Tenax Migration Testing Parameters for Recycled Packaging Hydrocarbon Verification
Modified solid simulant Tenax TA testing under EN 14338 verifies gas-phase MOSH and MOAH migration from recycled paperboard without false-positive wax interference.
Temperature Acceleration Kinetics
Reaction Thermodynamics
The mathematical relationship that describes how chemical reaction rates and diffusion speeds increase when temperature rises is a fundamental concept in shelf-life and migration testing. In packaging evaluation, temperature acceleration kinetics are used to design rapid laboratory tests that simulate months of storage in just a few days. This methodology allows mills to quickly prove that their paperboard barriers will protect food over its entire commercial life.
Diffusion Mechanism
Elevated temperatures increase the kinetic energy of both the polymer barrier molecules and the volatile compounds trapped within the paperboard. This energy boost allows the volatile molecules to move faster through the polymer matrix, which shortens the time required for migration to occur. The relationship is governed by the Arrhenius equation, which calculates the equivalent exposure time at high temperatures to match long-term storage at room temperature.
Testing laboratories expose coated board to fifty or sixty degrees Celsius for ten days to simulate a full year of ambient contact.
Testing Integrity
Accelerating the test too much can cause the barrier polymer to melt or change its crystalline structure, which invalidates the results. The temperature must be kept below the glass transition point of the coating to ensure that the transport mechanism remains the same as in real-world conditions. This thermodynamic model allows converters to verify barrier performance without waiting for long-term storage tests to finish.