What is the material of the inner liner of the warmer?

Inner material: metal material, glass material.

1, made of metal materials, generally stainless steel inner and outer, vacuum in the middle.

2, made of glass materials, generally the inner and outer layers of glass, the middle of the vacuum, and in the middle of the two layers of glass on the surface of the ferry with mercury or aluminum, respectively.

Kettle insulation principle:

Heat distribution is divided into conduction, convection, and radiation, it is the use of the principle of these three. The bottle stopper is made of cork, and cork is not easy to conduct heat, and try to prevent the occurrence of conduction; the middle of the warmer is a vacuum, try to prevent the occurrence of air convection; and the bottle liner plated into a silver-white color, which can make the heat reflected back into the bottle without radiating out.

The kettle has an inner wall and an outer wall; there is a vacuum between the two walls. Heat conduction and convection are not possible in a vacuum, and the plated metal reflective layer reflects heat radiation. So any liquid poured into the bottle can maintain its original temperature for a considerable period of time. This is the reason why thermos bottles keep drinks warm and hot in winter and cold in summer.