Is a cheap thermos container harmful?

Cheap thermos liners are harmful. The content of manganese in the materials used in inferior electric kettles is as high as 10%, so there is a problem of using high manganese steel. If we use this kettle for a long time, the venom will enter the human body after the inner surface of the kettle is eroded.

Hot water bottle knowledge

Thermos bottles are also called thermos bottles, thermos bottles and water bottles. Its shell is made of plastic, iron sheet or bamboo strips, and is equipped with a double-layer glass liner. The interlayer glass is silver-plated and the bottle mouth is cork, which can keep the temperature of boiling water in the bottle for a long time. 1892, the British scientific research institute made a double glass container, painted the inner glass wall silver, and then pumped out the air between the double glasses.

The thermos bottle is made of double glass, and the glass wall is plated with silver like a mirror, which can reflect the heat flowing in the bottle back. The air between the double glazing is pumped out, forming a vacuum. Air is the medium of heat transfer, and the vacuum layer increases the difficulty of heat dissipation. Adding a cork to the bottle mouth cuts off the heat dissipation path, but the boiled bottle can't keep warm all the time and can only slow down the heat dissipation time.