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Drink cups preferred glass to buy the need to understand the merits of various types of cups

Water cup is the most common daily necessities, but the type is too much. On the cup material, the common glass, enamel cup, ceramic cup, plastic cup, stainless steel cup, paper cups and so on. So, how to buy a safe cup for drinking?
Glass: the first choice for drinking cups
The preferred cup should be a glass, especially the office and home users. Glass is not just a good-looking, but in all the cups of the material, the glass is the most healthy and safe. Glass is made from inorganic silicates and does not contain organic chemicals during the firing process. When people drink water or other drinks with glass, do not worry about chemical substances that will be drunk ; And the glass surface is smooth, easy to clean, bacteria and dirt is not easy in the cup wall breeding, so people use the glass to drink water is the most healthy and safest.
The only thing to note is that the glass is most afraid of thermal expansion and contraction, the temperature is too low glass (such as just from the refrigerator out, just from the cold out of the room), do not immediately into the hot water to prevent the explosion.
Plastic cup: choose food grade plastic
In recent years, the plastic cup because of its changing shape, bright colors, not afraid of beating characteristics, by many people love, very suitable for outdoor users and office workers to use, but the plastic cup problem is very common. In fact, the plastic is a polymer chemical materials, plastic cups with hot water or boiling water, the polymer is easy to precipitate dissolved in water, after drinking on human health harmful. And the internal microstructure of plastic has a lot of pores, which hide the dirt, cleaning is not clean will breed bacteria. So the choice of plastic cup for the choice of plastic material is very important, we must choose in line with national standards of food grade plastic.
In general, the bottom of the plastic cup has a logo, that is, the number on the small triangle, the common is "05", on behalf of the cup material is PP (polypropylene). PP material of the cup has a good heat resistance, the melting point of 170 ℃ ~ 172 ℃, the chemical properties are more stable, in addition to being concentrated sulfuric acid, concentrated nitric acid erosion, the other various chemical reagents are relatively stable.

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