A column in which there is a porous layer on the inner wall.
Porosity can be achieved by either chemical means (e.g. etching) or by the deposition of porous
particles on the wall from a
suspension. The porous layer may serve as a support for a liquid stationary phase or as the
stationary phase itself.
Source:
PAC, 1993, 65, 819
(Nomenclature for chromatography (IUPAC Recommendations 1993))
on page 831