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This 50ml separating funnel has a robust pear shaped body with a 2.25" diameter at its widest point. The item measures 8" in height when positioned upright and is designed with a glass stopcock that allows optimal control of flow when working with liquids in the lab. The interchangeable 14/23 stopper fits the 0.6" opening at the top of the funnel. It is made from quality borosilicate glass. Ungraduated. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.