NF A91-319-1*NF EN ISO 8289-1:2020 Vitreous and porcelain enamels - Low-voltage test for detecting and locating defects - Part 1 : swab test for non-profiled surfaces surfaces
2020NF A91-319-1*NF EN ISO 8289-1:2020 Vitreous and porcelain enamels - Low-voltage test for detecting and locating defects - Part 1 : swab test for non-profiled surfaces surfaces