The invention relates to a method for the production of a device for filtering the soot particles which are present in the exhaust gas of an internal combustion engine. The method consists in extruding a filtering substrate comprising a plurality of parallel channels; one end of the parallel channels is alternately obstructed; the substrate is cut up; the cut-up outer peripheral surface of the substrate is coated with the aid of a surface application paste; said paste is allowed to penetrate the insides of the cut-up channels on the periphery of the substrate then the surface application paste is hardened; the coated substrate is placed inside a cover and is maintained with the aid of the surface application paste. The invention also relates to a filtering device, particularly one used to carry out said method.
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