Borosil Separatory Funnels use a self-lubricating, replaceable PTFE stopcock that does not require grease or lubrication in order to achieve fine, smooth control of flow. Glass pennyhead stoppers included. For the best performance in the world, check out Borosil Boroflo Screw-Thread Separatory Funnels (Product Family 6402). Borosil Separatory Funnels comply with DIN/ISO 4800. 60mL and 125mL options are not covered in DIN/ISO. Available from 60mL to 2L. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil Type 3. 3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil Glassware is stress-free and incredibly resistant to thermal shock.