The design of double-layer glasses not only prevents scalding, but also has a certain insulation effect, which is one of the reasons why double-layer glasses are now widely used. So how to test the insulation effect of double-layer glasses?
Because the double-layer glass cup adopts vacuum insulation technology, it can prevent the transfer of heat to the outside world under vacuum, thereby achieving insulation effect. So to test the insulation effect, simply pour 100 degree boiling water into the cup. After two to three minutes, touch each part of the double glass glass by hand to see if it is hot. If any part heats up, the temperature will be lost from that place. However, it is normal for the mouth of a double-layer glass to have a slight fever.
Then the sealing of the double layer glass cup also affects its insulation effect, with good sealing and better natural insulation effect. To test its sealing, first twist off the cup lid to see if it fits perfectly with the cup body. Then add boiling water to the cup and invert it for two to three minutes to see if any water will seep out. If the glass does not leak, it indicates good sealing.
The insulation effect of a double-layer glass cup is very practical because it can ensure the temperature of the tea and not make it difficult to drink like an insulated cup.