Depending on the type of use, different compliance deadlines apply. Notifiable hazardous mixtures for consumer and professional use had to be submitted by 1 January 2021, whereas harmonised poison centre notifications for mixtures intended for industrial use only are not required until 1 January 2024. REACH does not clearly define the terms "professional" and "industrial", and this makes it difficult to assign the correct type of use. As "use type" is a required descriptor in the chemical safety assessment, the European Chemicals Agency (ECHA) provides assistance in its "Guidance on information requirements and chemical safety assessment to support the assignment" ...