Plastic wrap can be heated in microwave oven. Choose plastic wrap suitable for microwave heating. There are some plastic wrap films specially used for microwave heating in the market, and they are usually marked with the words "for microwave oven only". These plastic wrap films have been specially treated, so they can be heated in the microwave oven without producing harmful substances. Pay attention to avoid overheating when using plastic wrap. When the microwave oven is heated, the food will produce steam. If the plastic wrap is sealed too well and the steam cannot be released, it will lead to the explosion of the plastic wrap. Therefore, when using plastic wrap to heat food, some small holes should be left on the plastic wrap for steam release. The heating time should be properly controlled. Because the food heated by microwave oven will generate heat, the plastic wrap will also be heated. If the heating time is too long, the plastic wrap will deform or melt, and even cause a fire. Therefore, when using plastic wrap to heat food, the heating time should be controlled according to the type and quantity of food to avoid prolonged heating. Plastic wrap is a kind of plastic packaging product, which is usually made by polymerization with ethylene as the masterbatch. Plastic wrap can be divided into three categories: the first is polyethylene, abbreviated as PE; The second is polyvinyl chloride, referred to as PVC；; The third type is polyvinylidene chloride, or PVDC for short. Microwave food heating, refrigerator food preservation, fresh and cooked food packaging and other occasions are widely used in family life, supermarkets, hotels and restaurants and industrial food packaging.