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The vacuum insulation layer in the thermos cup can delay the heat dissipation of the water and other liquids inside, so as to achieve the purpose of heat preservation.
The global and Chinese turnover of the stainless steel vacuum flask market was approximately US$4.1 billion in 2018 and is expected to reach US$5.6 billion by 2025.
People's Daily Online once said that "304 steel is recommended for the purchase of stainless steel products."
