New manual on how to share information when preparing a CSR for REACH joint registration.


The new manual “REACH joint registration workflows for Chesar users” is now available in the support section of the Chesar website.

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Chesar 3.7.3 available for download


An update of ECHA's chemical safety assessment and reporting tool, Chesar, has been published. 

Chesar 3.7.2 available for download


An update of ECHA's chemical safety assessment and reporting tool, Chesar, has been published. Chesar 3.7.2 improves the security of the application by resolving an important security vulnerability related to XML External Entity Injection (XXE).

What is Chesar?

CHEmical Safety Assessment and Reporting tool

Chesar is an application developed by the European Chemicals Agency (ECHA) to help companies to carry out their chemical safety assessments (CSAs) and to prepare their chemical safety reports (CSRs) and exposure scenarios (ESs) for communication in the supply chain.

Chesar enables registrants to carry out their safety assessments in a structured, harmonised, transparent and efficient way. This includes the importing of substance-related data directly from IUCLID, describing the uses of the substance, carrying out exposure assessment including identifying conditions of safe use, related exposure estimates and demonstrating control of risks. Based on this, Chesar automatically generates the CSR and exposure scenarios for communication as a text document, and export information on use and exposure to IUCLID. Chesar also facilitates the re-use (or update) of assessment elements generated in a single Chesar instance or imported from external sources.






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