| I'm no chemist. They were nice enough to provide repeat experiments in 3.5, figure 2. It shows the release of c-siloxane drops of dramatically after the first baking. Then it tapers off. That suggests to me this is not a structural component, but a solvent, softener, coating or similar that sits between the structural silicone. Otherwise, I'd expect reports of the silicone molds degrading after baking. Though I guess it could be material that simply didn't mate with a polymer chain. But that doesn't jive with the (sparse) Wikipedia article [1]. This doesn't say anything about whether they are inert. If they are inert and not meant to be bound to anything, then it makes sense they'll be washed away, and that doesn't matter (in the PFAS sense, where it turns out it does eventually matter :). The EU is looking at D4-6 because it's bioaccumulative. Canada (where this study is from) looks at D4 [2]. Overall, this looks like a very comprehensive study. Many aspects covered. I'd like to also complain that mixing "cyclic siloxane" with "c-siloxane" makes it much more difficult to search through the paper. Why not stick with one name? [1] https://en.wikipedia.org/wiki/Cyclosiloxane [2] https://en.wikipedia.org/wiki/Siloxane#Safety_and_environmen... |