Polyurethane foam 3. The final stage is where the cross-linking reaction occurs and the final structure of thermosets is constructed. The two thermoset molding compound processes are Reaction Injection Molding and Resin Transfer Molding (RTM).. Composite thermoset materials consist of a matrix and a dispersed, fibrous, or continuous second phase. Thermosetting Plastics are cross-linked polymers: 2. 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