Is Styrofoam Microwave Safe?

PS, polystyrene, Styrofoam, #7 is not safe for the microwave. Most take out containers and clamshells are made of foam for its insulation properties. They keep food warm during transport so you don't have to reheat them. Be sure to put your food on a plate or other safe container before zapping them in the microwave.

What happens when you microwave food in Styrofoam?

It is not safe to microwave this most-common type of Styrofoam. During normal use, the material remains stable. But at high temperatures, it begins to melt or break down. Even if there's no visible damage on the foam, a microwave oven may cause the toxic chemical styrene (among other chemicals) to leach into your food.

Is it OK to reheat food in Styrofoam?

Food-use styrofoam containers, made from expanded polystyrene, are not oven safe. These styrofoam containers will begin to soften at 212°F and actually melt at 464°. They are, however, safe to use for storing food in the refrigerator but never to cook or reheat in the oven.