olybutylene terephthalate (PBT) is a thermoplastic polyester obtained through polycondensation. It is known for its high stiffness, thermal stability, and good chemical resistance. As a member of the polyester family (alongside PET), PBT is a popular material for technical applications where dimensional stability, mechanical strength, and electrical insulation are important.olybutylene terephthalate (PBT) is a thermoplastic polyester obtained through polycondensation. It is known for its high stiffness, thermal stability, and good chemical resistance. As a member of the polyester family (alongside PET), PBT is a popular material for technical applications where dimensional stability, mechanical strength, and electrical insulation are important.
• Automotive industry: Engine compartment components, connectors, light housings, sensors, bulb holders, control unit housings.
• Electronics and electrical: Production of connectors, relays, switches, insulators, PCB components, sockets, and enclosures.
• Household appliances: Parts exposed to heat, moisture, and wear—e.g., housings for blenders, coffee machines, dryers.
• Industrial equipment: Technical components such as gears, bearings, guides, sliders, and housings requiring durability and chemical resistance.
• Packaging: Used in packaging requiring high mechanical and chemical resistance.
• Good thermal resistance: PBT withstands elevated temperatures (up to ~150 °C in reinforced grades), allowing use in technically demanding environments.
• Excellent dimensional stability: Low moisture absorption and high crystallinity ensure dimensional accuracy even in humid conditions.
• Good chemical resistance: Resistant to oils, greases, fuels, alcohols, and acid solutions, making it suitable for automotive and electrical applications.
• Good electrical properties: Excellent insulation characteristics make it ideal for components in electronic devices.
• Reinforcement capability: Glass fiber reinforcement significantly improves stiffness and heat resistance.
• Limited UV resistance: Without stabilizers, PBT is not suitable for prolonged outdoor exposure.
• Brittleness at low temperatures: Unfilled grades may become brittle below 0 °C.
• Not suitable for continuous steam contact: Prolonged exposure to steam can degrade mechanical properties.
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