It's best to choose a silver one. After all, silver ions have a better bactericidal effect than metallic copper and are better for human health.

Choosing the inner container of a thermos bottle can start with the material:

1, plastic insulating gasket

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.

2, ceramic insulation liner

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.

3, purple sand insulation liner

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.