It should be that the quality of the thermos cup itself is not good, so it is better to change it. What you drink in your stomach is still the most important thing. I use my face. It's okay. You can try. I used a antler cup and bought a children's cup for my son. So the materials in their home are trustworthy. Children's cups are all made of 3 16 stainless steel, and adult cups are made of 304 food-grade stainless steel.

Advantages of 304 stainless steel liner: good high temperature resistance, and the temperature limit is generally 650℃. 304 stainless steel has excellent corrosion resistance and intergranular corrosion resistance. Therefore, 304 stainless steel is widely used in medical instruments and food utensils, and the inner container of hot water kettle does little harm to human body.

Advantages of 3 16 stainless steel liner: excellent corrosion resistance and high temperature strength, which can be used in harsh conditions, good work hardening and non-magnetism. Compared with 304 stainless steel liner, the cup has higher structural strength and longer service life.

Antler cup, high value ~