Not all lunch boxes can be heated in the microwave oven. You can see that there are corresponding numbers at the bottom or inside the box cover. If it is No.5, it has better heat resistance and is made of PP polyethylene, which is more suitable for microwave heating.

Most plastic appliances that can be heated by microwave oven are made of No.5 PP, and if they are No.3 or No.6, they cannot be heated by microwave oven. Generally speaking, plastic lunch boxes for packaging are safe.

How to use the microwave lunch box?

1, put the plastic lunch box in the microwave oven for heating. Pay attention to adjust the heating time, not too long, otherwise it may be deformed. Suggest 2-3 minutes.

Pay more attention to the food in the lunch box. Try not to choose green leafy vegetables or cold salads, because they contain nitrates, which will be harmful to human health after a long time, and the nutrients will be easily lost after heating.

3. When the meal is ready, put it in a lunch box and heat it in the microwave the next day. Try not to choose steamed bread and cakes as the staple food, otherwise it will dry.

4. Foods with high oil content should not be put into the microwave oven, because even if they are boxed, oil droplets are easy to splash at high temperature, which is easy to damage the furnace cavity.

It's better to store the food in the lunch box separately. For example, staple food, side dishes and fruits should be placed in separate compartments.

6, lunch boxes should be replaced regularly, because often heated, internal molecules will change, if used continuously, may release harmful substances.