Material: PP with special membrane. Further attractive products to complete your chromatography laboratory can be found on our Chromatography page! Automatic separation of a two-phase mixture without separation funnel. Two-phase mixtures are completely applied to the column and the phase boundary is determined without further work. The special membrane automatically stops the flow when the lower phase has passed. The upper phase remains in the column, thus both phases are available for futher analysis. Important note: Columns must not be run with vacuum or pressure. SPE columns for phase separation by gravity only. You replace the complex liquid-liquid extraction (LLE) with solid-liquid extraction (SLE). These columns guarantee a far greater yield and better reproducible extraction process, from column to column, when compared to historical liquid/ liquid extraction techniques usually using water and an organic solvent into a conventional separation funnel. Fast and effective sample preparation technique Higher reproducibility and recovery rates compared to LLE methods No problems with phase boundaries - Prevents the emulsion formation that often occurs in LLE, since the water-immiscible solvents do not come into direct contact with the sample Reduced solvent requirements compared to LLE Polypropylene columns CHROMABOND ® PTL PTL for solvents lighter than water, e.g., for diethyl ether, hexane.