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Chromatography Funnel 60 mL. 68mm top OD, 9mm stem OD, 20mm stem length, 65mmheight. CP Lab Safety's chromatography Funnels are unbreakable and made of chemically resistant high density polyethylene (HDPE). The perforated sides with closed-end design facilitate the gentle addition of solvents, which pour gentle out tiny side holes in the bottom of the funnel and down the sides of the column instead of marking a sudden splash straight onto the silica gel. This unique function makes them superior to ordinary funnels when working with flash chromatography.