Capillary columns are disclosed comprising a capillary of which the inner diameter is less than 1000 mu m and a continuous porous silica gel which uniformly fills the capillary, said silica gel containing both continuous through pores having diameters ranging from 0.5-5 mu m and mesopores having diameters ranging from 2-50 nm; these columns are useful in separating equipment like liquid chromatographs, gas chromatographs, or electrophoresis equipment.
