1. Commercially available plastic lunch boxes for microwave ovens are mainly made of polypropylene or polystyrene. If the temperature exceeds their heat resistance limit, the plasticizer may be released, so it should be Avoid using high-temperature plastic lunch boxes to reheat food for a long time;

2. Fast food lunch boxes should not be heated in the microwave;

3. Glass lunch boxes, aluminum pots, enamel pots and Metal lunch boxes such as stainless steel pots cannot be placed in the microwave;

4. Wooden lunch boxes with painted surfaces cannot be placed in the microwave.