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Solid, reliable Restek Roc Phenyl-Hexyl HPLC columns are pressure rated for any 400-bar HPLC system and deliver the peak shape, reproducibility, ruggedness, and performance you demand for all of your conventional HPLC applications. The Restek Phenyl-Hexyl features a phenyl ring attached to a 6-carbon chain. This high-purity, highly retentive phase features alternative selectivity to straight chain hydrocarbon phases like C8 or C18, and it is especially useful for aromatic analytes and complex samples.