Thermosets are a key group of polymers. Understanding how their chemistry and structure affects their properties is essential to their manufacture and use in a range of applications. Thermosets: Structure, properties and applications reviews both factors affecting thermoset properties and how this understanding can be used to engineer thermosets for particular uses. Part one reviews mechanical and thermal properties, including the role of nanostructures in thermoset toughening. Applications of thermosets are the focus of part two, including the use of thermosets in the building and construction industry, aerospace technology and as insulation materials. Thermoset adhesives are also discussed, followed by a final review of thermosets for electrical applications.