1, plastic thermal insulation liner: the thermos bottle of plastic thermal insulation liner only has thermal insulation function, and the thermal insulation time is only about 3 hours.

2, ceramic insulation liner: ceramic insulation liner is completely harmless, it will not produce harmful substances like plastic insulation liner, nor will it release a lot of heavy metals like metal insulation liner. The inner container of ceramic thermos cup is a kind of less commonly used material, which is relatively rare in the market.

3, purple sand insulation liner: purple sand insulation liner kettle, this material has insulation function, some better purple sand also has health care and conditioning functions. The purple sand liner is often matched with the stainless steel shell, which can improve the service life of the purple sand cup.

4. Glass insulated liner: The kettle with glass insulated liner is a relatively healthy kettle, but it is not resistant to falling. The substance of glass is relatively stable and will not leak impurities because of boiling water. Glass cups are easier to clean, but not easy to carry around.

5. Stainless steel insulation liner: The insulation pot of stainless steel insulation liner generally adopts food-grade 304 stainless steel, which contains some iron, but some inferior stainless steel will also release some toxic heavy metals.