The thermo‐oxidative degradation of PTFE in the NIST cup furnace toxicity test

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Abstract
Long‐lived end‐chain peroxy radicals have been detected during the thermo‐oxidative degradation of PTFE. These radicals are associated with the fine particulate, which is the established cause of the ultra‐high toxic potency of PTFE produced under the conditions employed. The particulate has been further characterized by a vareity of thermo‐analytical methods. Fluid‐flow modelling analysis has been used to simulate the recirculatory behaviour, characteristic of the NIST cup furnace toxicity test, which may effect the continuous regeneration of the toxicity.