PTFE
https://en.wikipedia.org/wiki/Polytetrafluoroethylene#Ecotoxicity
Are you just leaving it out or substituting? Do you notice a difference?
I've never used it. I've only ever waxed with plain paraffin (unless you count the CeramicSpeed chain I've used on the TT bike that was prepared by them not me)
@greeno started
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https://en.wikipedia.org/wiki/Polytetrafluoroethylene#Ecotoxicity