The button on the lid is made of plastic, which prevents scalding when removing the lid. Lid and sieve are made of stainless steel lid 18/10, which ensures that no rust. Healthy, clear borosilicate glass withstands temperature fluctuations from minus 30 ° C to plus 150 ° C. It stays intact, even if you pour boiling water into a frozen jug. So the teapot is healthy and durable enough to be used.
Borosilicate glass is known for its low thermal expansion and high thermal stability. It can be used on gas, electric hob (not induction hob) stoves and many others.
Make sure there are no residues in your tea. The strainer can be removed if the tea is not to be soaked for too long. Without the sieve, the lid can still cover the pot.