The inner container of the thermos cup is generally made of stainless steel. At present, there are mainly:
201 stainless steel (not recommended): It is not strong in acid and alkali resistance, and some corrosion will occur during use. It is industrial stainless steel and is not suitable for use as a vacuum flask (but many vacuum flask manufacturers use this kind of steel in order to reduce the cost) .
304 stainless steel (recommended): It has good corrosion resistance and forgeability at different temperatures. It is a food-grade stainless steel and is suitable for use as a vacuum flask.
316 stainless steel (recommended): All indicators are better than 304 stainless steel, which belongs to medical stainless steel, and is also an excellent choice for making thermos cups.
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