Depending on the supply chain model, a legal entity shall be classified as a manufacturer, importer, or downstream user following the definition set in Article 3 of the REACH regulation. It is also possible that one entity takes multi roles, such as both manufacturer and importer roles, for the same substance. Each role will correspond to a set of REACH requirements. Therefore, it is critical to correctly verify the role of each substance. Manufacturer is any EU-based natural or legal person who manufactures a substance within the EU Importer is any EU-based natural or legal person who is responsible for the import of a substance Downstream user is any EU-based natural or legal person, other than the manufacturer or the importer, who uses a substance, either on its own or in a mixture, in the course of his industrial or professional activities. It should be noted that a distributor or a consumer is not a downstream user under REACH.