Laboratory Testing Protocols for Recycled Paperboard Chemical Compliance
Recycled paperboard chemical compliance demands specific migration testing via Tenax and LC-GC-FID to quantify MOSH MOAH transfer before signing declarations.
PFAS
Fluorochemical Chemistry
Synthetic perfluoroalkyl and polyfluoroalkyl substances provide extreme water, grease and oil repellency when applied as wet-end additives or surface coatings. Belonging to the broad class of PFAS, these fluorinated organic compounds contain carbon-fluorine bonds that resist chemical, thermal and biological degradation. This chemical treatment enables lightweight paper packaging, fast-food wrappers, microwave popcorn bags and moulded pulp plates to resist hot grease penetration.
Its application scope stops applying where physical barrier polymers, silicone coatings or aqueous bio-based barrier dispersions replace fluorochemical sizing.
Surface Repellency
Lowering surface energy via fluorinated polymer sizing prevents oily liquids from wetting and penetrating the cellulosic matrix. Formulators incorporated short-chain and long-chain PFAS variants into paper formulations to achieve high grease resistance ratings under standard test conditions. The chemical treatment forms an oleophobic monolayer across individual cellulose fibres without forming continuous plastic films.
These fluorinated treatments maintain grease holdout even through sharp creases and heat-sealed package folds.
Regulatory Prohibition
Environmental persistence and biological accumulation have led global regulatory agencies to restrict or eliminate fluorochemical treatments from food packaging. Paper mills face strict prohibitions against using intentional PFAS chemistries in food wrappers and take-out containers. Recycled paperboard streams face continuous monitoring to ensure legacy fluorinated chemicals do not exceed allowable trace thresholds.
Procurement teams switch to aqueous mineral coatings, modified starches and cellulose nanofibrils to provide non-fluorinated oil resistance. Sourcing policies require verified testing to ensure supplied paper packaging remains free from added fluorochemicals. Regulatory phase-outs continue to reshape barrier chemistry across global packaging supply chains.
A Converter Certificate That Does Nothing for an Uncertified Mill
A converter's chain of custody certificate cannot retroactively grant certified status to packaging made from uncertified paper mill substrate.