Vacuum flask plastic cover or a cork cover?
Cork is better, because the stopper can swell after water immersion, better sealing effect, if not the best of food grade of plastic cannot be used for a long time, have some side effects to the body. And get a little plastic smell.
If you have the quality of the water bottle is qualified, then pour out the water is not toxic. Because the plastic should be tested will be put into use. Not all plastics are toxic, even under the condition of high temperature.
Cork is good, because a cork after water can expand, not only to achieve better sealing effect and the soft, good thermal insulation (gap reduces the thermal radiation, convection and conduction). If a plastic plug inside is empty, the air inside to convection; If the internal is not empty, easy to heat conduction and plastic smell. Short time use, generally do not affect health, because can use in the food or the plastic on the tableware, are processed.
Sure is good ah, wood or home hot pot: why do you want to use wood plug
