Can The Thermos Keep Warm All The Time?

The thermos cup will not keep warm, because the insulation effect of the thermos cup will gradually deteriorate over time. Vacuuming does not achieve a true vacuum. Therefore, a getter is added to the cup to absorb the remaining air. The getter will have a "shelf life", and the natural insulation effect will become worse after the warranty. Another important reason is that there is no careful care in the use process, which often causes other accidents such as bumps, falling to the ground and other accidents of the vacuum flask, which will greatly reduce the effectiveness of the vacuum flask.