EU 10/2011 Compliance

Migration Testing

Laboratories measure the transfer of chemical species from a resin into specific food simulants such as ethanol or acetic acid to determine regulatory adherence. Producers perform these assessments across various time and temperature conditions to replicate real food packaging exposure. A result below the migration limit verifies that the additive package stays stable during the conversion process from pellet to finished article.

Moulders who switch to regrind material increase the potential for exceeding these limits because the repeated thermal history of recycled resin shifts the molecular weight distribution and increases the mobility of low weight components.

Process Variables

Cooling rates and melt temperatures during injection moulding dictate the crystallinity of the finished part, which directly influences the rate of migration for mobile molecules. Low mould temperatures lead to amorphous surface layers that allow faster molecular diffusion than highly crystalline regions. Accurate control of the injection pressure ensures that surface density remains consistent across the entire cavity surface.

Drift in these machine settings often results in a part that fails a migration test even when the base material formulation sits well within the safety window.

Material Validation

Datasheets provide the foundational evidence for compliance but they only represent the resin in its virgin, unprocessed state. Moulders define their own final validation by testing samples taken from the actual production run rather than relying on generic lab reports provided by raw material suppliers. Every individual tooling configuration and cycle time adds potential variables that modify the chemical profile of the final article.

Validation demonstrates that the production environment maintains the safety profile of the food contact material throughout its manufacturing lifecycle.