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.
Rolling 12-Month Balance Period
Meaning
A continuous accounting window of twelve consecutive months tracks the reconciliation of certified polymer inputs and outputs. This rolling 12-month balance period allows plastics manufacturers to smooth out seasonal fluctuations in the supply of recycled resins. Moulders use this timeframe to balance their physical inventory against their mass balance credits over a prolonged period rather than on a monthly basis.
This mechanism provides operational flexibility while preventing the infinite carrying forward of unused credits.
Material Efficiency
Fluctuations in the quality and availability of post-consumer resin require flexible sourcing strategies. The rolling 12-month balance period enables compounding plants to purchase high volumes of recycled material when available and use the credits over the subsequent months. This flexibility is crucial because the physical properties of recycled feedstocks can vary, and molders may need to adjust their blending ratios depending on the polymer grade.
This window allows them to balance material shortages without losing their certified status. It also accommodates the seasonal availability of certain plastic waste streams without disrupting the continuous production of high-quality molded parts.
Production Limit
Production scheduling benefits from this extended accounting period because it allows molders to group certified production runs together. Instead of running small, inefficient batches every month to meet short-term balance requirements, factories can run large campaigns. The rolling 12-month balance period ensures that the credits generated during these major runs can be allocated to products shipped throughout the year.
This efficiency reduces the purging scrap and downtime associated with frequent material changeovers.
Financial Consequence
Failure to balance the ledger within this annual window results in the expiration of certified credits. This expiration represents a direct financial loss, as the premium paid for the recycled feedstock cannot be recovered through the sale of certified products. Processors must manage their sourcing and sales pipelines to ensure that all credits are allocated before they expire.