It is possible to make tea in a vacuum flask, but the following points should be done:
1. Choose austenitic 304 stainless steel vacuum flask;
2. The tea should not be soaked for too long, that is, drink it in time after it has been soaked, but it is better to drink it within two hours;
3. Clean the thermos cup in time after drinking tea to reduce the chance of tea scale production in the inside of the thermos cup. As long as you do these points, you can make tea with a vacuum flask.
