Don't heat the iron lunch box in the microwave oven. It must be noted that heat-resistant containers such as metal tableware, bamboo utensils, plastics and lacquerware should not be heated in the microwave oven. In addition, glass products with concave and convex shapes and porcelain dishes with honeysuckle edges should not be put into the microwave oven. Food containers must be special containers for microwave ovens. Can't be put directly into the microwave oven cavity. It should be placed in the specified location.