1. Pay attention to the material of the product label. Currently, polyethylene film is widely used in food packaging; polypropylene film can be used for packaging bread, snacks, etc. due to its transparency; vinyl chloride film is used for perishable vegetables, fruits, etc. Packaging for food, but not for greasy foods or heating in microwave ovens.
2. When heating food in a microwave oven, use packaging containers with the label "for microwave ovens". Refrigerated and frozen foods in the refrigerator should use food composite packaging films and cannot be replaced by ordinary plastic bags.