PBT is an engineering plastic known for its excellent toughness, fatigue resistance, heat resistance, weather ability, electrical properties, and low water absorption. Reinforced and flame-retardant modified PBT offers enhanced heat resistance, flame retardancy, dimensional stability, and stiffness, making it suitable for automotive, electronics, and electrical industries. In smart appliances, modified PBT meets requirements such as high glow-wire ignition temperature (GWFI/GWIT) and high comparative tracking index (CTI). It is used in capacitor cases, induction cooker coils, rice cooker sockets, micro-switches, timers, and bobbins. Flame-retardant grades are often required, especially for export products. In automotive applications, PBT is used in ignition systems, fuse boxes, connectors, headlamp housings, window supports, door handles, wiper motors, central locking systems, air filters, sensors, fuel pumps, and airbag components. With global automotive production expected to grow at 3.5% annually, demand for modified PBT is likely to increase. Key injection molding parameters include: barrel temperature (240–280°C for unfilled, 230–260°C for glass-filled), mold temperature (affecting crystallinity and warpage), and injection pressure (60–90 MPa for unfilled, 80–100 MPa for reinforced grades).
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