Wet extrusion of reinforced thermoplastic

The method of making elongate, extruded thermoplastic products comprising the steps of mixing together (1) thermoplastic resin, (2) fine inert material and (3) water, the quantities of such additives being such that from about 5% to about 60% of the solids is thermoplastic resin, from about 40% to about 95% of the solids is fine inert material and the amount of water is such that the mixture has an extrudable consistency, forcing the mixture through an opening in a machined extrusion die with a pressure of at least about 25 psi forming a uniform elongate extrusion of the extruded material, of a cross-section determined by said die cross-section, drying said elongate member and fusing said thermoplastic resin.