Whether or not to cover the lunch box with the lid when heating it in the microwave oven depends on the situation. If the lid is not covered, heating will cause the food moisture to reduce and dry out. If it does not affect the taste, there is no need to cover it. If it dries out and becomes unpalatable, then a lid is needed, but the lid cannot be sealed too tightly and needs to be breathable, otherwise the steam will push the lid up in the microwave, which will probably startle the juicy rice and cause it to collapse. It's everywhere.

Only plastic boxes marked "No. 5" or PP are suitable for microwave ovens and can be placed in microwave ovens. Do not put plastics without markings in microwave ovens. Even if the box is specially designed for microwave ovens, it must be To remove the cover.

Microwave-safe plastic box that can be reused after careful cleaning. However, special attention must be paid to the fact that the box body of some microwave lunch boxes is indeed made of No. 5 PP, but the lid is made of No. 1 PE. Since PE cannot withstand high temperatures, it cannot be put into the microwave oven together with the box body. For safety reasons, remove the lid from the container before placing it in the microwave.

Extended information

Generally common lunch boxes are: glass silicon, plastic, and iron. Plastic is divided into PC material and PP material, so it can also be said that there are 4 types. Among them, glass lunch boxes are the safest in terms of material, but they are inconvenient to carry and need to be carefully protected. They are also heavy. Even if you don’t put anything in them, the weight is already there. For plastic, it is recommended to buy PP5. PP material is an international safety grade material, while pp5 is high temperature resistant and can be put into the microwave oven. Therefore, it is recommended to buy a pp5 lunch box, which is also easier to carry. Those made of iron are prone to heat and will burn your hands.

Plastic lunch boxes are plastic containers made of food-grade plastic materials used to facilitate our take-out food. It is a very common household plastic product in our daily life and is an indispensable plastic container for picnics or hiking. Plastic lunch boxes are also available in a variety of styles and sizes. Square plastic lunch boxes can be used to store various ingredients. Rectangular plastic lunch boxes are easy to store moisture-rich foods such as fruits, vegetables and seafood. Round plastic lunch boxes are suitable for storing sauces, sauces and various side dishes.

Baidu Encyclopedia-Lunch box (container for food)