This multi-authored handbook is a practical, industry-oriented overview of current data, descriptions, technology, and applications of thermoset plastics. It is intended to assist the reader in making the right decisions and taking the correct actions in the use of thermoset plastics. The data categories include: Introduction; Phenolic Resins; Urea, Melamine, and Furan Resins; Unsaturated Polyester and Vinyl Ester Resins; Allyls; Epoxy Resins; Thermoset Polyurethanes; Commercial Polyimides; Silicones; Crosslinked Thermoplastics; Research Polymers and Future Directions. -- AATA