For the thermal insulation performance, at a room temperature of 20℃±5℃, if the kettle is empty and left open for 30 minutes, fill the kettle with 100℃ water below the maximum water level, and tighten the lid immediately after the water temperature drops to 95℃±1℃, then begin timing. The temperature of the water will remain above 75℃ after 6 hours and above 65℃ after 12 hours.
For the cold preservation performance, at a room temperature of 20℃±5℃, if the kettle is empty and left open for 30 minutes, fill the kettle with 0℃ water below the maximum water level, and tighten the lid immediately after the water temperature rises to 4℃±1℃, then begin timing. The temperature of the water will remain below 9℃ after 6 hours and below 12℃ after 12 hours.