Oxidative-induction time
Oxidation induction time or OIT is a standardized test performed in a DSC which measures the level of thermal stabilization of the material tested. The time between melting and the onset of decomposition in isothermal conditions is measured. The atmosphere is nitrogen up to melting and then oxygen. The typical temperature is 190-220 °C.
Characteristic DSC curve for a polyethylene, the OIT is measured
This test is routine when assessing the quality of organic materials or polymers, such as polyethylene pipes.
References
- ISO 11357-6:2018 Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
- Norm ASTM D 3895
- Nexor pipes
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