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Common items: Most microwave oven lunch boxes are made of this material.
Misuse: The microwave oven lunch box, as it is called, can be used for microwave heating; Therefore, many people put the food into the microwave oven lunch box, cover it, and heat the whole thing in the microwave oven.
Hazard: There are some microwave oven lunch boxes, the box body is made of No. 5 PP (polypropylene), but the box cover is made of No. 1 PE. As PE cannot withstand high temperature, it cannot be put into the microwave oven together with the box.
Suggestion: It is a plastic box that can be put into the microwave oven and can be reused after careful cleaning. But to be on the safe side, remove the lid before you put the container into the microwave oven.
Disposable lunch box made of polystyrene material: refers to a colorless and transparent lunch box made of polymer synthesized by free radical addition polymerization of styrene monomer.
Other common items: mainly used for making bowl packed instant noodles boxes and foaming fast food boxes.
Misuse: I was too lazy to cook noodles in a pot, so I filled the whole bowl of instant noodles with cold water and directly put them into the microwave oven for heating. There are also dishes packed in disposable lunch boxes from restaurants, which are taken out of the refrigerator and directly put into the microwave oven for a turn.
Hazards: Plastic products are heat resistant and cold resistant. The thermal deformation temperature is 70. If the temperature is too high, chemical substances may be precipitated.
Suggestion: Never put boiled water, or use the microwave oven to cook instant noodles, and try to avoid using fast food boxes to pack hot food. It is more healthy to cover the lid of hot water that cannot be filled for a long time to prevent the toxic substances dissolved in hot steam from flowing back into the cup.