Polybutylene terephthalate (PBT), a semitransparent to opaque, crystalline thermoplastic polyester. It boasts high heat resistance, toughness, fatigue resistance, self-lubricating properties, low friction coefficient, weather resistance, and low water absorption rate of only 0.1%. It maintains various physical properties (including electrical properties) in humid environments, excellent electrical insulation properties, but with high volume resistance and dielectric loss. It is resistant to hot water, alkalis, acids, oils, but susceptible to halogenated hydrocarbons and has poor hydrolysis resistance. It can crystallize rapidly at low temperatures and has good molding properties.PBT resins are mainly processed into compounded materials, modified with various additives, and when blended with other resins, they offer excellent heat resistance, flame retardancy, electrical insulation, and good processing properties. They are widely used in industries such as electrical appliances, automotive, aviation manufacturing, communications, home appliances, and transportation. For instance, modified with glass fibers, PBT can be used to produce electronic components that require high dimensional stability under conditions of long-term exposure to high temperatures.