Can plastic lunch boxes be heated in the microwave?
If the plastic lunch box is made of polypropylene (PP) or polyethylene (PE), it can be heated in a microwave oven. However, long-term high-temperature heating should be avoided. Each plastic has its heat resistance limit. Among the materials for food use, polypropylene (PP) can withstand 140°C, followed by polyethylene (PE), which can withstand 110°C, while…