After testing the thermal insulation performance and sealing performance, we will test whether the stainless steel material of the thermos cup is qualified. We open the cup lid and pour out the hot water in the cup. At this point, the editor just wants to share another article about the insulation performance. After pouring out the high-temperature hot water in the cup, friends place the cup mouth upward on the table. , the results of the thermal insulation performance of this water cup can be obtained through observation.
When the thermos cup with better thermal insulation effect is poured out the hot water and left to stand, the remaining water stains in the cup will evaporate quickly. On the contrary, the slower it evaporates, the worse the insulation performance of the water cup is. Let me give you a reference time (because the water cup is The diameter of the mouth is different and the structure of the water cup is different. This reference time is only a comparative data and cannot be used as an accurate measurement condition.)
5 minutes. If the water completely evaporates within this time, it means that there is no problem with the performance of the water cup thermos. The shorter the time, the better the insulation effect. On the contrary, the longer the time exceeds this time, the worse the insulation effect of the water cup. After the water inside the thermos cup is completely dry, we find a magnet. Friends who don’t have magnets can check whether their Bluetooth headsets and other items contain magnets. Use magnets to absorb the inner wall of the water cup to see if it is magnetic. It is usually used as food in the production of water cups. Grade 304 stainless steel and 316 stainless steel have very weak or even no magnetism.
At present, the international market requires that the safe material for the production of thermos cups should be 304 stainless steel or 316 stainless steel. Stainless steel with neither of these two grades cannot be used as a material for the production of thermos cups. If you find that the magnetism is very strong during the test, it means there is something wrong with the material. If you find that the magnetism is very weak or cannot be felt, it means the material is 304 stainless steel or 316 stainless steel.
Many of the thermos cup liner purchased by my friends will have material numbers on the bottom, such as SUS304 or SUS316. When doing the magnet magnetic test, friends should not only test the inner wall of the water cup liner, but also test the bottom of the water cup liner with the magnet. If you find that the magnetism in these two places is different, it means that the materials inside the liner of this water cup are different, which is also problematic. Although it cannot be said that the material is unqualified, there must be suspicion that the goods are incorrect.
Post time: Dec-23-2023