‘- Equipped With Interchangeable Joints – These Flasks Can Be Closed With A Glass Stopper – Uniform Wall Thickness Distribution Makes These Flasks Ideal For Heating – While Heating Stopper Should Be Removed – The Conical Form Makes Them Suitable For Mixing Liquids – Coloured In Amber To Protect Light-Sensitive Material – The Amber Colour Is Applied Only To The External Surface To Prevent Contamination With The Testing Material Material: Made Of Low Expansion 3.3 Borosilicate Glass Compliance: Complies With Is 1381 (Part I), Din / Iso 1773