The objective of this work package is to develop an applicable biocatalytic process for the depolymerisation of polyethylene terephthalate (PET) and polyurethane (PU) materials into their functional monomers and oligomers. The efficient degradation of post-consumer PET and PU materials will be achieved by selecting and engineering PET- und PU-degrading enzymes with high hydrolysis rates and process stability.