scope:

This European Standard defines methods for determining the dimensional characteristics (length, width, thickness, straightness of sides, rectangularity, surface flatness) and the surface quality of all ceramic tiles. Tiles with areas less than 4cm² are excluded from measurements of length, width, straightness of sides, rectangularly and surface flatness. Spacer lugs and glaze blobs and other irregularities of the sides shall be ignored when measuring length, width, straightness of sides and rectangularity if these are subsequently hidden in the joints after fixing.