First, the use of magnets, method: take two incubators - one suction magnet, the other does not attract magnets, two cups can hold enough water of about 80 degrees, close the lid. After three hours, the temperature of the cup holding the magnet became forty degrees, and the cup without the magnet was still more than seventy degrees. From such an experiment, it can be seen that the effect of the suction cup of the magnet is not strong.
Second, the use of boiling water: After filling with boiling water, screw the bottle stopper or the cup lid clockwise, after about 2-3 minutes, touch the outer surface and the lower part of the cup, if you find a warm feeling, It is not good enough to indicate the insulation performance of the word mug. The sealing of the vacuum flask can also be tested. Fill a cup of water, tighten the lid, invert it for a few minutes, or use a few strokes. If there is no leakage, it will prove that its sealing performance is good.
Third, the use of accessories: the use of accessories is healthy and environmentally friendly. It is very important that the plastic parts of the vacuum flask are healthy and environmentally friendly. It can be identified by smell. If the thermos cup is made of food grade plastic, its smell will be small, the surface will be bright, no burr, long service life and not easy to age; if it is ordinary plastic, then all aspects will be inferior to food grade plastic.