The crystal glass should only be used at 80 degrees Celsius because the water temperature is too high, which can cause the crystal glass to crack or even explode. Crystal cup material is hot may explode, crystal cup heat conduction is better than the glass, with boiling water and relatively low room temperature is easy to explode, that is, from the mechanics of the thermal stress. Crystal cup is generally filled with cold drinks, more than 80 degrees of drink is not suitable for the crystal cup as a container. Crystal cup is a drinkable cup or wine glass made of lead-free crystal glass. With the popularity of technology and technology, crystal glass has been used as a tea cup, which has become the favorite of fashionable people in the new era. The other is the common crystal wine glass. Lead-free crystal is popular with consumers and manufacturers because of its transparency and brightness. Crystal cups are generally used for wine tasting. Crystal cups have good light transmittance, and the glasses made of this material have good light refraction effect, which makes them look very pleasant to the eye when tasting wine. And the hardness of the crystal cup is high, the strength of the cup is enough, the cup wall can be made very thin, the whole cup is very light, both men and women can be relaxed and elegant when tasting wine drink. Clinking glasses is a common custom of wine tasting, and the sound of crystal glasses is louder and clearer than that of glasses. Crystal glasses are different from ordinary glasses in that the walls of the glass are made up of many small facets, which make it easier to retain the aroma of the wine in the glass.