There are many types of stainless steel vacuum flasks on the market, and the price difference is also very large. For some consumers, they do not understand the principle and often spend a lot of money to buy satisfactory products. How can I buy a high-quality vacuum flask?

First look at the appearance of the cup.

Look at whether the polishing of the inner and outer gallbladder surfaces is even and consistent, and whether there are bruises and scratches

Second, look at whether the mouth welding is smooth and consistent, which is related to whether you feel comfortable when drinking water together;

Three look at the poor quality of plastic parts. Not only will it affect the service life, but also the drinking water hygiene;

Fourth to see if the internal seal is tight. Whether the screw plug and cup body fit properly. Whether the screw-in and screw-out are free and leaking. Fill a glass of water upside down for four or five minutes or shake it a few times to verify the leak. Looking at the insulation performance, this is the main technical index of the insulation cup. In general, it is impossible to check according to the standard when purchasing, but you can check with your hand after filling with hot water. The uninsulated cup will heat up after two minutes of hot water, and the lower part of the insulated cup will always be cool.

There are several methods as follows:

1. Simple identification method for vacuum insulation performance: Pour boiling water into the insulation cup and tighten the stopper or cap clockwise 2-3 minutes, then touch the outer surface of the cup body with your hand if the cup body has obvious warming phenomenon , Indicating that the product has been lost The degree of vacuum can not achieve a good thermal insulation effect.

2. Sealing performance identification method: After adding water to the cup, tighten the stopper and the cap in a clockwise direction, and place the cup flat on the table, there should be no water leakage; the rotation of the cap and the cup mouth should be flexible , No gaps.

3. Plastic parts identification method: The characteristics of food-grade new plastics are low odor, bright surface, no burrs, long service life and not easy to age. The characteristics of ordinary plastics or recycled plastics are large odor, dark color, many burrs, and plastics are easy to age and break easily.

4. Simple capacity identification method: the depth of the liner is basically the same as the height of the shell, (the difference is 16-18MM) and the capacity is consistent with the nominal value. Some poor quality thermos cups add sand and cement blocks to make up for the missing weight. Myth: Heavier cups (pots) are not necessarily better.

5. Simple identification method for stainless steel materials: There are many specifications for stainless steel materials, of which 18/8 indicates that the composition of this stainless steel material contains 18% chromium and 8% nickel. The material that meets this standard meets the national food grade standard and is green Products, product rust, corrosion resistance. Ordinary stainless steel cups appear white and dark. If put in 1% brine for 24 hours, it will produce rust spots, and some of the elements contained in it exceed the standard, which directly endangers human health.