Reaction Injection Molding ( or RIM) is a process in which two reactive liquid components -- a polyol and an isocyante - are metered, blended together, and injected into a closed mold at low pressure. The two materials fill the mold easily because they have a viscosity similar to that of water. The chemical reaction between the two components forms a polyurethane structural foam part with a dense, durable skin and a low density cellular core.

Process Characteristics
Part Cost - moderate to high Tooling Cost - low Production Rate - moderate Parts can be molded in color with good surface finish Material can be reinforced Material is very impact resistant
Examples
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