Our Flask Volumetric With Interchangeable Glass is claimed to be calibrated at 20 Degree C, which makes it suitable for keeping your drinks cold without freezing. It is also manufactured from 3.3 borosilicate glass for corrosion free performance and has an ergonomic shape that makes it easy to carry. Flask Volumetric With Interchangeable Glass is designed with a glass body to prevent the product from spilling while in the refrigerator and freezer environment.