Here is a little tip for you.
Microwave safe plastic symbol.
Never put metal paper bags styrofoam or plastic containers without the microwave safe symbol into the microwave.
So you can safely reheat or defrost food in it in a microwave oven.
When using the microwave it is best to remove the container lid and then heat according to the power indicated see temperature symbol.
The easiest way to figure out if a plastic container is safe for the microwave is to look for the microwave safe symbol.
So regardless of the type of plastic high temperatures will cause chemicals to leach into.
Type 5 polypropylene is most often labeled microwave safe this plastic is sturdy and heat resilient and it stays clear even when exposed to tomato sauce.
All plastics are derived from petroleum however.
Check for a symbol that looks like a mini microwave with wavy lines on the door to know that your container or cookware is microwave safe.
This symbol indicates that the product is designed to be used in the microwave.
Squiggly lines mean you can reheat that sucker with ease.
Squiggly lines indicate that your container is microwave safe.
This symbol can vary a lot sometimes showing an image of a microwave or sometimes a dish set below radiation waves but the squiggly lines are a constant.