The testing methods for insulated cups mainly include insulation performance testing, sealing inspection, material verification, and impact resistance evaluation. The core methods are temperature change measurement and inverted water leakage testing. The following are specific steps and standards:
1. Thermal insulation performance test
(1) Hot water insulation test
Pour nearly 100 ℃ boiling water to the top, tighten the cup lid and let it sit for 6 hours, then measure the water temperature with a thermometer. If the water temperature remains above 45 ℃ (6 hours) or around 50 ℃ (8 hours), the insulation effect is qualified.
Temperature difference observation method: After filling with hot water, touch the cup body. If there is no obvious warmth at the bottom or body of the cup, it indicates that the vacuum layer has good insulation effect.
(2) Low temperature environment testing
After adding cold water, let it stand for the same amount of time and observe the temperature difference. The smaller the difference, the better the low-temperature insulation performance.
2. Sealing test
(1) Inverted test
After filling with water, invert for 5-10 minutes and observe for any water leakage. No leakage indicates that the sealing ring meets the performance standards.
(2) Swing test
Tighten the cup lid and shake it vigorously to check for water leakage caused by vibration, which can verify the sealing reliability in daily use.
3. Material and safety verification
(1) Material inspection of inner liner
Prioritize selecting food grade materials labeled as 304 stainless steel or 316 stainless steel to avoid the risk of heavy metal precipitation.
By soaking in strong tea or saltwater, observe whether the inner container changes color or corrodes, and determine the corrosion resistance of the material.
(2) Odor detection
Before using the new cup for the first time, smell the inner container. If there is a pungent odor, it may be caused by inferior plastic or rubber rings, and should be used with caution.
4. Impact resistance and stability
(1) Drop test: Drop a thermos filled with warm water vertically from a height of 40cm onto a hardwood board to check for cracks or decreased insulation efficiency.
(2) Tilt stability: After filling with water, place it on a 15°slope and observe if it tilts to ensure safe daily placement.
