This part of ISO 10545 specifies methods for determinating the demensional characteristics (length, width, thickness, straightness of sides, rectangularity, surface flatness) and the surface quality of ceramic tiles.

Tiles with areas less than 4 cm2 are excluded from measurements fo length, width, straightness of sides, rectangularity and surface flatness.

Spacer lugs and glaze blogs and other irregularities of the sides shall be ignored when measuring length, width, straightness of sides, rectangularity, if these are subsequently hidden in the joints after fixing (installation).