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Buchner funnel made of high quality, heavy duty 3.3 borosilicate glass. 500ml capacity. Plain Stem. Funnel features a sintered disc with G-3 porosity.Measures 10.5" in total height. Inner diameter of body measures 3.75" (94mm) and outer diameter measures 4" (101mm). Stem measures 4.75" in length and has an 12mm inner diameter, and 16mm outer diameter. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.