Do PP takeout containers shed nanoplastic when you pour cold water too?
Yes, but heat releases more. A 2025 study found polypropylene containers released microplastics and nanoplastics into room-temperature water and 90 C water.
What's actually in it
Polypropylene, or PP, is a common plastic used for takeout tubs and food storage. It can shed tiny plastic pieces when water touches it.
Nanoplastics are smaller than 1 micrometer. Microplastics are larger pieces, up to 5 millimeters.
What the research says
A 2025 study in Journal of Agricultural and Food Chemistry tested PP food containers under simulated use. The containers released PP nanoplastics and microplastics into room-temperature water and 90 C water. The hot-water test released more.
That does not prove one cold takeout meal is dangerous. It does show that PP food containers can add plastic particles to water even without heating.
For daily leftovers, use borosilicate glass or stainless steel when you can. Let hot food cool before it touches plastic, and do not reheat food in PP takeout tubs.
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 |