The Reaction Injection Molding (RIM) process economically produces low-quantity injection-molded parts for the life-sciences industry. Medium-sized to large enclosures and housings can be produced from low-cost tooling. Designing for the RIM process is easier than designing injection-molded parts because the RIM process allows more design freedom. The RIM process is relatively new and perhaps the least understood and most underutilized of the low-pressure processes for plastic parts. Recent developments in resins have allowed this high-value process to compete with injection molding. Thin-wall parts that meet UL flame requirements can be produced with faster cycle times. OEMs in the life-sciences industry are using RIM instead of injection molding, vacuum forming, pressure forming, structural foam, sheet metal, or metal casting. RIM’s lower-cost tooling allows them to get their products to market faster and to change them more frequently to meet the demands of their marketplaces.