Bullet Type Vacuum Flask

1. Simple identification method for vacuum insulation performance: Pour boiling water into a thermos cup and tighten the bottle stopper or lid clockwise for 2-3 minutes. Then touch the outer surface of the cup body with your hand. If there is a noticeable warming phenomenon on the cup body, it indicates that the product has lost its vacuum degree and cannot achieve good insulation effect.
2. Sealing performance identification method: After adding water to the cup, tighten the bottle stopper and cup lid clockwise, place the cup flat on the table, and there should be no water leakage; The rotation between the cup lid and the cup mouth should be flexible without any gaps.
3. Plastic accessory identification method: The characteristics of food grade new plastics are low odor, bright surface, no burrs, long service life, and not easy aging. The characteristics of ordinary plastic or recycled plastic are strong odor, dark color, many burrs, and easy aging and breakage of plastic.