Can the thermos cup only be a double-layer stainless steel vacuum cup?

Seeing this title, do many friends have the same problem? Why can the thermos cup only be a double-layer stainless steel vacuum cup?Is that so? Before answering this question, let's take a look at how some well-known e-commerce platforms promote the effect of water cup insulation cups.

Is the double-layer glass water cup a thermos cup?Did some friends see many brands and merchants displaying their own glass water glasses when buying glass water glasses, especially when displaying double-layer glass water glasses, deliberately adding heat preservation function, is the double-layer glass water glass insulated?

The double-layer plastic water cup is a thermos cup. In addition to the emphasis on the heat preservation function of the double-layer glass water cup, some merchants also talk about the heat preservation function of the water cup when selling double-layer plastic water cups.Is that a double-layer water cup or a thermos cup?

The definition of thermos cups has strict requirements whether it is the market, the industry or the national standard. According to different capacities, different mouth sizes and cup lid methods, there are strict requirements for the insulation time. If the time is lower than this time, it is not suitable for the insulation cup.

Whether it is a double-layer glass water cup or a double-layer plastic water cup, the heat preservation emphasized by the merchants only slows down the temperature drop for a short period of time, which is far from meeting the heat preservation time requirement. Some "smart" businesses will only talk about heat preservation, but they will never talk about the length of heat preservation.

Double-layer glass water cups and double-layer plastic water cups can slow down the heat conduction phenomenon, but cannot achieve the effect of heat preservation, so double-layer glass water cups and double-layer plastic water cups are not thermos cups.

Please pay attention to friends, the editor is talking about double-layer glass water cups, not thermos cups, but it does not mean that glass water cups cannot be used as thermos cups. Friends born in the 80s and 70s who have used traditional glass thermos kettles should know that the vacuum-pumped and coated glass liner has a strong thermos function. Therefore, glass water cups that have undergone these processes can also function as long-term heat preservation, and such glass water cups can also be called thermos cups.

Seeing this, the editor is equivalent to answering half of the title question. Since the specially processed glass water cup can be a thermos cup, the thermos cup is not only a double-layer stainless steel vacuum cup, but also other metal cups that meet food-grade requirements and can be vacuumed after welding. It is also a thermos cup.For example, food-grade alloys, metal titanium, etc. can be used as materials for making thermos cups. Naturally, water cups produced according to the heat preservation process are also thermos cups.

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