The material must be absolutely inert and shall contain no harmful, radioactive raw materials or heavy metals such as cadmium or lead. Therefore, itis a product in compliance with the bioarchitectural techniques. Edges and corners are irregular, whereas the soft surface must reproduce the typicaltexture and variegation of the natural stone.This completely vitrified material must be classified in the BIa group in compliance with standard ISO 13006 and meet all the product requirementsset forth in standard ISO 10545. Specifically, it must be resistant to frost (ISO 10545/12), thermal shock (ISO 10545/9), and the effects of acids andbases (ISO 10545/13). It must feature a water absorption value (ISO 10545/3) of less than 0,5% and achieve a resistance to bending stress (ISO10545/4) greater than or equal to 35 N/mm2 It must be resistant to food stains in accordance with 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 ISO 9001 standards.