Ummm... tail? C2F4 doesn't have one. It will form a polymer, but it doesn't have a tail. As I mentioned sulfates may be a byproduct in some manufacturing (preci

Ummm... tail? C2F4 doesn't have one. It will form a polymer, but it doesn't have a tail. As I mentioned sulfates may be a byproduct in some manufacturing (precipitation) processes, but not in cookware where their contamination would be absolutely critical at ppm levels. Perhaps you mean the coordinating Oxygen in PFA or the Sulfur in PFOA, PFOS (ScotchGuard)? Those chemicals are known to be toxic and contaminated many marine animals and watersheds... some are regulated, some are not, and some companies have ignored the regulation, or the regulators have ignored the pollution. It's bad, but not relevant to teflon PTFE per se.