One of the most widely applicable chemical recycling technologies is a thermal decomposition under absence of oxygen called pyrolysis. It is capable of processing mixed and contaminated plastics. In BASF's ChemCycling® project technology partners process mixed plastic waste or used tires into secondary raw material, the so-called pyrolysis oil as main output. The oil is fed into our production system at the beginning of the value chain and processed into new plastics. Contaminations in the waste feedstock are removed by thermal decomposition, chemical conversion, and purification. The recycled feedstock is attributed to the products manufactured in the BASF Verbund system using a mass balance method.