Double walled glasses are widely used recently.
There many different kinds and shapes of doubled glasses, such as double wall tumblers, mugs, jugs, bottles, stemware, pot, colors items...
1. What’s the function of double wall glasses?
The double walled glass cup adopts the principle of double-layer structure, which enhances the comfort of the cup, and also improves the heat preservation function of the glass. In addition to the humanized design, the double-layer glass has good aesthetic value. Transparent The material is combined with a two-layer structure, which almost sublimates drinking tea into a dynamic artistic behavior.
Many glass manufacturers produce double-layer ice buckets. The vacuum double-layer cups are usually hand-blown. The double-layer glass has the function of heat preservation and heat insulation, and can also store ice cubes. During the blowing process, if the middle layer is not vacuum, the outer layer of the cup has an venting hole. This is to get the gas out of the cup, to prevent the cup from being deformed and exploding. After the production is completed, the hole is sealed. So there is gas in the middle of the two layers
2. The advantages of double walled glasses
1) It is not easy to absorb other tastes.
In the process of making double-layer glass water cups, due to the special fineness of the materials, the adsorption capacity of other tastes is not strong. You can't smell the smell of previous thick tea when drinking light tea, even if you just drunk the thick tea.
2) Durable
In the process of making double-layer glass water cups, due to the high hardness of the material, the double-layered water cups are specially made to resist friction. For those who have dishwashers in the house, the dishwasher can also clean directly. 
3) Good high borosilicate material
Double-layer glass cups are more sturdy than those of ordinary glass cups. The materials used in double-layer glass cups are more sturdy, cups are not easy to hang water during use, and they are easily to clean.
4) Not easy to crack
Double-layer glass is more technically demanding than double-layer glass. Due to the higher process requirements, double-layer glass is not easy to crack as a single-layer glass.
5) Unique appearance - high-end, Elegant
In the process of making double walled glass cups, there is a layer of glass inside, and a layer on the outside, so it looks better than single-layer glass from the appearance, and the aesthetic value is wider than single-layer glass.
6) Heat or Cold Resistant
They are made of high borosilicate glass, suitable temperature from -20°C~150°C.
If you want to buy a glass cup for yourself, it is recommended to buy a double glass cup. If there is boiling water inside the cup, double-layer glass cup will not be hot, if water. But the single-layer cup is easy to burn, if the temperature is too high.
The design of the double-layer glass greatly reduces the thermal conductivity of the cup body, and can effectively play the role of heat insulation and anti-scaling when used. Insulated cup keeps cold drinks cold and hot drinks hot, while the outside surface always feels comfortable in your hand.
7) Food Safe
Double wall glass is food-grade standard, it can hold hot water, tea, carbonic acid, fruit acid and other beverages, anti-acid corrosion.
Suitable for drinking tea: green tea, black tea, Pu'er tea, flower tea, scented tea, fruit tea, etc., the soup color is panoramic. All of this will highly improve the quality of life.
8) Impress your guests
It’s really a great try to get wonderful Double walled glasses to entertain your guests at parties, weekend getaways and the holidays. Or just use at home for an evening of ambiance.
