Tips For Purchasing Thermos Thermos Vacuum Flask

Take a look at the appearance of the cup. First, check whether the surface of the inner and outer tank is uniformly polished, whether there are bruises and scratches. Second, check whether the mouth welding is smooth and consistent. This is related to whether the feeling of drinking water is comfortable or not.Third, the quality of the plastic parts is poor. It will not only affect the service life, but also affect the sanitation of drinking water; Fourthly, see if the internal seal is tight. Whether the screw plug and the cup body fit properly. Whether it is easy to rotate in and out, and whether it is leaking. Fill a glass of water upside down for four or five minutes or shake it vigorously to verify that there is no leak. Look at the thermal insulation performance, this is the main technical index of the thermos vacuum flask. Generally, it is impossible to check according to the standard when purchasing, but you can check it by hand after filling it with hot water. The lower part of the cup body will heat up two minutes after the non-insulated cup is filled with hot water, while the lower part of the insulated cup is always cool.