* Before testing, hot water is used to preheat the bottle for 1-2 minutes, then the thermos bottle is put in upright position at room temperature for 77 +/- 3.6 °F, inject hot water and let the water temperature dropped to 203 +/- 1.8 °F, or inject cold water and let the water temperature rose to 32 +/- 1.8 °F. The test is started. After 6 hours, temperature is measured at the bottom of the bottle.
When adding hot water, do not pour directly in contact with the bottle.
Avoid dropping or strong collision.
keep the bottle dry as residual water may cause leakage.
Do wash the bottle with dishwasher to avoid deformation or breaking.