a method for producing composite , structural plastic parts in traditional foundry molds , including sand , permanent , die - cast , wax and investment molds . short fiber length fibers reinforcing low viscosity thermoset resins , and in particular resole phenolics , provides a pourable low bulk density polymer compound with minimal externally applied thermal requirements during molding and post cure when required . foundries can consider metal parts replacement with this new method . it permits foundries to actually produce composite , structural plastic parts with superior mechanical and thermal properties . this permits them to provide plastic products on a competitive basis with the compression and injection molders .