The Committee for Risk Assessment (RAC) of the European Chemicals Agency (ECHA) met in September to address a number of pressing issues. Microplastics once again took centre stage however. Stakeholders were invited during the meeting to better clarify the points of the proposed restriction on microplastics. A heated discussion eventually arose on the definition of microplastics given by ECHA’s proposed restriction. Stakeholders notably disagreed on the elements of the microplastic definition; substances excluded from the definition; natural polymers (not chemically modified) and biodegradable polymers. In particular, the lower limit of 1nm indicated in the definition was much debated. Read the full meeting debrief here.