Based on the Wikipedia entry [0], it looks like 6PPD binds to the extra oxygen atom in ozone to convert it to regular O2, so it would be used during the life of

Based on the Wikipedia entry [0], it looks like 6PPD binds to the extra oxygen atom in ozone to convert it to regular O2, so it would be used during the life of the tire to prevent cracking. I just read that ozone will cause cracks in regular rubber bands over time, I never knew that was the cause [1]. Interesting. [0] https://en.wikipedia.org/wiki/6PPD https://en.wikipedia.org/wiki/6PPD [1] https://en.wikipedia.org/wiki/Ozone_cracking https://en.wikipedia.org/wiki/Ozone_cracking