Is the straw cup warm? Can the straw cup keep warm?

1, different straw cups have different heat preservation time. A good thermos can keep warm for about 12 hours, while a poor thermos can only keep warm for 1-2 hours. In fact, the general thermos can be kept for about 4-6 hours. When buying a thermos, there will be an introduction to explain how long it will be kept.

2. The insulation effect of the thermos cup will gradually deteriorate with the increase of time.

3. Vacuum pumping can't achieve absolute vacuum, so a getter will be added to the cup to absorb the residual air. The getter has a "shelf life", and the natural heat preservation effect will become worse after the quality is guaranteed.