Stainless steel is a metal; placing it in a microwave causes it to reflect electromagnetic waves and generate an electric arc (sparking), which could damage the appliance or even start a fire.
Avoid holding corrosive substances: Do not store strong acids (such as vinegar or lemon juice), strong alkalis, highly salted pickled foods, or traditional Chinese medicines in them for extended periods. Electrolytes and acidic components can damage the surface passivation layer, causing heavy metals like chromium and nickel to leach out. It is recommended to limit contact with acidic foods to under two hours, after which the food should be promptly cleaned out or transferred to another container.
No, you should absolutely not put stainless steel containers in the microwave.
Risk of sparking: Metal reflects microwaves and generates electrical sparks, which can damage the microwave or even start a fire.
Ineffective heating: Microwaves cannot penetrate metal, resulting in uneven heating or food that remains cold.
What to use instead: The safest choice is to use ceramic or glass bowls labeled "microwave-safe."
