If in doubt, call the fire department. Use only microwave-safe utensils. The instructions that come with each microwave oven specify what kinds of containers are safe to use and how to test the suitability of materials before use. Always use oven gloves to remove items from the microwave oven after cooking. Be careful when removing a wrapping or covering from a hot item.
Hot steam escaping from the container, as the covering is lifted, can cause painful burns.
Be careful when heating liquids in the microwave oven. Since the containers may only feel warm, rather than hot, they are sometimes handled less cautiously. This can easily result in the splashing or spilling of a scalding liquid. Before allowing children to operate a microwave oven, make sure that they are instructed in the proper use, and that they are tall enough to reach the oven and handle foods safely.