Migration Testing

Laboratory Extraction Methods

Test protocols place substrate samples in migration cells where only the intended food-contact surface touches the designated liquid or solid simulant. For dry and fatty food applications, porous packaging specimens encounter Tenax adsorbent powder at elevated temperatures matching accelerated shelf-life conditions. Overall migration analysis measures total non-volatile substance mass extracted per unit of packaging surface area, recorded in milligrams per square decimeter.

Specific migration testing tracks target chemical species, including benzophenone derivatives, primary aromatic amines, and phthalate compounds, against toxicological thresholds. High-resolution chromatography coupled with flame ionization detection determines whether mineral oil saturated hydrocarbons and aromatic hydrocarbons migrate across paperboard barrier layers.

Compliance Scope Boundary

Barrier testing measuring pure water vapor transmission or oxygen gas permeation rates does not constitute chemical substance migration analysis. Heavy metal testing through complete acid digestion of packaging materials measures total structural elemental content rather than chemical transfer kinetics. Direct olfactory taint and odor evaluations evaluate sensory perception changes rather than regulated mass transfer thresholds.

Secondary packaging elements insulated from primary containers by functional impermeable barriers, such as thick aluminum foil or glass, remain exempt from direct migration extraction testing. Analysis ceases to apply when food contact occurs under operational temperature or storage conditions outside the standardized exposure matrices defined in applicable statutory protocols.