Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what assessment he has made of the potential merits of utilising the mass balance approach to measure chemical recyclate.

Chemical recycling offers a potential complementary route for plastic recycling where mechanical recycling is impractical or uneconomic.

Mass balance is one of several chain of custody models that is used by industries to track materials through a complex value chain and can, in principle, be used to determine recycled content in a product. It is important that mass balance does not allow for overclaiming of the recycled content in plastic.

In general, chain of custody models are used in different industries to track all steps and inputs in a supply chain for a product.