Here is a little tip for you.
Microwave safe plastic symbol.
So regardless of the type of plastic high temperatures will cause chemicals to leach into.
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.
So you can safely reheat or defrost food in it in a microwave oven.
Squiggly lines mean you can reheat that sucker with ease.
After being microwaved the plastic feels cool.
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.
Squiggly lines indicate that your container is microwave safe.
This stamp of approval which includes three wavy lines to symbolize.
The easiest way to figure out if a plastic container is safe for the microwave is to look for the microwave safe symbol.
This symbol indicates that the product is designed to be used in the microwave.
All plastics are derived from petroleum however.
When using the microwave it is best to remove the container lid and then heat according to the power indicated see temperature symbol.