Does Silicone Have Microplastics? What to Know Before You Cook

You swapped your plastic spatula for a silicone one. Maybe you added a silicone baking mat and a few reusable silicone bags. It felt like the safe choice. Then you read that silicone might shed microplastics too.

So, does silicone have microplastics? The short answer: silicone is not a traditional plastic, but it is a man-made polymer, and studies show it can release tiny particles and chemical residues under some conditions. The risk is highest when silicone is brand new, heated to high temperatures, or worn out. For everyday, cool uses, it remains one of the better options. Here is what the research says and what to do about it.

Is Silicone a Plastic?

Not exactly. Most plastics, like polyethylene and polypropylene, are built on a backbone of carbon. Silicone is built on a backbone of silicon and oxygen, the same elements found in sand and glass. That makes it more heat resistant and more flexible than most plastics.

But silicone is still a synthetic polymer, and many scientists group it with plastics when they study tiny particles. The common food-grade form is called polydimethylsiloxane, or PDMS. In the U.S., the FDA allows silicone rubber in food-contact products as long as it meets its rules for rubber articles meant for repeated use.

What to do: Treat silicone as "lower risk than plastic, not zero risk." Buy products labeled food-grade or platinum-cured, and skip cheap, no-name silicone with a strong smell.

Does Silicone Release Microplastics?

It can, under the right conditions. The clearest evidence comes from a 2022 study in Nature Nanotechnology. Researchers steam-sterilized silicone baby bottle nipples, the way parents normally clean them. The heat broke down the silicone surface and released flake-shaped particles from 0.6 to 332 micrometers across. The team estimated a baby could swallow more than 660,000 silicone-derived particles in the first year.

Two things matter here. First, this was repeated steam heat, which is harsher than most kitchen use. Second, the authors said the health effects of these particles are not yet known. The study shows silicone is not immune to shedding. It does not show that your spatula is harming you.

What to do: Replace silicone items that are sticky, cloudy, cracked, or flaking. Worn silicone is more likely to shed.

What Are Siloxanes, and Should You Worry?

Besides particles, silicone can contain leftover chemicals called cyclic siloxanes. These are small molecules left over from manufacturing. Three of them, known as D4, D5, and D6, were named "substances of very high concern" by the European Chemicals Agency in 2018 because they persist in the environment and build up in living things.

In 2025, Health Canada researchers tested 25 silicone baking products in the Journal of Hazardous Materials. Every product contained cyclic siloxanes. During baking, siloxanes moved into a food stand-in and spiked in the indoor air. The good news: emissions fell by about 95% by the third use. Most of what can come out seems to come out early.

Young children had the highest modeled exposure for their body weight. If grandkids spend time in your kitchen, that is one more reason to break in new bakeware before using it for food.

What to do: Before you bake food in new silicone, run it empty in a hot oven two or three times with the fan on or a window open.

When Is Silicone Most Likely to Shed?

The research points to the same few triggers again and again: heat, newness, and wear. Here is how common silicone items stack up.

Is Silicone Safer Than Plastic for Cooking?

For most uses, yes. Silicone handles heat better than polypropylene or polyethylene, which can melt, warp, or shed when hot. Swapping plastic storage bags and plastic spatulas for silicone still cuts down on single-use plastic in your kitchen.

The best choice for high heat, though, is not silicone at all. Glass, ceramic, cast iron, and stainless steel do not contain polymers to break down. If you want a broader game plan, our guide to hidden sources of microplastics in your kitchen walks through the biggest swaps room by room.

What to do: Save glass and metal for the oven and stovetop. Use silicone for cool storage and gentle stirring.

Start Here: If You Only Do Three Things

1. Break in new bakeware. Heat new silicone molds and mats empty a few times, with good airflow, before food touches them.
2. Keep silicone out of the hottest jobs. Bake in glass or metal when you can, and do not microwave or boil food in silicone bags.
3. Retire worn pieces. Sticky, cracked, faded, or flaking silicone goes in the trash.

For heat and plastic more broadly, see our article on whether your plastic kettle is adding microplastics to your coffee and tea.

Where Sifts Fits

Cutting down on exposure is the most important step, and that starts with the choices above. Some people also add an optional gut-support routine. Sifts is formulated with chitosan and other dietary fibers intended to support normal digestive and elimination processes as part of regular gut function.*

Sifts works in the digestive tract. It is not a substitute for better cookware, and it does not remove particles from your blood or organs. Sifts contains shellfish-derived ingredients and is not for people with shellfish allergies.

What the Science Still Cannot Tell Us

Researchers can now show that silicone sheds particles and releases siloxanes under certain conditions. What they cannot yet say is how much of that reaches the body from normal kitchen use, or what it does there. Most studies use lab simulations, not real meals. Treat the evidence as a reason for simple care, not alarm.

Frequently Asked Questions

Bottom Line

Silicone is a better choice than most plastics, but it is not perfectly inert. Break in new bakeware, use glass and metal for high heat, and replace silicone when it wears out. Those three habits keep most of the benefit and cut most of the risk.

Want a wider list of what to replace first? Read our guide to household plastics and what to replace first.

Sources: Journal of Hazardous Materials (Health Canada), silicone bakeware siloxane emissions, 2025; Nature Nanotechnology, steam disinfection of silicone baby teats, 2022; Food Packaging Forum, ECHA classifies cyclic siloxanes as SVHCs; U.S. eCFR, 21 CFR 177.2600 rubber articles for repeated use.