Can stainless steel lunch boxes be heated in a microwave oven?

Stainless steel lunch boxes cannot be heated in a microwave oven. This is because stainless steel, as a metal material, may produce sparks when heated in a microwave oven, causing damage to the inner wall of the microwave oven and even damaging the magnetron of the microwave oven. In addition, stainless steel also reflects microwaves and cannot effectively heat food.

When heating in a microwave oven, be sure to use containers suitable for microwave heating, such as glass lunch boxes, PBT plastic materials, Lock and Lock and environmentally friendly material lunch boxes. Also note that closed containers cannot be used for heating as this may cause an explosion. Keep the container open while heating, or use a microwave-safe container.

In general, if you are not sure whether a certain container is suitable for microwave heating, it is best not to risk using it to avoid causing damage to the microwave oven and the container.