Check the tightness
After adding water to the cup, tighten the lid in a clockwise direction, place the cup flat on the table, and there should be no water leakage. The screwing of the lid and the mouth of the cup should be flexible and there should be no gap.
Test heat preservation
Pour boiling water into the thermos cup and tighten the lid clockwise. After 2-3 minutes, touch the outer surface of the cup body with your hand. If the cup body has obvious warming phenomenon, it means that the product has lost its vacuum and cannot achieve a good insulation effect.
Check all parts of the cup
The characteristics of new food-grade plastics are small smell, bright surface, no burrs, long service life and not easy to aging. Ordinary plastics or recycled plastics are characterized by big smell, dark color, many burrs, and plastics are easy to age and break easily.
Check the weight of the cup
It is not that the heavier the cup, the better, the depth of the inner container of the thermos cup is basically the same as the height of the outer shell, and the capacity (with a difference of 16-18MM) is in line with the nominal value.
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