Chesar 3.6 – soon to be released

During 2018, ECHA and SECO, under the umbrella of ENES  and with the support of the exposure estimation tool owners, worked towards the harmonisation of the conditions of use (and their values) of the most commonly used worker exposure estimation tools in the REACH chemical safety assessment. The outcome of the work, which is described in this document, is a comparison table in which the conditions of use needed as input for ECETOC TRA, ART, MEASE, Stoffenmanager and EMKG-Expo have been mapped to a set of harmonised conditions of use.

These new harmonised conditions of use are included in Chesar 3.6, which is planned to be released in January 2021. Implementing these harmonised conditions of use in Chesar will lead to the update of some existing (built-in) conditions of use already present in Chesar, as well as the addition of new ones specific for the above-mentioned exposure estimation tools. These tool-specific conditions of use can then easily be added to a contributing scenario when reporting the exposure estimates derived with one of the tools mentioned above.

By integrating these harmonised conditions of use, Chesar 3.6 will ensure a higher level of consistency in the exposure scenarios generated when the results of different tools are reported. The harmonisation will also ensure a more consistent communication on safe use to recipients of Safety Data Sheets.

This harmonisation will also affect the structure of the Sector-specific Worker Exposure Descriptions (SWEDs) as part of the published use maps. To prevent inconsistency, the use map developers, with the support of ECHA, will publish an updated version of their use maps in Chesar format around the same time as the release of Chesar 3.6. The updated use map Chesar files will all be available in ECHA’s use map library.

To support Chesar users, a webinar will take place on 20 January 2021. In this webinar, the implementation of the harmonised conditions of use in Chesar 3.6 will be further explained. The webinar will be followed by a Q&A session. More information can be found here. Save the date!

Finally, we invite all Chesar users to download the latest version of the ESCom catalogue (version 5.2) in Chesar format, which is expected to be published soon on and import it in their Chesar installation.

More information: Harmonised workers’ conditions of use / The use maps library

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