My Concern Here...
...Is that silicone bakeware is a new concept, and it often takes a while for hazards to become evident, no matter what the studies show when a material is first invented.
The example is Teflon. When this PTFE (polytetrafluoroethylene) coating was introduced in the early '60s, it was considered perfectly safe. Early instructions for Teflon cookware told consumers that scratched cookware would retain its nonstick properties, making no mention of where the tiny flakes of Teflon loosened during the scratching process would end up (in the food, of course). There was also no mention to consumers of the offgassing PTFE does when it is heated to excess.
Today, forty-five years later, we know that the offgassing is harmful, particularly to birds, where it can be fatal. Today's advice for Teflon use advises discarding cookware that is scratched or peeling.
But how many parakeets and budgies were affected in the meantime? How many people are walking around with flakes of PTFE lodged in some crevice of their digestive system, waiting to cause problems? While PTFE is supposedly not carcinogenic in and of itself, studies have shown that around 95% of Americans show traces of PFOA (perfluorooctanic acid), which is a breakdown product of PTFE, in their bloodstreams. PFOA is a suspected carcinogen.
So, my concern here is that the science is not all in on silicone bakeware, and even if dangers are known, manufacturers have a vested interest in seeing to it that we don't get one single blessed scrap more information than is necessary under the law. Even today, when Dupont admits that PTFE offgassing and flaking is problematic, there is a lot of public relations "spin" around these subjects on their website.
I am not saying that I know something no one else knows. I am saying that I don't think anyone yet knows the long-term effects of this new use for silicones (or they do know and aren't saying any more than is necessary) so I'm being careful about the stuff.
Offer void where prohibited. Objects in mirror are closer than they appear. Your mileage may vary.