2018EN ISO 4045:2018 Leather - Chemical tests - Determination of pH and difference figure
2008EN ISO 4045:2008 Leather - Chemical tests - Determination of pH (ISO 4045:2008)
1998EN ISO 4045:1998 Leather - Determination of pH ISO 4045:1977
EN ISO 4045:1998 Leather - Determination of pH ISO 4045:1977 was changed to CEN EN ISO 4045:2008 Leather - Chemical tests - Determination of pH (ISO 4045:2008).