On November 12, 2019, the European Chemicals Agency (ECHA) will hold a webinar on the amended information requirements for nanoforms under the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulation. As reported in our December 4, 2018, blog item, the European Commission (EC) announced on December 3, 2018, that it adopted amendments to several REACH Annexes to clarify the information requirements for nanomaterials. The amended requirements will apply beginning January 1, 2020. ECHA states that the updated Annexes introduce new concepts: nanoform and a set of similar nanoforms. The updated REACH Annex VI also defines specific characterization parameters for the nanoforms of substances. The first part of the November 12, 2019, webinar will explain what a nanoform is and how to build a set of similar nanoforms. It will also explain how to fulfil data requirements for the characterization of nanoforms. The second part will introduce new International Uniform Chemical Information Database (IUCLID) fields for reporting the characterization parameters of nanoforms and give some practical examples on how to use the different fields. Attendees will also have the chance to ask questions from ECHA’s experts.