Functional Barrier Qualification for Mineral Oil Hydrocarbon Migration in Board
Functional barrier qualification requires gas chromatography verification of saturated and aromatic hydrocarbon migration below detection limits on creased board.
German Mineral Oil Thresholds
Regulatory Limit
National consumer protection standards in Europe restrict the migration of synthetic hydrocarbons from recycled paperboard packaging into dry and fatty foodstuffs. Adhering to the German mineral oil thresholds requires packaging manufacturers to limit both mineral oil saturated hydrocarbons and mineral oil aromatic hydrocarbons in finished cartonboard. These limits are designed to prevent the bioaccumulation of potentially hazardous compounds in human tissue.
Migration Control
Packaging converters use functional barriers to comply with these stringent chemical migration standards. When food-grade recycled board is used, an internal plastic or paper coating is applied to block the volatile gases that evaporate from printing inks used in old newspapers. These inks are the primary source of the hydrocarbons, which can travel through the gas phase and condense on the packaged food.
Testing must demonstrate that the barrier reduces the transfer of mineral oils to a level below the specified limits, which are often set in the low milligrams per kilogram range.
Analytical Compliance
Analytical laboratories verify compliance by extracting and chromatographying the mineral oil fractions from the paperboard and the food. Standard methods use gas chromatography combined with flame ionization detection to separate the saturated and aromatic hydrocarbon fractions. Demonstrating that the packaging remains below the German mineral oil thresholds is essential for securing contracts with major European retailers who demand strict chemical purity for their private labels.