Chain Standard
Voluntary sustainability frameworks establish comprehensive chain of custody principles to ensure traceable sourcing of bio-based, circular and advanced material feedstocks. The normative document rsb std 20 001 defines the structural requirements for maintaining chain-of-custody integrity under the Roundtable on Sustainable Biomaterials certification system. It specifies traceability criteria for physical segregation, controlled blending and mass balance models applied to renewable biomaterials, non-fossil carbon inputs and recycled feedstocks.
The standard governs custody transfers across processing facilities, converters and distributors, ending where finished retail packaging reaches ultimate consumer markets.
Tracking Models
Supply chain operators choose between three primary custody tracking methods defined within the certification architecture. Under rsb std 20 001, physical segregation keeps certified bio-based materials isolated from non-certified stocks throughout pulping, papermaking and converting stages. Controlled blending permits physical mixing of certified and non-certified inputs while tracking exact input percentages through batch processing equipment.
Mass balance accounting allows certified bio-feedstocks to mix seamlessly with fossil resources in complex continuous chemical crackers, using strict credit bookkeeping to attribute circular claims to equivalent product volumes. Processing sites must document mass balances, conversion loss factors and stock inventory registers, reconciling certified inputs and outputs within maximum twelve-month auditing windows.
Integrity Control
Achieving and maintaining operational certification requires annual third-party audits of material management systems. An organization certified under rsb std 20 001 must operate a validated quality management system that records transaction certificates, product claims and supplier certification numbers for every incoming batch. Inaccurate volume reconciliations, unsubstantiated sustainability claims or unauthorized credit transfers across non-eligible operational sites trigger major nonconformances and risk certificate suspension.
Rigorous custodial governance protects industrial manufacturers against fraudulent supply claims. It ensures that packaging materials manufactured from certified bio-polymers or circular agricultural residues possess defensible environmental credentials.
