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Thermoplastic polyesters are widely used in the automotive industry and are the material of choice for many types of electrical and electronic components due to their excellent balance of mechanical and electrical properties. Under certain conditions including elevated temperatures and the presence of high humidity, thermoplastic polyesters such as polybutylene terephthalate (PBT) have the potential to suffer hydrolytic attack. Recognizing the need for standardization, USCAR USCAR (The United States Council for Automotive Research) established component level testing guidelines specific to connectors. In response, many companies developed HR (hydrolysis resistant) PBT resins to help manufactures meet these requirements. As with many additive technologies in plastics, there are trade-offs. In this case, hydrolysis resistance was often improved at the expense of melt viscosity stability and high flow during the injection molding process.