The material must be absolutely inert and shall contain no harmful, radioactive raw materials or heavy metals such as cadmium or lead.Therefore, it is a product in compliance with the bioarchitectural techniques. The back of the material must show the natural circularsaw cutting, the edges and the corners are straight. This completely vitrified material features a water absorption value of less than0,5% and must be classified in the BIa group in compliance with the ISO 13006 standard. It must meet all the product requirementsset forth in the ISO 10545 standard. Specifically, it must be resistant to frost (ISO 10545/12), thermal shock (ISO 10545/9) andaggression by acids and bases (ISO 10545/13). It must feature a water absorption value (ISO 10545/3) of less than 0,5%; it mustachieve a resistance to bending stress (ISO 10545/4) greater or equal to 35 N/mm2. It must be resistant to food stains in accordancewith CTI-81-7 (Ceramic Tile Institute, USA).In general, all the technical specifications must be checked according to the testing methods carried out in compliance with the ISO9001 standards.