The general consensus seems to be that all Tupperware containers are microwave safe and can be used without any worry. Tupperware products are made with plastics, however all Tupperware products are not microwave safe.

Is it safe to reheat food in Tupperware?

You can use the Tupperware microwave containers to heat and reheat food safely. Furthermore, they can maintain the texture, taste and quality of your leftover. Though Tupperware microwave containers come with a limited lifetime warranty, you must use the containers the way they are meant to be used.

Can you microwave plastic containers?

Never heat or store food in plastic containers that were not intended for food. Single-use containers, like margarine tubs, tend to warp or melt in the microwave. This may allow more of the substances in the plastic to leach into the food.