Meaning
Statutory assessment provisions under European Union plastic food-contact legislation establish the analytical protocol required to confirm the safety of non-intentionally added substances and unlisted reaction intermediates. Regulation (EU) 10/2011 relies on article 19 to mandate that potential chemical migrants outside the positive union list of authorized substances undergo toxicological evaluation through internationally recognized risk assessment principles. The clause governs conversion break-down products, synthetic impurities, polymer degradation fragments, and volatile residues that develop during compounding or melt injection.
Compliance boundaries terminate where migration levels remain below analytical detection limits or where specific structural migration thresholds are proven safe through chemical toxicology profiles.
Safety Proof
Toxicological safety demonstration under this provision obliges the converter or brand owner to conduct extraction testing followed by chromatographic risk profiling. Manufacturers screening compounded food-packaging grades must identify decomposition fragments generated under thermal shear during plasticizing. Virgin resins normally show clean baseline traces, whereas recycled polyolefins introduce process additives, thermal scission fragments, and contaminant cross-products that require deep screening.
Migration models often screen unlisted compounds against the threshold of toxicological concern concept. The burden of proof remains with the business operator placing the converted container into commerce.
Degradation Control
Barrel temperature profiles and residence durations in injection units dictate the volume of thermal scission products requiring evaluation. When melt temperatures drift upward during polyolefin processing, oxidative chain breakdown multiplies the concentration of short-chain carboxylic acids and aldehydes. These unlisted compounds bypass virgin specification sheets but emerge dynamically inside the mould cavity.
Processing regrind resin introduces compounded risk because previous thermal histories generate hydroperoxides that trigger auto-oxidation cycles. Scrap reclamation loops require strict processing windows to prevent compound generation beyond toxicological tolerances.
Analytical Screening
Gas chromatography paired with high-resolution mass spectrometry isolates the trace volatiles released under accelerated food-simulant extractions. Non-target screening evaluates spectra against reference libraries to assign risk classes to unlisted chemical entities. Raw resin certificates verify virgin input purity, but only migration testing of the finished article validates compliance under article 19.
