Can silicone bakeware expose you to cyclic siloxanes through food and air?

What's actually in it

Silicone bakeware is made from polydimethylsiloxane (PDMS) mixed with fillers and catalysts. During manufacturing, not all the silicone polymerizes completely. Leftover cyclic siloxanes (D4, D5, D6) remain trapped in the material. When heated in the oven, these volatile compounds escape into both the food and the surrounding air.

D4 is classified as a reproductive toxicant in the EU. D5 is a suspected endocrine disruptor. You get a double dose: from the food you eat and the air you breathe while baking.

What the research says

A 2025 study in J Hazard Mater measured cyclic siloxane release from silicone bakeware through both routes: into baked food and into the air. The study found measurable levels of D4, D5, and D6 in both food and air samples during normal oven use.

Higher oven temperatures released more siloxanes. But even at standard baking temperatures of 180 to 200C (350 to 400F), the levels were enough to raise exposure concerns, especially for the inhalation route. Your kitchen fills with siloxane vapor every time you bake with silicone.

The combined exposure from eating the food and breathing the air pushes daily intake closer to health-based limits than either route alone. Metal or glass baking pans don't release these compounds and are safer alternatives for regular oven use.