The physical properties of glass never cease to amaze us. Borosilicate glass was once used to make medical equipment. It is a very strong but light glass which has peculiar temperature exchange properties. Insulated glasses for home use are made of this glass; regular glasses are made of soda-lime glass. They are much heavier and fragile.
Insulated glasses are like normal glasses, they are transparent and they feel like glass too. The difference is that they have two layers of glass, the external one which you hold and the internal one which holds the liquid. In between them is a sealed layer of air that does the magic of keeping cold drinks cold and hot drink hot for a longer period of time than regular glasses.
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Polycarbonate is very strong and resistant to shock and temperature changes. Polycarbonate is a polymer plastic used to make Tervis insulated glasses. Glasses made out of polycarbonate will keep your colds, cold for a longer time than regular glasses. Their greatest feature is that they are transparent as glass and will remain so for a long time if treated with care.
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For many years keeping the temperature of your cold or hot drink longer was a problem people face especially when they were outdoors. It was also very uncomfortable to walk in the forest or on the sandy beaches with a glass in your hands without spilling its contents all over the place. Double insulation glasses came to solve these problems forever. They will keep your cold drinks cold and your hot drinks hot for a long time. The same glass can also be used for either purpose.
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Every time you have a party at home, be it large or small you have to spend most of your time coming and going to the kitchen for ice. This happens especially in hot summer night when the ice melts at amazing speeds, not only in the drinks but in the ice bucket too. Insulated tumbler glasses are the solution to your problem, and they are a permanent solution.
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