Do polypropylene food containers release nanoplastics into hot water?
Yes. A 2025 study found polypropylene food storage containers released nanoplastics and microplastics into water, with higher levels after 90 C rinsing.
What is actually in it
Polypropylene (PP) is the plastic used in many food storage containers and takeout tubs. It is often chosen because it handles heat better than some other plastics.
Heat resistance does not mean zero particle release. Very small plastic particles can still come off the surface during use.
What the research says
A 2025 study in J Agric Food Chem tested Australian-sourced polypropylene food storage containers under simulated-use conditions.
The study found nanoplastics from 0.01 to 3.7 ug/L and microplastics from 0.4 to 10.8 ug/L. Levels were higher after rinsing containers with water at 90 C than at room temperature.
The practical step is clear: do not pour hot food or hot water into polypropylene containers. Use glass storage for hot leftovers and reheating.
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 |