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Plastic materials have made significant progress in small engine components. Most of these applications have been in external parts like fan shrouds and fuel tanks. Meeting new emissions requirements, along with reducing noise and more compact engine styling will require plastic materials which perform at higher temperatures than those typically used to date, as well as materials which can replace mechanical parts now produced in metal. This paper presents mechanical performance data at temperatures up to 200°C for several engineering phenolic compounds. Also reviewed are fluid resistance, fatigue endurance, and examples of phenolics in production components in small engines.