Plastics, thermoset, spray

Corrosion Resistant Fiber-Reinforced Plastic (FRP). Fiber glass reinforcement bonded with furfuryl alcohol thermosetting resias provides plastics with unique properties. Excellent resistance to corrosion and heat distortion coupled with low flame spread and low smoke emission are characteristics that make them valuable as laminating resins with fiber glass (75,76). Another valuable property of furan FRP is its strength at elevated temperature. Hand-layup, spray-up, and filament-win ding techniques are employed to produce an array of corrosion-resistant equipment, pipes, tanks, vats, ducts, scmbbers, stacks, and reaction vessels for industrial appHcations throughout the world. 

The resin matrix can be either thermosetting or thermoplastic. Thermosetting resins such as epoxy, polyimide, polyester, and phenolic are used in applications where physical properties are important. Polyester and epoxy composites make up the bulk of the thermoset composite market. Of these two, polyesters dominate by far. Reinforced with glass fiber, these are known as fiberglass-reinforced plastics (FRPs). FRPs are molded by layup and spray-up methods or by compression molding either a preform or sheet molding compound (SMC). 

An alternative to rubber linings which suit corrosive environments are glass flake reinforced plastics. They combine impact, erosion and abrasion resistance and can be applied on site using a spray or brush. They are compounds of glass flakes with various corrosion resistant thermosetting resins combined in different ratios. The excellent adhesion enables bonding with steel at temperatures as high as 170 "C. 

Deductive mold materials are removed to form the desired shape. Inductive mold materials are built up to form the desired shape. Hardwoods, fiberboard, and industrial plaster are examples of deductive materials, which under certain circumstances can also be used inductively. Syntactic foam, thermoset plastics, papier mache, and sprayed white metals are normally considered to be inductive materials. 

---