In 2014 certificate according to standard IRIS (International Railways Industry Standard) was received. This certification also done by BUREAU VERITAS proves the highest possible quality of supplies for railways industry. In 2020 recertification was carried out by Lloyd body.
By acquisition of the ISO 9001 and IRIS certificates as well as ISO 14001 (environmental management) and ISO 45001 (occupational health and safety management), a new stage of continuous quality improvement and process effectiveness has been commenced.. The act of certification itself is seen in ZEZ SILKO, s.r.o. as a tool for strengthening mutual trust and as the basis for the functioning and effective quality management system