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If the hazard classification is affected (section 2), a new version is generated with a new issue date of issue, revision date and supersedes date.
In cases of safety data sheet modifications which Changes made to SDSs that do not affect the hazard classification , changes are detailed in section 16 of the SDS. The version number remains the same.
The EDQM also provides its users with a with a cumulative list containing all classification modifications . This list is available here(in English only), which is available on the Safety Information for Reference Standards: Safety Data Sheets (SDS) & Biohazard Statements page.