Welch preparative column uses the same packing materials as does analytical column, to ensure the best reproducibility of analysis and preparative scale. Special packing technique and stainless modular column tube ensure the stability of column bed. The theoretical plate number for 10 μm column is greater than 35000/m; for 5 μm column, it is greater than 75000/m, and the peak symmetry is around 0.95~1.20.
Ultisil PFP column is a phenyl column where fluorine atoms replace hydrogen atoms on the reversed-phase stationary phase carbon chain. It offers high selectivity for fluorinated and halogenated compounds. With strong geometric and steric shape selectivity, it effectively separates structurally similar compounds that are difficult to resolve with alkyl stationary phases.