Meaning
Harmonized European testing standards specify analytical methods for determining total non-volatile chemical substance transfer from plastic materials into food simulants. Compliance under en 1186 overall migration measures the cumulative gravimetric loss of material constituents into liquid media representing aqueous, acidic, alcoholic and fatty foods. The standard applies to virgin and converted plastic articles intended for direct contact with food, establishing an absolute legal limit of ten milligrams per square decimeter of food contact surface or sixty milligrams per kilogram of food simulant, while stopping short of identifying individual chemical molecules.
Simulant Exposure
Standardized laboratory testing exposes plastic specimens to specific food simulants under controlled duration and temperature cycles. Simulants include distilled water, three percent acetic acid, ten percent or higher ethanol solutions, and vegetable oil or substitute organic solvents such as isooctane and ninety-five percent ethanol. Articles intended for long-term ambient storage or high-temperature retort face rigorous thermal conditioning under en 1186 overall migration methods.
Following the prescribed exposure contact period, the simulant is evaporated to dryness, and the remaining non-volatile residue is measured on high-precision gravimetric balances.
Material Performance
Resin additives, oligomers, lubricants and low molecular weight polymer fractions migrate readily under aggressive simulant conditions. High density polyethylene and polypropylene formulations must contain clean, approved stabilizer packages to prevent excessive extraction into fatty food simulants. Converters using excessive internal slip agents, antistatic additives or processing waxes risk exceeding the ten milligram migration limit.
Internal regrind must be tightly managed, as thermal processing cycles generate degraded short-chain fractions that easily dissolve into extractant media. Sourcing teams demand low-migration polymer grades specifically validated for high-fat or high-temperature contact applications.
Compliance Verification
Legal authorization for food packaging distribution requires accredited laboratory test reports showing overall migration values comfortably below statutory limits. Converting operations cannot rely solely on resin technical datasheets because thermal processing in extruders and blow moulders alters additive degradation and migration kinetics. Production quality control plans include periodic en 1186 overall migration verification to ensure that process parameters or masterbatch alterations have not compromised food contact compliance.
Validated test results form a central pillar of the regulatory compliance file required across European packaging markets.
