The stainless steel vacuum flask is made of double-layer stainless steel inside and outside. The inner tank and the outer shell are combined by welding technology, and then the air in the interlayer between the inner tank and the outer shell is drawn out by vacuum technology to achieve the effect of vacuum insulation.
Stainless steel insulation cups are divided into: ordinary insulation cup (the heat preservation time is generally less than three hours after boiling water is poured in), and vacuum insulation cup (through the vacuum process, the boiling water can be kept for more than 8 hours).