Stability to chemical influences.

Stability to chemical influences.

This indicator determines which room can be finished with a particular tile. Marking «AA» means that ceramics are not amenable to chemical influences, which means it is useful for the bathroom or kitchen. One letter “A” speaks of small effects on the appearance of ceramic tiles, “B” — medium, and the letter “C” is marked with tiles, which, when exposed to chemicals, will absolutely lose its appearance.