Rigid macroporous polystyrene-based and polyacrylamide-based packings have been developed for reversed-phase high-performance liquid chromatography. Data on pore size distribution, total pore volume and surface area have been obtained for comparison with silica-based packings. Columns containing these polymer-based packings have good permeability with maximum working pressures of 5000 p.s.i. and 3500 p.s.i. for polystyrene-based packing differs from that for the polyacrylamide-based packing. The dependence of column efficiency on teh flow velocity of the mobile phase as a function of solute type and temperature has been studied. Plate height is reduced as a function of solute type and temperature has been studied. Plate height is reduced considerably at higher temperature. This is tentatively interpreted in terms of a reduction in solute dispersion due to improved mass transfer in the stationary phase.