ISO 11357-6

Thermal Characterization

Suppliers report this value on datasheets to verify the efficiency of the stabilization package added to virgin resin. Moulders monitor the drop in oxidation induction time during processing to decide if regrind percentages remain viable for production. Excessive heat in the barrel consumes stabilizers and leaves the material prone to brittleness during the life of the component.

The standard allows for isothermal scans that provide data on the chemical aging rate under stress. Data generated from a small slice of a finished moulded part identifies if the melt history compromised the protective chemistry of the base polymer. A manufacturer compares the result of a virgin pellet against the finished article to quantify the loss of performance caused by repeated extrusion.

Process Stability

Injection moulding machines that run with high back pressure or excessive temperatures degrade the molecular structure of the plastic by depleting the antioxidants. The test measures the remaining duration of induction before the onset of oxidation during an oxygen purge. An operator detects potential issues with machine cooling or residence time by observing a downward trend in these measured times across a production batch.

Stable results suggest that the additive package remains effective throughout the transformation from pellet to finished geometry. When results fluctuate, the process exhibits a variance in its ability to prevent premature failure. Short induction times on the shop floor indicate a need to lower barrel temperatures or adjust the drying parameters to preserve the chemical integrity of the resin.

Material Validation

Procurement departments hold resin lots against the minimum requirements set by the specification to ensure consistency between shipments. A low result indicates that the antioxidant concentration fell below the limit required for the final application of the component. The measurement helps differentiate between material grades that contain different levels of heat stabilization.

It detects if a change in the supply chain introduced a less stable resin that fails during the moulding stage. A material that passes this test demonstrates the thermal resilience required for long term exposure to oxygen. High oxidation resistance remains a physical property of the stabilized polymer.