The stainless steel vacuum flask is a vessel used to hold water. If its quality is not good, people will cause harm to the human body if it is consumed. At present, there are many stainless steel vacuum flasks on the market. Then, when we want to buy stainless steel vacuum flasks in the market What should I pay attention to? Below, the editor will tell you the precautions for purchasing stainless steel vacuum flasks, hoping to help you.
1. First look at the label or manual of the cup
Generally, regular manufacturers will write the product model number, name, volume, material, production address, manufacturer, standard number, after-sales service, usage method, and so on. If none of these are present, then there is a problem.
2. Identify from the appearance of the thermos cup
Firstly, check whether the inner and outer surfaces are uniformly polished, whether there are bruises, scratches or burrs; secondly, whether the mouth welding is smooth and consistent, which is related to whether you feel comfortable when drinking water; thirdly, whether the internal seal is tight, Whether the screw plug matches the cup body; look at the cup mouth, the more round the better, the immature craftsmanship will appear out of round.
3. Tightness testing
First twist off the lid to see if the lid fits perfectly with the cup body, then add boiling water (preferably boiled water) to the cup, and then invert the cup for two to three minutes to see if any water seeps out.
4. Thermal insulation test
Because the stainless steel vacuum flask adopts vacuum heat insulation technology, because it can prevent heat from being transferred to the outside under vacuum, so as to achieve the effect of heat preservation. Therefore, to check the heat preservation effect of the stainless steel vacuum flask, you only need to put boiling water into the cup, and after two or three minutes, touch each part of the cup with your hand to see if it is hot. If any part is hot, the temperature will be lost from that place. . It is normal that there will be slight heat in the place like the mouth of the cup.
5. Identification of other plastic parts
The plastic used in the thermos cup should be food grade. This kind of plastic has a small odor, a bright surface, no burrs, a long service life and is not easy to age. Ordinary plastics or recycled plastics are characterized by big smell, dark color, many burrs, easy aging and breakage of plastics, and smelly after a long period of time. This will not only shorten the life of the vacuum flask, but also threaten our physical health.
6. Capacity detection
Because the thermos cups are double-layered, the actual capacity of the thermos cups will be different from what we have seen. First look at whether the depth of the inner layer and the height of the outer layer of the thermos cup are not much different (generally 18-22mm). In order to reduce costs, many small factories often start with materials, which may affect the capacity of the cup.
7. Recognition of the stainless steel material of the vacuum flask
There are many types of stainless steel materials. 18/8 means that this stainless steel material contains 18% chromium and 8% nickel. Materials that meet this standard are environmentally friendly products that meet the national food-grade standards and are anti-rust and corrosion-resistant. Ordinary stainless steel cups (pots) are whitish or dark in color. If they are immersed in 1% salt water for 24 hours, rust spots will occur. Some of the elements contained in them exceed the standard and directly endanger human health.
The above is the precautions for purchasing stainless steel vacuum flask that the editor tells you. Do you all know?
