The EU REACH Regulation requires registrants to complete a chemical safety assessment (CSA) and document it in a chemical safety report (CSR) for substances manufactured or imported at 10 tonnes or more per year per registrant. The legal text does not require exposure scenarios to be prepared for mixtures themselves, but formulators have a legal obligation to forward to their customers information relevant to exposure to their mixtures, which they have obtained from the exposure scenarios (ES) attached to the SDSs for their ingredient substances. End-users of mixtures also need to know how to handle those chemical products safely. Suppliers of substances are required to provide the ES in an annex to the SDS, as a so-called extended SDS (Ext-SDS). There are five options for suppliers to communicate contents of the substance ESs used in their mixtures: attachment of the actual exposure scenario(s), a summary of the exposure scenario(s), a link to the supplier's website where the exposure scenario(s) can be found, a reference to the supplier's website where the exposure scenario(s) can be found, or a statement that the supplier has not prepared an exposure scenario for the mixture.
