1. Discrimination of thermal insulation performance: The thermal insulation performance of thermos mainly refers to the inner container of thermos, which is a very important technical index. After filling with boiling water, tighten the bottle stopper or hot water bottle cap clockwise. After about 2-3 minutes, touch the outer surface and lower part of the cup. If you find a warm feeling, it means that the insulation performance of the thermos is not good enough. ?

2. Look at the tightness of the thermos cup. Fill a glass of water, tighten the lid, turn it upside down for a few minutes, or shake it hard. If there is no leakage, it proves that the sealing performance is good. ?

3. Whether the accessories used are healthy and environmentally friendly. Whether the plastic part of the thermos cup is healthy and environmentally friendly is very important. Can be identified by smell. If the thermos cup is made of food-grade plastic, it has small smell, bright surface, no burr, long service life and is not easy to age. If it is ordinary plastic, it will be inferior to food-grade plastic in all aspects.

Extended data:

Precautions:

1. Cleaning of vacuum flask: Clean the newly bought vacuum flask with neutral detergent and warm water before use. Never use alkaline detergent, it will have a bad influence on the cup, thus affecting the service life of the cup.

2. Cup cover: Do not use too much force when screwing the cup cover, as long as it is tightened to ensure no water leakage. Excessive use may lead to the failure of the screw of the cup and affect the carrying.

3, the amount of water: it is not appropriate to add hot water to the cup too full. If the water is too full, it will not only overflow and burn, but also if the upper cover of your thermos cup is plastic, if the plastic is exposed for a long time, it will easily lead to deformation or molecular structure change, which is not good for health.

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