Health Canada says this about siliconehttp://www.hc-sc.gc.ca/hl-vs/iyh-vsv/pr ... er-eng.php
Silicone is a synthetic rubber which contains bonded silicon (a natural element which is very abundant in sand and rock) and oxygen.
Cookware made from food grade silicone has become popular in recent years because it is colorful, nonstick, stain-resistant, hard-wearing, cools quickly, and tolerates extremes of temperature. There are no known health hazards associated with use of silicone cookware.
Silicone rubber does not react with food or beverages, or produce any hazardous fumes.
-----I wish there could be certainty. Silicone cookware is pretty, lightweight, doesn't get hot, and lasts forever I'd think unless poked or cut. Sigh----To be or not to be a guinea pig, that is the question.