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@Chopsicle
But just to add more complexity to the issue, not all fluro-polymers are equal it seems. - I mentioned I was frustrated at the lack of info around different formulas, but it seems ePTFE has been deemed ok to continue using, its just the chemicals used in the formulation are the nasty stuff;
https://www.gore-tex.com/en_uk/sustainability/protect-the-planet/reduce-chemical-impacts
I originally thought - wrongly - that ePTFE membranes would be phased out.