Most plastic boxes of Japanese bento can be heated by microwave oven, but the following points should be noted:

Choose plastics suitable for microwave ovens: Some low-quality plastics will be deformed or release harmful substances due to the high temperature generated by microwave ovens. Therefore, when using Japanese bento plastic boxes, we should choose plastic products suitable for microwave ovens, such as PP, PE and other materials.

Marking on the plastic box: Generally, if the plastic box is suitable for heating in the microwave oven, it will be marked with "microwave oven safety" (microwave oven only) or a microwave icon will be displayed.

Don't seal: When heating food, open the lid and don't seal it completely, so as not to cause the box to be deformed or broken due to pressure accumulation.

Heating time and temperature: The heating time and temperature should be controlled within a proper range to avoid plastic deformation or damage caused by excessive heating.