Safety index: five stars
Glass contains no organic chemicals, its surface is smooth and easy to clean, and bacteria are not easy to breed on the glass wall, so drinking water from glass is the healthiest and safest. However, glass has strong thermal conductivity and is easy to burst, so hot water with too high temperature should be avoided.
Colorless glaze is the first choice for ceramic cups.
Safety index: four stars
The unglazed ceramic cup is not only safe in material and resistant to high temperature, but also has relatively good heat insulation effect. However, colored glazed ceramic cups can easily lead to the dissolution of harmful metals such as lead and cadmium, which may cause chronic poisoning.
Don't use enamel cups to hold sour drinks.
Safety index: four stars
The enamel cup is glazed at a high temperature of 1000 degrees, and does not contain harmful substances such as lead. However, it is easy to wear when used for a long time, and the metal components will be soluble in water. In addition, the enamel cup is not suitable for making tea because of its fast heat dissipation and heat transfer, and the tea fragrance is easy to distribute.
The cleaning of stainless steel cups is particular.
Safety index: three stars
Stainless steel cups are made of Fe-Cr alloy and other trace elements, including carcinogenic heavy metal nickel. Improper use will endanger human health. Do not hold acidic drinks or strong alkaline foods for a long time, and do not use strong alkaline or strong oxidizing chemicals, such as soda and bleaching powder, to prevent metal elements from dissolving out.
Plastic cups should be filled with water at room temperature.
Safety index: two stars
When the plastic cup is filled with hot water, toxic chemicals can easily penetrate into the water. Therefore, it is not suitable for hot water, and it is not recommended to hold carbonated drinks and milk for a long time. Do not use it for more than half a year, and avoid ultraviolet radiation at ordinary times.
Disposable paper cups have many health risks.
Safety index: one star
Many disposable paper cups are added with fluorescent powder. When using disposable paper cups, it is best to scald them with boiling water first, and then pour out the water after four or five minutes, so that the toxic substances in the paper cups can be fully volatilized. In addition, supercooled and overheated water, alcohol or acidic drinks, etc. Not suitable for disposable paper cups.