Not all plastic disposable bowls are microwave safe, as the suitability of a plastic bowl for use in the microwave depends on the type of plastic used to make the bowl. Some plastics can melt, deform, or release harmful chemicals when exposed to high temperatures in the microwave.
To determine whether a plastic disposable bowl is microwave safe, you should check the packaging or look for symbols on the bottom of the bowl that indicate its suitability for use in the microwave. Look for the microwave-safe symbol, which is often a series of wavy lines or a square with the word "microwave" inside it.
If the bowl is not labeled as microwave safe, you should avoid using it in the microwave. Instead, transfer the food to a microwave-safe container, such as a glass or ceramic bowl, before heating it in the microwave. It is important to use caution when heating food in any container, as the contents can become very hot and cause burns or scalds. Always follow the manufacturer's instructions for heating food in the microwave and use oven mitts or a potholder to handle hot containers.