Woulff's 500ml bottle for gas washing is made from high quality borosilicate 3.3 glass Gas washing bottle has two necks with 19/26 sockets Can be used to remove impurities from gasses Ground glass necks allow for easy sealing and exchange Bottle is autoclavable Woulff Gas Wash Bottle made from high quality, heavy duty borosilicate glass. 500ml capacity. Ground glass joints allow for easy sealing and exchange. Can be used to remove impurities from gasses. 3" diameter, 6" overall height. Each neck is 1.5" long and has a diameter of 0.75" and a 19/26 socket. Autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C