What cup is the healthiest for drinking water?

Materials such as glass, ceramics and enamel are safe and common in China. 1. The most common thing is glass, especially in the office and at home. The cup is not only transparent and beautiful, but also the healthiest and safest of all cups. This kind of glass is made of inorganic silicate and contains no organic chemicals during firing. When drinking water or other drinks from a glass, you don't have to worry about chemicals being drunk into your stomach. The glass surface is smooth and easy to clean, and bacteria and dirt are not easy to breed on the glass wall. However, it should be noted that the glass is most afraid of thermal expansion and cold contraction, and the glass with too low temperature should not be filled with hot water immediately to prevent it from bursting.

2. Plastic cups. Because of its changeable shape, bright color and resistance to flapping, it is loved by many people, especially outdoor sports enthusiasts and office workers. Generally, there is a sign on the bottom of a plastic cup, which is the number on a small triangle. The most common one is "05", which means that the material of the cup is PP (polypropylene). The cup made of PP has good heat resistance and stable chemical properties, and is stable to other chemical reagents except concentrated sulfuric acid and concentrated nitric acid. Plastics belong to polymer chemical materials. When hot water or boiled water is filled in plastic cups, the polymer will easily precipitate and dissolve in water. Be sure to choose food-grade plastics that meet national standards.

3. Ceramic cups. It is best to choose a primary color cup. If you really want to buy a colored cup, reach out and touch the colored surface. If the surface is smooth, it means underglaze color or underglaze color, which is relatively safe. If it is uneven, it will fall off with nails, which means it is glazed. It is best not to buy it.

4. Stainless steel cup. Its advantages are durability, rust prevention and corrosion prevention. However, stainless steel cups are alloy products and contain a lot of heavy metals. If used improperly, these heavy metals can be released easily, which is harmful to health. Therefore, in daily use, be careful not to use stainless steel cups to hold acidic drinks, such as coffee and carbonated drinks. No soy sauce, vinegar, tea, etc. For a long time, the electrolyte in these foods may react with the heavy metals in stainless steel, leading to the precipitation of heavy metals.

5. Enamel cups. Enamel cups are also a good choice. Enamel is a kind of composite material in which inorganic glass material is melted and solidified on metal by thousands of degrees. The enamel coating on the metal surface can prevent rust, so that when the metal is heated, it will not form an oxide layer on the surface, and it can resist the corrosion of various liquids. Enamel products do not contain harmful substances such as lead and are easy to carry and clean. They are widely used as tableware and washing utensils in daily life. Enamel cups have one disadvantage. Enamel cups are afraid of bumping and the surface is easy to be damaged. The research shows that damaged enamel cups are easy to precipitate harmful substances when holding drinks, so they should be eliminated decisively.