At present, the common rice cooker materials on the market mainly include aluminum liner, stainless steel liner and ceramic (purple sand) liner.
1, aluminum lining
Aluminum is easy to form, has excellent thermal conductivity and is very uniform, and can also be compounded with other metals or alloys. Rice cookers often use aluminum liners. However, because aluminum material will produce unhealthy aluminum if it comes into direct contact with food, it generally needs surface protection and coating.
2, stainless steel liner
Stainless steel liner generally adopts 304 plate, which has very good corrosion resistance and intergranular corrosion resistance. Its hardness and chemical stability are better than those of aluminum liner.
3, ceramic (purple sand) liner
Ceramic (purple sand) liner is a traditional material in China and a safe inorganic material. The inner container made of purple sand is rich in natural trace elements such as iron, zinc and calcium, which are beneficial to human health. The cooked food has good taste, excellent alkali resistance and strong corrosiveness, but its disadvantages are slow heat conduction and long heating time.
Among the above three materials, from the health point of view, the healthy rice cooker liner is a ceramic (purple sand) liner.