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An historical overview of the use of composites in the automotive industry is given with emphasis given to the advantages and limitations of particular processes for various applications. Structural RIM is described as a process which combines high productivity with controlled, predictable part properties. After the materials are briefly described, some new studies which investigate what is actually occurring in the mold during the Structural RIM process are discussed. Some early results of these studies are analyzed and areas of future study with the tools of this investigation are outlined.

The basics of Structural RIM processing for high volume applications are discussed, and several developments which impact the costs and efficiency of this process are described. These developments include flow characterization and modelling, glass handling techniques and venting techniques and systems containing internal mold release.