Borosilicate heat-resistant glass flask
The heat-resistant nature of borosilicate makes it the perfect material for your glass flask teapot. We all know the issue with old teapots where it was difficult to determine how strong you had brewed the tea given the lack of transparency. We also all know the trouble of having teapots that lose heat quickly through the sides and occasionally transfer it painfully to your fingers. Fortunately, borosilicate glass will enable you to easily view the progress of your brew while also ensuring that the heat is kept where it needs to be—inside the pot and not outside of it.