Different foods are kept for different times. Don’t rely solely on the sealing ability of plastic lunch boxes. You should eat them as soon as possible. The P.P (polypropylene) plastic lunch box can be heated for a short time when used in a microwave oven, but it cannot be used as a cooking container used in a microwave oven. (When heating and thawing for a short time, the time should not exceed 3 minutes.)
When putting it into the microwave oven, you must loosen the lid joint device before using it. If the lid is locked and used, the plastic lunch box may deform or burst due to pressure. When used in a microwave oven, if the food contains more oil and sugar, the plastic lunch box will be deformed if the temperature rises rapidly.