If you manufacture chemical substances or import them from outside the EU above one tonne per year, you may have registration obligations under REACH. Additionally, if you manufacture or import a product (mixture, article), it may contain substances that need to be registered individually.
If you have pre-registered substances that you manufacture or import from outside the EU above one tonne but not more than 100 tonnes per year and have not already registered them, the REACH registration deadline of 31 May 2018 concerns you.
CLP and REACH helpdesk:
85 days ago - Reach 2018 Chemicals Legislation