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6PPD is exceptional in terms of ensuring tyre and passenger safety and has been used for decades. It serves an essential safety function, protecting the components of the tyre from attack by ozone and oxygen.
Tyre composition cannot responsibly be modified without great care, including extensive and rigorous testing. Any material identified as a possible alternative must continue to ensure comparable performance in a tyre and continued compliance with federal safety regulations.
In late 2020, USTMA petitioned DTSC to list 6PPD in tyres as a priority product under the SCPR due to recent studies suggesting environmental concerns from a newly identified 6PPD transformation product, 6PPD-quinone (6PPDQ).
After a robust regulatory process, DTSC agreed with USTMA’s request and listed motor vehicle tyres containing 6PPD as a priority product, effective October 1, 2023. USTMA sought the listing because California’s AA process provides a rigorous, transparent, and science-based regulatory framework to thoughtfully screen and analyse possible alternatives to 6PPD in tyres.
“The safety, performance and sustainability of our products remains our uncompromising priority, and there is important work to be done to ensure any potential alternatives meet that high standard,” said USTMA President/CEO Anne Forristall Luke.
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