1, glass
Glass cups are generally made of inorganic silicate substances at a high temperature of more than 600 degrees or even thousands of degrees. The chemical composition of inorganic silicate is relatively stable and will not release or produce harmful substances during firing.
2. Non-glazed ceramic cups
The main component of ceramic cups is clay, which will form a layer of glaze on the surface after high temperature calcination. In general, this glaze is free of harmful substances. Drinking hot water, pouring boiled water and drinking tea are all very good choices.
3. Stainless steel cups
Stainless steel cups are widely used because they are not fragile and easy to clean. However, stainless steel belongs to alloy products and contains many kinds of heavy metals. If used improperly, it will release toxic and harmful substances and endanger health.
4. Enamel Cup
This is an appliance with a metal skeleton and porcelain glaze. It takes into account the advantages of metal utensils and porcelain, which can not only prevent iron metals from rusting, but also prevent porcelain from being easily broken. So it was very popular and widely used in the last century.
5. Paper cups
Disposable paper cups are widely used because of their convenience. This paper cup has a layer of paper outside and a film inside. Whether this kind of paper cup is clean or not is unrecognizable to the naked eye.