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What is a stainless steel thermos cup?

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What is a stainless steel thermos cup?
The stainless steel thermos cup 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 extracted by vacuum technology to achieve the effect of vacuum insulation. Stainless steel thermos cups are divided into: ordinary thermos cups (the heat preservation time is generally less than three hours after boiling water is poured in), vacuum thermos cups (through the vacuuming process, the boiling water can be kept warm for more than 8 hours).

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