 There are also countries undertaking small-scale production, such as Australia and strong growth in Brazil.The wear rating of the tile can be graded from zero to five according to ISO 10545-7 (also, ASTM C1027) test for surface abrasion resistance of glazed tile, and this can be used to determine suitability for various end use conditions.The dense, hard surface of porcelain has made polishing a viable alternative to a glazed surface.