When you buy a vacuum flask, you can use the following identification methods:

The first thing to look at is the appearance of the cup. First, check whether the inner and outer bladder surfaces are 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 a few vigorously to verify the 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.

There are several specific methods as follows:

1. Simple identification method for vacuum insulation cup performance: Pour boiling water into the insulation cup and tighten the cork or lid clockwise for 2-3 minutes and then touch the outer surface of the cup body with your hand. If the cup body is obviously warm, it means The product has lost its vacuum and cannot achieve a good insulation effect.

2. Sealing performance identification method: After adding water to the cup, tighten the stopper and lid in a clockwise direction, place the cup flat on the table, and there should be no water leakage; the screwing of the lid and the cup should be flexible and there is no gap .

3. Plastic parts identification method: new food-grade plastics are characterized by low odor, bright surface, no burrs, long service life and not easy to age. Ordinary plastics or recycled plastics are characterized by big smell, dark color, many burrs, and plastics are easy to age and break.

4. Simple capacity identification method: The depth of the inner tank is basically the same as the height of the outer shell, and the capacity (with a difference of 16-18MM) is consistent with the nominal value. Some low-quality vacuum flasks add sand and cement blocks to the cup to make up for the missing weight. Myth: A heavier cup (pot) is not necessarily good.

5. Simple identification method for stainless steel materials: There are many specifications of stainless steel materials, of which 18/8 means that the composition of this stainless steel material contains 18% chromium and 8% nickel. The material that meets this standard is a green product that meets the national food-grade standard. Anti-rust and corrosion resistance. The color of the ordinary stainless steel vacuum flask is whitish and dark. If it is soaked in 1% salt water for 24 hours, it will produce rust spots. Some of the elements contained in it exceed the standard and directly endanger human health.