Are silicone baking mats and molds safe to use at high oven temperatures?

What's actually in it

Silicone baking mats, muffin molds, and spatulas are made from polydimethylsiloxane (PDMS), a synthetic polymer. Silicone is more heat-stable than most plastics, which is why it's marketed for oven use. But "more stable" doesn't mean nothing comes off. Silicone products can contain residual chemicals from manufacturing, including catalysts, plasticizers, and cyclic siloxanes (D4, D5, D6).

Some cyclic siloxanes are suspected endocrine disruptors. They can volatilize (turn to gas) at oven temperatures and then condense onto your food as it cools.

What the research says

A 2026 study in Food Chem used high-resolution mass spectrometry to screen chemicals that transfer from food contact materials during cooking. While the study focused broadly on plastic materials, the methodology applies to all polymer-based kitchen tools. It found that food contact materials release hundreds of compounds that migrate into food during heat exposure, many of which had never been identified before.

Research specifically on silicone has found that new silicone products release more chemicals than well-used ones. The first few uses tend to have the highest off-gassing. At temperatures above 220C (428F), volatile siloxane compounds increase significantly.

Food-grade silicone is generally considered safer than nonstick coatings or plastic wraps for baking. But the quality varies widely between brands. Cheap, thin silicone products may contain more filler materials and residual chemicals than higher-quality versions.

Before first use, "cure" new silicone bakeware by heating it empty in the oven at 200C (400F) for one hour. This drives off residual volatiles. Stay within the manufacturer's temperature limits. Choose thick, high-quality food-grade silicone from reputable brands, and avoid bargain versions with a strong chemical smell.