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Is a Good Vacuum Flask That Can Be Attracted by a Magnet?

With the improvement of the quality of life, the stainless steel vacuum flask has become a friend of the general public, but how to buy a stainless steel vacuum flask is a worry for consumers. In many cases, a lot of money is spent, but the insulation performance of the vacuum flask I bought is very poor. Even more frightening is the purchase of inferior products. Inferior thermos cups not only fail to keep warm, but can also cause harm to the human body. Can a magnet be used to judge the quality of a stainless steel vacuum flask?


1. Can a magnet be used to judge the quality of a stainless vacuum flask?


The answer is no. It is wrong to use a magnet to identify, and the only thing that a magnet can attract is ferritic stainless steel. Ferritic stainless steel generally refers to an iron-based alloy with a chromium content of 11% to 30% and a crystal structure of a body-centered cubic lattice. In addition to some chromium elements, other alloying elements, such as molybdenum, aluminum, and titanium, are added to form and stabilize the ferrite structure. The carbon content of ferritic stainless steel is relatively low, less than or equal to 0.12&, but the carbon content of cast ferritic stainless steel ZGCr28 is relatively high, reaching 0.05% to 1.00%.


People often think that the magnet is adsorbed on the stainless vacuum flask to verify its pros and cons and authenticity. People think that what can't be attracted by a magnet is good, and the product is genuine; if it can be attracted, it is magnetic, which is considered to be a counterfeit. In fact, this is an extremely one-sided and unrealistic way of identifying errors. So how to distinguish the pros and cons of stainless steel vacuum insulation cups?


2. How to distinguish the advantages and disadvantages of the stainless vacuum flask?


Thermal insulation of the vacuum insulated cup: The stainless steel insulation cups on the market are mainly divided into ordinary insulation cups and vacuum insulation cups. The vacuum insulation cup is divided into two layers, and the middle layer is vacuum, so that there is no medium for the heat inside the cup to spread out. In addition, a reflective layer is applied between the two layers to reflect the heat back and reduce heat loss.


The tightness of the vacuum flask: After adding water to the cup, tighten the cork 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 mouth of the cup should be flexible. There is no gap.


Hot water detection method: This is the simplest method. Add boiling water to the stainless steel vacuum flask, hold the outer wall of the vacuum flask with your hand after two or three minutes to see if the outer wall is very hot. If the outer wall temperature is relatively high, it means that this cup is not qualified.


Shanghai Solid Stainless Steel Products Co., Ltd. is one of the earliest domestic companies to produce stainless steel containers, specializing in the production of stainless steel insulation products (cups, kettles). The current product range includes more than 300 products in four series: "home series", "travel series", "office series" and "hotel series". Please feel free to contact us for consultation. 


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