PBT

Polibütilen Tereftalat (PBT) Polybutylene Terephthalate (PBT) is a semi-crystalline thermoplastic engineering polymer. PBT is produced by polycondensation of terephtalic acid or dimethyl terephthalate with 1,4-butanediol using special catalysts. The PBT polymer provide many benefits for injection molding. These include: • Reinforced (glass fiber, carbon fiber) • Flame reterdant • Mineral filled • Impact modified The unfilled PBT materials produced in many melt viscosities. This provide the users to handle extrusion and injection process easily. Chemical and Physical Properties of PBT • It has very good stain resistant and machining characteristics. • It delivers very good short-term mechanical properties, such as high strength, toughness and stiffness as well as good practical impact. • It provides good creep resistance, dimensional stability and low moisture absorption characteristics. • It gives good durability under thermal stress and harsch chemical environments, particularly in automotive underhood applications. • PBT's high heat-deflection temperatures and high temperature index ratings help components withstand both short term thermal excursions and long-term heat exposure • Polybutylene Terephthalate helps protect electrical and electronic components with extremely high electrical resistance and high dielectric strength that guard against leakage and breakdown in power circuitry • The low dielectric loss minimizes energy absorption in high frequency electronic uses. • Blocks UV radiation and excellent heat aging behavior. • It has strong chemical resistance to a wide range of chemicals such as diluted acids, alcohols, aromatic hydrocarbons, ketones etc., solvents, oils and greases. This makes it suitable for use to produce plastic parts that are exposed to organic solvents, gasoline, oils and hence avoid erosion after period of time. Limitations of PBT • High mold shrinkage • Poor resistance to hydrolysis (sensitive to hot water) • Inclined to bend due to high differential shrinkage • Unreinforced PBT is notch sensitive PBT Alloys PBT/PC Blends provide; high toughness, down to -40°C, good heat resistance, up to 140°C, improve weatherability, good UV resistance, high color retention, Food and Drug Administration (FDA) compliant. PBT/ASA is alloy with improved surface quality, scratch property and UV resistance. Offers lower specific gravity advantage compared to unfilled PBT. PBT/PET Blends improve mechanical properties compared to unfilled PBT PBT Applications • PBT polymer gives good durability under thermal stress or harsh chemical environments, particularly in automotive underhood applications. • Connectors, sensor housings, chip sockets • Windshield wiper covers • Door handles • Front end frames PBT's extremely high electrical resistance and high dielectric strength help protect electrical and electronic components by providing guard against leakage and breakdown in power circuitry. • Switches, circuit breakers • Cable liners and fiber optic buffer tubes • Power sockets for modular building panels PBT provide excellent mechanical properties. Among the diverse examples are fluorescent lamp bases, street lamp reflectors, pump housings and impellers, filter media, monofilaments, and packaging components.