moisture absorption. They are guarded against the effects of rain and snow but aren’t advised for use in the outdoors. This is because they can crack under extreme cold.

Semi-vitreous and non-vitreous tiles

Tiles having moisture absorption rate of between three and seven percent are called semi-vitreous tiles while those that absorb over seven percent of moisture are referred to as non-vitreous. They’re designed for use in the indoors only.