Abstract: The folding partition system disclosed is composed of a series of panels, and incorporates a hinge-post molding located between each two successive panels. A hinged joint created between the panels features on the one hand, two mating surfaces having a profile in the form of an arc of a circle the radii of which converge on a hinge pin, and on the other, two seals which remain in contact with these mating surfaces when the panels are swung on the hinge-posts.