1, stainless steel insulated inner container water bottle. Stainless steel insulated inner container water bottles are generally made of food-grade 304 stainless steel, which has strong corrosion resistance and low thermal conductivity, and can provide good insulation effect after interlayer vacuum treatment. Stainless steel contains some iron. However, some inferior stainless steel will also release some toxic heavy metals.

2, glass insulation liner open water bottle. High borosilicate glass or borosilicate glass is mostly used in insulated kettles with glass liners, with good high temperature resistance and safe use. Silver plating on glass liner can also use the principle of specular reflection to reduce heat loss and improve heat insulation effect. The material of the glass inner bottle is relatively stable, and impurities will not leak out because of boiling water. But not very resistant to falling.

3, purple sand insulation liner open water bottle. Kettle with purple sand insulation liner, this material has insulation function, and some better purple sand also has the function of health care and conditioning. The purple sand liner is often matched with the stainless steel shell, which can improve the service life of the purple sand cup. Another advantage of purple sand thermos is that it is slow in heat transfer and not easy to heat.

4, ceramic insulation liner water bottle. Ceramic thermal insulation liner, which is completely harmless, will not contain a lot of harmful substances like plastic, nor will it release a lot of heavy metals like metal cups. The inner container of ceramic thermos cup is a kind of less commonly used material, which is relatively rare in the market.

5, plastic insulated liner water bottle. Plastic thermos cup liner is a common material. The thermos cup made of this liner material only has the function of heat preservation, and the heat preservation time is only about 3 hours.