Porcelain tile has as a principal characteristic its very low apparent porosity (water absorption below 0,5%), which has led to the creation of a new product group (Bla) in standard ISO 13006. Among the different types of products included in the generic name porcelain tile, glazed porcelain tile has witnessed the greatest production growth in recent years [1-2]. This is due to its excellent technical properties, as well as to its relative ease of manufacture in conventional facilities intended for the fabrication of other glazed tiles (stoneware and earthenware tiles), compared with the greater investments required for unglazed porcelain tile manufacture, in which tile decoration takes place mainly in the pressing stage and, in addition, an important part of tile production is polished.
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