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Oxidation stability (OIT) as oxidation induction time or oxidation induction temperature via DSC

ISO 11357-6 Determination of Oxidation resistance via xidation induction time (isothermal OIT) or oxidation induction temperature (dynamic OIT) by Diffential Scanning Calorimetry (DSC). In the isothermal method, the sample is heated under nitrogen atmosphere to a defined temperature, then switched to an oxygen or air atmosphere and the time until oxidation begins is measured. In dynamic testing, the sample is heated under an oxygen or air atmosphere at a constant heating rate until oxidation occurs. The temperature at which oxidation begins is measured.

In short — AI-generated

The oxidation stability test determines the resistance of plastic materials to oxidative degradation using Differential Scanning Calorimetry (DSC) according to ISO 11357-6. The sample is either held at a constant temperature (isothermal) or heated at a constant rate (dynamic) while switching from an inert nitrogen atmosphere to an oxygen-rich environment to detect the onset of oxidation.

The resulting OIT value indicates the time or temperature at which the material begins to degrade, serving as a measure of the effectiveness of the incorporated stabilizers. In practice, this helps developers assess the long-term thermal stability and shelf life of packaging materials exposed to heat or oxygen.

Text is AI-generated; based on test method data curated and verified by Innoform.

Test Method Group: Material analysis

Norms:
  • ISO 11357-6 (2018-03) Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)

Required Sample Amount: 100 mg

Standard Tests

OIT dynamical (oxydation induction temperature)

Specific Norm: ISO 11357-6

The sample is heated under oxygen or air atmosphere at a constant heating rate to oxidation, measuring the temperature at which the oxidation starts.

OIT isothermal (oxydation induction time)

Specific Norm: ISO 11357-6

The sample is heated under nitrogen atmosphere at a defined temperature, then switched to an oxygen atmosphere and the time until the oxidation begins measured.
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