Auditing Virgin and Recycled Fiber Ratios in Paperboard Packaging
Auditing fiber ratios combines ISO 9184 furnish microscopy and ash testing with strict FSC and PEFC invoice-level mass balance chain of custody reconciliation.
Controlled Wood
Sourcing Standard
Virgin fibre that originates from known, non-controversial sources but has not yet achieved full forest management certification. Controlled wood provides a mechanism for mills to supplement certified stocks while ensuring the material does not come from illegally harvested forests or areas where high conservation values are threatened. It acts as a bridge for companies working toward broad sustainable procurement goals.
Verification Requirement
Organizations such as the Forest Stewardship Council establish the criteria used to evaluate these fibre streams. For a mill to use the controlled wood designation, it must implement a due diligence system to map its supply chain back to the forest of origin. This process involves risk assessments and field audits to confirm that the wood was not harvested in violation of traditional or civil rights.
The system prevents the mixing of acceptable material with wood from genetically modified trees or forests being converted to non-forest use.
Fibre Mix
Manufacturers often combine certified pulp with this grade to produce labeled products that meet percentage based claims. Using controlled wood allows for a more stable supply of raw materials in regions where full forest certification is not yet widespread. It ensures that the final paper or board product meets a minimum threshold of ethical sourcing.
Documentation of these volumes is mandatory for maintaining the chain of custody certification required by international retailers.