1, new vacuum flask should be washed with warm water before use, and rinsed with warm water 1-2 times.To fill hot warter into glass refill, it should be 1-2 minutes after boiled.
2. please don't pour all water out in order to keep temperature in the refill,but please pour all water out before fill hot water into refill.
3.please avoid oil mixed into hot water when you fill hot water, or the refill will be broken easily.
4. after filled fatty foods (such as milk, soup), the refill should be rinsed with warm soapy water.
5. Please don't fill hot water into refill full,keep 5 cm from the mouth of the refill will beter.it can be kept more than 5 thermal insulation to the mouth of the bottle to 6 hours. This is because the heat transfer coefficient of water is 4 times larger than the air, hot water bottle filled with water as the medium, the heat will spread out to cork. If the heat dissipation speed keep the air layer, the heat transfer is relatively slow, warm time is long. In addition the cork is not too tight to avoid heated air fortress, the bottle no expansion caused by sporadic bottle.
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