Abstract: A pipe joint of a reinforced resin having a structure in which the wall of at least a socket portion consists of an inside surface layer composed of a cured product of a reinforced resin molding material, an outside surface layer composed of a cured product of a reinforced resin molding material, and an interlayer between these layers composed of a cured product of a resin mortar.

Abstract: A mold for the production of a reinforced plastic tubular body having an annular groove such as a pipe coupling, the mold having a mold body and detachably mounted on a predetermined position thereof, an annular groove former consisting of a surface layer of an elastic material and a core covered with the surface layer. The reinforced plastic tubular body is produced by forming a layer of a molding material around the aforesaid mold, curing the layer of molding material, separating the mold body from the cured layer of molding material, and then separating the annular groove former from the cured layer of molding material by removing the core and then removing the surface layer.

Abstract: A process for producing a thick reinforced plastic article by laminating unit layers of a molding material composed of a thermosetting resin and a reinforcing material, which comprises scattering fibers on the surface of an earlier disposed unit layer while it is in the uncured state, then curing the unit layer, and laminating the next layer on the cured unit layer.

Abstract: A pipe joint of a reinforced resin having a structure in which the wall of at least a socket portion consists of an inside surface layer composed of a cured product of a reinforced resin molding material, an outside surface layer composed of a cured product of a reinforced resin molding material, and an interlayer between these layers composed of a cured product of a resin mortar.