The vacuum flask is one of our usual daily necessities that we always need. The invention of vacuum flask has brought us a lot of convenience. It is precisely because of the practicality of vacuum flask that vacuum flask has entered our thousands of households. Because of the continuous innovation of the thermos, the thermos can not only keep heat but also keep the cold, which undoubtedly brings us more convenience, and it has the effect of keeping cold in summer, but when we are all chasing the thermos, is there any Ever wondered how to test this thermos cup when it was purchased? If you buy it unqualified, it will not be a big loss! Today, let’s listen to what the Thermos Cup professor gives us!

The first type: insulation test

Because the vacuum insulation cup uses vacuum heat insulation technology, because it can prevent heat transfer to the outside under vacuum, and then achieve the effect of heat preservation. Therefore, to test the insulation effect of the vacuum flask, you only need to pour 100 degrees of boiling water into the cup. After two or three minutes, touch each part of the vacuum flask with your hands to see if it is hot. If which part is hot, the temperature will be Throw it away from that place. It is normal that there is a slight heat in the area like the cup mouth.

The second type: leak test

First, twist off the lid of the cup to see if the lid fits the cup body completely, then add boiling water in the cup (boiled water is best), and then invert the cup for two to three minutes to see if there is any water seeping out.

The third type: identification of plastic parts

The plastic used in the vacuum flask is about food grade. This kind of plastic has a small odor, a bright surface, no burrs, and has a long service life and is not easy to age. The characteristics of general plastics or recycled plastics are large odor, dark color, many burrs, easy aging of plastics and simple cracking, and they will smell after a long time. This will not only shorten the life of the vacuum flask, but also threaten our health.

The fourth type: capacity detection

Because the vacuum insulation cups are double-layered, the practical capacity of the cups will be different from what we have seen. First look at whether the depth of the inner container of the vacuum flask and the height of the outer layer 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 vacuum flask.

Type 5: Identification of stainless steel materials

There are many types of stainless steel materials. Among them, 18/8 indicates that 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. The product is rust-proof and corrosion-resistant. Generally, the color of stainless steel material is whitish or dark. If it is immersed in 1% salt water for 24 hours, rust spots will appear. Some elements contained in it exceed the standard and directly endanger human health.