With the wider acceptance of plastics as materials of construction, many new plastic systems have been developed in the last few years. This paper will review some of these developments as they relate to thermosetting resins. As the name implies, thermosetting resins set with, rather than become fluid on heating. In general terms they include: 1. Epoxies, 2. Polyesters, 3. Phenolics, 4. Furanes, 5. Combinations of resin systems, and 6. Certain special systems such as vinyl butadienes. Thermoplastic resins, on the other hand, generally soften with temperature and include materials such as vinyls, polyethylenes, polypropylenes, fluorocarbon, nylon, etc.

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