Dear Imtiaz afzal Khan

PE (Usually ti may be LDPE), in particular, which is widely used in pipe manufacturing is susceptible to oxidation, which weakens the pipe over time and increases the likelihood of failure.

Dear S Kalaisalven,

Thanks for the response but my question is why OIT was not measured for PVC pipes or materials?

The main reason for not using OIT for PVC-U (unplasticized) is because PVC reacts completely different at high temperatures during the measurement: it decomposes, releasing hydrogen chloride - whereas PE is being oxidized with air oxygen.

Briefly: the Oxygen Induction Time/Temperature (OIT-) method is not suited for being applied to PVC.

OIT measurements in PVC are unusual. Maybe you can contact the authors of the attached paper to get more detailed information. Hope it helps.

Thanks to Jose Filho and Roland Wilder for kind response,

I will look into it.