As soon as a material ceases to be waste, REACH requirements apply
in principle in the same way as to any other material. By-products
are exempted from REACH regulation, unless they are imported or
placed on the market themselves. A by-product consumed by the
same legal entity does not need to be registered, while the byproduct
placed on the market is regarded as a substance that
does need to be registered. In case the material is waste, then WFD
and Waste List Decision (EWC) provide the relevant rules