Contact with water. However, the silica gel at the bottom of the thermostatic kettle is waterproof and mainly plays a sealing role. As far as the silica gel used in the health pot is concerned, it is mostly food grade, of course, the premise is the products produced by regular businesses. The silica gel at the bottom of this kind of health pot is non-toxic and resistant to high temperature, so even if it is heated, it will not produce toxic substances and will not cause harm to the user's body.