Is it safe to use a plastic steamer basket in a pot?
Avoid it for regular cooking. Steam is hot, and a plastic basket sits near food the whole time.
What's actually in it
A plastic steamer basket sits inside a hot pot while steam moves through your food. It may be polypropylene, nylon, or another heat-rated plastic. The label may say it is made for cooking, but the basket still gets heat, water vapor, and food contact at the same time.
That matters most when the basket is old, scratched, stained, warped, or touching the hot sides of the pot. Steam is not gentle on plastic. It is hot water vapor trapped under a lid.
What the research says
A 2025 study in J Agric Food Chem tested polypropylene food containers and found nanoplastic and microplastic release into water. Release was higher after rinsing at 90 degrees C than at room temperature.
A 2021 study in Food Chem Toxicol assessed migration from several food-contact plastics. The study found low concern under tested regulatory conditions, but it also shows the key point: migration depends on the plastic, the food, and the use conditions.
For daily steaming, use a stainless steel insert or a plain bamboo steamer. If you already own a plastic basket, keep it away from the pot bottom, do not use it for oily baby food or long cooks, and replace it when it warps or feels rough.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Release of Nanoplastics from Polypropylene Food Containers into Hot and Cold Water. | J Agric Food Chem | 2025 |
| Migration of substances from food contact plastic materials into foodstuff and their implications for human exposure. | Food Chem Toxicol | 2021 |