A process for molding polyurethane, epoxy, and other liquid chemical systems. A reaction injection molding with a reinforcement added. See also reaction injection molding. A strong material bonded into a matrix to improve its mechanical properties.
Reinforcements are usually long fibers, chopped fibers, whiskers, particulates, and so forth.
The term should not be used synonymously with filler. The time required for a stress under a sustained constant strain to diminish by a stated fraction of its initial value. The initial stress minus the remaining stress at a given time during a stress-relaxation test. A material that is applied in a thin film to the surface of a mold to keep the resin from bonding to the mold. Sec also mold release agent.