Ceramics is 1320 degrees high temperature baked. Normal life is already not able to exceed this temperature, so it hold live heat, do use cups, can be insulated. Of course, some of the best selection of lightweight, porcelain ceramic cups better, how promising is poor, you can see its light transmission, put it in the window, looked up at the inside bottom of the cup bottom ring visible, the more evident, indicating good. This is an old method. After a lot of material to do the cup will produce some adverse temperature volatile substance, such as plastic. Soil is a natural, there is nothing that is good. Ceramic cup with a cultural value, ceramic = china, needless to say, this is the Chinese culture. Have friends from afar, I would like to use ceramic cups than plastic cups, glasses child to better reflect your taste. Of course, different for different people and beverage cups. Modern types of ceramic cup shape more and more, to meet your needs.