The invention relates to a connection device (1) made of a plastic material including a tubular body (2) with a connection section (3) for a pipe (5) made of a plastic material intended for being fitted into said connection section (3). Said connection section (3) has a connection end with an inner annular shoulder (9A) accommodating a ring (8) made of a plastic material laden with metal particles (12) dispersed in the plastic material of the ring (8).
