At present, there are many varieties of stainless steel vacuum flasks on the market, and the price difference is also great. For some consumers, they don't understand the principle and often spend a lot of money to buy the satisfactory products. How can I buy a high-quality vacuum flask?
When you buy stainless steel vacuum cups, you can use the following identification methods:
The first is to look, first of all, the appearance of the cup. First, check whether the surface of the inner and outer bladder is uniformly polished, whether there are bruises and scratches; second, whether the mouth welding is smooth and consistent, which is related to whether the feeling of drinking water is comfortable; 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 whether 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. Looking at the thermal insulation performance, this is the main technical indicator of the 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.