What is the maximum temperature of the bathroom mirror for fog prevention?

Anti-fog mirror, there is a heating wire behind it, so that water will not condense on the mirror.

Anti-fog mirror is a special mirror for bathroom, also called anti-fog mirror. By heating the mirror, the fog attached to the mirror during bathing can be quickly removed, which is convenient for use during bathing. There are two heating methods for anti-fog mirror: covering the back of the mirror with electric heating wire or electric heating film, which is safe, durable, energy-saving and machinable. When in use, plug in the power supply and heat the mirror through the electrothermal film, so that the temperature of the mirror rises, the fog attached to the surface is easy to volatilize, and the mirror can always be clear and bright. Explain the principle? Usually, our mirror fogs because the hot water vapor in the bath touches the surface of the mirror and condenses into small water droplets when it is cold and exothermic. If the surface temperature of the mirror is relatively high, this phenomenon will naturally decrease.