A high-quality vacuum flask must be non-toxic, but must have a good thermal insulation effect. If you don’t understand the way to buy a vacuum flask, it is difficult for us to choose a quality vacuum flask at the time of purchase. Therefore, choosing a high-quality vacuum flask for children also requires some learning.One, it is better to choose the inner and outer double layers of stainless steel. The performance of the vacuum layer is better and lasting. The heavier one will be better, and some lighter ones are unqualified. In addition, if the thickness of the inner and outer layers of steel is too thin, such as a 500ml bullet-shaped vacuum flask, the thickness is only about 0.3, which will greatly affect the vacuum degree during production, and thus affect the vacuum insulation performance of the vacuum flask and heat preservation. The life of the cup will also be shortened. Baby’s thermos, the outer paint must be selected as healthy and safe as possible.
2. Pour boiling water into the thermos cup and tighten the cork or lid clockwise for 2-3 minutes and then touch the outer surface of the cup with your hand. If the cup body has obvious warming, it means that the product has lost its vacuum and cannot reach Good insulation effect.
三, fill a cup of water, screw the lid of the cup tightly, invert it for a few minutes, or shake it a few times, if there is no leakage, it proves that its sealing performance is good. Fill a cup of water, screw the lid tightly, invert it for a few minutes, or shake it a few times. If there is no leakage, it proves that its sealing performance is good.
Fourth, whether the plastic parts of the vacuum flask are healthy and environmentally friendly is very important. It can be identified by smell. If the thermos cup is made of food-grade plastic, its smell will be small, the surface will be bright, 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.
For the stainless steel vacuum flask, the quality of the stainless steel is very important. There are many specifications of stainless steel materials. 18/8 means that the stainless steel material contains 18% chromium and 8% nickel. Only materials that meet this standard are stainless steel materials that meet the specifications and are green products.
5, 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 in line with the nominal value. Some low-quality vacuum flasks add sand and cement blocks to the cup to make up for the missing weight. Misunderstanding: A heavier cup (pot) is not necessarily good. 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 in line with the nominal value. Some low-quality vacuum flasks add sand and cement blocks to the cup to make up for the missing weight. Misunderstanding: A heavier cup (pot) is not necessarily good.
Six, low-quality stainless steel vacuum flasks not only cannot keep warm and leak-proof, but can also cause diseases. In order to avoid consumer health damage, please do not buy low-quality stainless steel vacuum flasks at a particularly cheap price. Stainless steel vacuum insulated cup is also called stainless steel vacuum insulated cup. It is formed by punching and drawing of non-toxic high-quality stainless steel plate, and then vacuum sealed. It keeps the water temperature above 50 degrees within 5 hours. It is hygienic, leak-proof and impact-proof. Popular with consumers. Low-quality stainless steel vacuum flasks not only cannot keep warm and leak-proof, but can also cause diseases. In order to avoid consumer health damage, please do not buy low-quality stainless steel vacuum flasks at a particularly cheap price.