These two have different properties and therefore the type of plastic used depends on the use and product. The most common example of a thermosetting polymer is that of Bakelite, which is used in making electrical insulation. Chemistry and Technology of Epoxy Resins, ed. When used as the binder for aggregates and other solid fillers, they form particulate-reinforced polymer composites, which are used for factory-applied protective coating or component manufacture, and for site-applied and cured construction, or maintenance purposes. 1. Duroplast, light but strong material, similar to bakelite used for making car parts 5. Reactive Polymers Fundamentals and Applications: A Concise Guide to Industrial Polymers (Plastics Design Library), William Andrew Inc., 2nd edition, 2013. However, this is a temporary state as the molten form of thermoset lasts only for a short time because the increase in temperatures promotes cross-linking. It may also be used as an adhesive. The picture below shows a typical structure for a thermosetting polymer. Usually glass filled. Once hardened, a thermoset cannot be melted for reshaping, in contrast to thermoplastic polymers which are commonly produced and distributed in the form of pellets, and shaped into the final product form by melting, pressing, or injection molding. Subsequent chemistries have been developed to produce thermosets that process more easily and are more heat resistant. [10] New developments involving thermoset epoxy resins which on controlled and contained heating form crosslinked networks permit repeatedly reshaping, like silica glass by reversible covalent bond exchange reactions on reheating above the glass transition temperature. Urea-formaldehyde foam used in plywood, particleboard and medium-density fiberboard 6. Epoxy; Silicone; Polyurethane ; Phenolic; So this is all about types of plastics with their corresponding properties. Most polymers are formed by processing crude oil. Bakelite, Kevlar, and vulcanized rubber are also thermoset plastics. Thermosetting Plastic Advantages and Disadvantages Some main advantages of thermosetting plastics include – they are more resistant to high temperatures, they have high levels of dimensional stability, are cost-effective, and allow highly flexible design. Bruins, Gordon and Breach, New York, 1976. It is a brownish solid substance and was also the first plastic ever made with synthetic components. No Signup required. 1. These plastics are generally used for electrical fittings, radio and television cabinets, buckles, handles, etc. Common examples of thermoset plastics and polymers include epoxy, silicone, polyurethane and phenolic. It is mainly used for making electrical switches, handles of various utensils, etc. Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. G Oertel, Hanser, Munich, Germany, 2nd edition, 1994. The cross-linking process eliminates the risk of the product remelting when heat is applied, making thermosets ideal for high-heat applications such as electronics and appliances. [7][8] Application/process uses and methods for thermosets include protective coating, seamless flooring, civil engineering construction grouts for jointing and injection, mortars, foundry sands, adhesives, sealants, castings, potting, electrical insulation, encapsulation, 3D printing, solid foams, wet lay-up laminating, pultrusion, gelcoats, filament winding, pre-pregs, and molding. These plastics cannot be softened again on heating. 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