A rice cooker cannot be used if the inner coating of the rice cooker falls off, because the inner coating of the rice cooker is mostly made of Teflon, a fluorine-containing polymer. This material is easily corroded by acidic substances such as rice and meat. Once corroded, the coating will fall off. This coating cannot be decomposed if eaten into the body and is harmful to the human body.

This kind of coating cannot be broken down if eaten into the body, and it is not easy to be excreted. If it remains in the body for a long time, it may even cause cancer. The national usage standard for rice cookers is 5 years, because the power cord, computer motherboard, magnets and other accessories inside the rice cooker are prone to aging if exposed to high temperatures for a long time, and are prone to short circuits and other accidents. It is recommended to use 5 or 6 years if possible. Change it every year.

The coating on the inner pot of the rice cooker is resistant to high temperatures and low temperatures. The high temperature can reach 180~260 degrees Celsius and the low temperature can reach -200 degrees Celsius. When the rice cooker is cooking rice, the temperature at the bottom of the inner pot will not exceed 130 degrees Celsius, usually between 110 degrees Celsius and 120 degrees Celsius. If it is cooking porridge, the temperature will be even lower, about 100 degrees Celsius.