Drinking water in a glass is healthier
[China Glass Net] The water cup is a daily necessities, but the variety is really too much. As far as the cup material is concerned, there are glasses, enamel cups, ceramic cups, plastic cups, stainless steel cups, paper cups, and the like. So how do you choose a safe drinking cup for drinking? To this end, the reporter interviewed Dong Jinshi, secretary general of the International Food Packaging Association, an expert in this field.
Glass: the preferred cup for drinking
The preferred cup for drinking should be a glass, especially for office and home users. The glass is not only transparent, but in all the cups, the glass is healthier and safer. The glass is made of inorganic silicates and contains no organic chemicals during the firing process. When people drink glass or other drinks, don't worry about chemicals being drunk. And the glass surface is smooth, easy to clean, bacteria and dirt are not easy to be born in the cup wall, so people drink water in a glass is healthier and safer.
It should be noted that the glass is more afraid of thermal expansion and contraction, and the glass with too low temperature (such as just taking it out of the refrigerator and just coming in from the cold outside), do not immediately put in hot water to prevent it from bursting.
Enamel cup: should be decisively eliminated after damage
The enamel cup is also a good choice. Enamel is a composite material in which an inorganic glass material is solidified on a metal by a thousand degrees of sintering. The enamel coating on the metal surface prevents rust, so that the metal does not form an oxide layer on the surface when heated, and is resistant to various liquids. Enamel products are free of lead and other harmful substances, easy to carry and clean, and are widely used as eating utensils and washing utensils used in daily life.
However, the enamel cup has a drawback, the enamel cup is afraid of bumping, and the surface is prone to breakage. Studies have shown that damaged enamel cups are prone to release harmful substances when they are used for drinks, and should be eliminated decisively.
Ceramic Cup: Don't choose colorful
The colorful ceramic cups are very flattering, but in fact there are huge hidden dangers in those bright colors. The inner wall of the colored ceramic cup is usually coated with a layer of glaze. When the glazed cup is filled with boiling water or an acid or alkaline beverage, some aluminum and other heavy metal toxic elements in the glaze are easily precipitated into the liquid. When people drink liquids with chemicals, the human body is hurt. Excessive levels of aluminum will cause an increase in the incidence of dementia, and other heavy metals may exceed the standard, which can lead to serious diseases. Therefore, it is better to use a ceramic cup, and do not use a cup coated with colorful glaze. If you can't resist the temptation of color, you can reach out and touch the color surface. If the surface is smooth, it means that it is underglaze or glaze, which is relatively safe. If the bump is uneven, it will fall off with the nail file. Glaze color, better not to buy.
Plastic cup: choose food grade plastic
In recent years, plastic cups have been loved by many people because of their varied shapes, bright colors, and fear of being beaten. They are very suitable for outdoor users and office workers, but the problem of plastic cups is very common. In fact, plastics are polymer chemical materials. When plastic cups are filled with hot water or boiling water, the polymer is easily precipitated and dissolved in water, which is harmful to human health after drinking. Moreover, the internal microstructure of the plastic has a lot of pores, which hide the dirt, and the cleaning will not kill the bacteria. Therefore, the choice of plastic cups is very important for the choice of plastic materials, we must choose food grade plastics in line with national standards.
Generally speaking, the bottom of the cup of the plastic cup has a mark, which is the number on the small triangle. The common one is “05â€, which means that the material of the cup is PP (polypropylene). PP cup has good heat resistance, melting point of 170 ° C ~ 172 ° C, chemical properties are also stable, in addition to being able to be attacked by concentrated sulfuric acid, concentrated nitric acid, and other chemical agents are relatively stable.
For the selection of plastic cups, Dong Jinshi, executive vice president and secretary general of the International Food Packaging Association, suggested "seeing two things and three hands":
Go back and look at the color. Good plastic cups have a shiny appearance, and the inferior appearance is somewhat dark.
Second, open the lid and smell it. If there is any odor, it indicates that the cup material is not up to standard.
Third, pinch the cup by hand. Good plastic cups are thick and have good hardness. The pressure is not excessively deformed by hand.
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