The material must be absolutely inert and shall contain no harmful, radioactive raw materials or heavy metals such as cadmium orlead. Therefore, it is a product in compliance with the bioarchitectural techniques. The edges and the corners are slightly irregular.This completely vitrified material features a water absorption value of less than 0.5% and must be classified in the BIa group incompliance with the ISO 13006 standard. It must meet all the product requirements set forth in the ISO 10545 standard. Specifically,it must be resistant to frost (ISO 10545/12), thermal shock (ISO 10545/9) and aggression by acids and bases (ISO 10545/13). Itmust feature a water absorption value (ISO 10545/3) of less than 0,5%; it must achieve a resistance to bending stress (ISO 10545/4)greater or equal to 35 N/mm2. It must be resistant to food stains in accordance with CTI-81-7 (Ceramic Tile Institute, USA) and itmust feature a coefficient of resistance to slipperiness of R9 (DIN 51130), 0.67 (ASTM C 1028). In general, all the technical specificationsmust be checked according to the testing methods carried out in compliance with the ISO 9001 standards.