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Under sun radiation exposure, 6PPD converts to 6PPD-quinone, what is called a diketone, or a molecule made up of two ketone groups.

One major source for these diketone molecules is the tires themselves.

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.

If the oil is used in fuel or other materials, the diketone molecules go along for the ride, which is a problem.