“Reaction injection molding (RIM) is similar to injection molding except thermosetting polymers are used, which requires a curing reaction to occur within the mold. Common items made via RIM include automotive bumpers, air spoilers, and fenders.” 

“First, the two parts of the polymer are mixed together. The mixture is then injected into the mold under high pressure using an impinging mixer. The mixture is allowed to sit in the mold long enough for it to expand and cure.” (

“The most common RIM processable material is polyurethane, but others include polyureas, polyisocyanurates, polyesters, polyepoxides, and nylon 6. For polyurethane one component of the mixture is polyisocyanate and the other component is a blend of polyol, surfactant, catalyst, and blowing agent.”

(Wikipedia, Reaction Injection Molding (RIM) 1/27/2011)

Injection Molding
Reaction Injection Molding (RIM) Applications
Processing    

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