ISO 22095 Mass Balance Chain of Custody Audit Requirements
ISO 22095 mass balance audits demand strict site boundaries, verified baseline yield conversions, and zero negative credit balances across accounting periods.
Monomer Attribution Barriers
Meaning
Accounting constraints in mass balance chains of custody impede the transparent allocation of chemically recycled monomer streams to specific polymer batches. Unresolved monomer attribution barriers arise when chemical recycling facilities feed mixed pyrolysis oil into shared steam crackers or catalytic crackers alongside fossil inputs. The physical co-processing obscures exact molecular origin, requiring mathematical allocation rules that regulatory frameworks or commercial buyers may refuse to recognize.
These limitations govern trade certification and environmental labeling for chemical recycling, stopping where physical segregation of recycled monomer streams eliminates attribution ambiguity.
Regulatory Divergence
Divergent regional rules define which mass balance attribution models are legally valid for compliance claims. Fuel use exemptions in some jurisdictions prevent manufacturers from allocating recycled mass to high-value polymer products. Regulatory uncertainty creates commercial friction during cross-border polymer trading.
Allocation Rule
Free attribution methods allow companies to concentrate recycled content claims on selected product lines. Proportional allocation models distribute recycled fractions evenly across all output streams. Disagreements between industry standards complicate sustainability reporting for converted plastic goods.
Audit Traceability
Independent auditors require rigorous mass balance ledger entries to verify environmental claims. Gaps in chain-of-custody documentation invalidate marketing declarations of recycled content. Standardised digital ledgers help overcome verification hurdles across complex supply networks.