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UK tyres are ending up in these Indian pyrolysis plants, despite legitimate official paperwork stating they are headed for legal Indian recycling centres.

While others in the field have attempted to break tire materials down using high heat, through a process known as pyrolysis, 6PPD is stubborn and the diketone molecules remain in the oil left behind.

ProPublica explored the most popular form of chemical recycling, pyrolysis; we found it is so inefficient that it yields products with almost no actual recycled content.

The EPA did not comment directly on the policy’s implications for pyrolysis or mass balance.

I spent months investigating one of those technologies, a form of chemical recycling called pyrolysis, only to find that it is largely a mirage.