Not all food storage containers are microwave-safe, so you should only microwave containers labelled microwave-safe and always vent the lid. Most glass containers are microwave-safe (lids off or vented), while plastic is only safe if specifically rated, since some plastics can warp or degrade. Stainless steel must never go in the microwave. When in doubt, transfer food to a microwave-safe glass dish or plate. This guide explains which food storage containers are microwave-safe and how to use them.
Only microwave containers labelled microwave-safe, with the lid vented. Most glass is microwave-safe; plastic only if rated; never microwave stainless steel. When unsure, use a microwave-safe glass dish or plate.
Which Containers Are Microwave-Safe?
| Material | Microwave-safe? |
|---|---|
| Tempered glass (lid off/vented) | Yes (most) |
| Microwave-safe plastic | Yes, if labelled |
| Other plastic | No (can warp/degrade) |
| Stainless steel | No (never) |
| Containers with metal trim | No |
Key Takeaway: The label is the rule. A container is microwave-safe only if it says so; glass usually is, plastic only sometimes, and metal never. When in doubt, tip the food onto a plate rather than risk a warped or degraded container.
Always Vent the Lid
Even microwave-safe containers should have the lid removed or vented, because trapped steam builds pressure and can pop the lid or crack the container. Leave a corner open or remove the lid.
Glass in the Microwave
Most tempered glass is microwave-safe with the lid off. It reheats evenly and resists stains. See best glass food storage containers.
Plastic in the Microwave
Only microwave plastic labelled microwave-safe, and vent the lid. Some plastics warp or degrade with heat. See are plastic containers safe.
Never Microwave Metal
Stainless steel and any container with metal trim must never go in the microwave, as metal causes sparks and damage. See plastic vs stainless steel.
FAQ
Are food storage containers microwave-safe?
Only those labelled microwave-safe. Most glass is, plastic only if rated, and stainless steel never. Always vent the lid, and when unsure use a glass dish or plate.
Can you microwave plastic containers?
Only plastic labelled microwave-safe, with the lid vented. Other plastics can warp or degrade, so transfer food to glass if unsure.
Why should you vent the lid when microwaving?
Trapped steam builds pressure, which can pop the lid or crack the container. Removing or venting the lid lets steam escape safely.
Bottom Line
Only microwave containers labelled microwave-safe, with the lid vented. Most glass is safe, plastic only if rated, and stainless steel never. When in doubt, use a microwave-safe glass dish or plate. See our best food storage containers guide.
