Free Attribution

Mass Allocation

Co-processing circular pyrolysis oil with conventional naphtha yields mixed monomer outputs that enter complex downstream chemical plants. Under free attribution, chemical producers transfer circular mass balance credits to high-margin engineering resin lines, marketing those specific batches as one hundred percent recycled content resins. The physical resin pellets contain a statistical mixture of virgin fossil and recycled carbon atoms, but the commercial documentation carries the full environmental credit.

This allocation approach enables rapid scale-up of chemical recycling without building redundant, dedicated polymerization lines.

Sustainability Accounting

Brand owners purchase certified mass balance resins to meet public post-consumer recycled content commitments without altering moulding process settings. Utilizing free attribution records allows moulders to maintain identical processing temperatures and mechanical part performance achieved with virgin resins. Chain of custody audits perform detailed mass balance reconciliations to ensure that credited output quantities do not exceed verified circular feedstock inputs.

Verification Limit

Mass balance accounting rules face increasing scrutiny from environmental regulators requiring physical molecular traceability. Future regulatory shifts may restrict unrestricted credit transfer across disparate chemical product lines.