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50ml capacity. This open top, cylindrical dropping funnel is made of high quality Borosilicate glass. Funnel includes a PTFE key stopcock. Funnel measures 8" in length, and neck diameter of 1.1". Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.