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Material Overview
What is PBT GF30?
PBT GF30 is a 30% glass-fiber-reinforced grade of polybutylene terephthalate (PBT), engineered for applications that demand higher stiffness and reduced deformation under load than unfilled PBT can provide. The glass fiber reinforcement significantly increases flexural modulus, reduces creep, and improves dimensional stability at elevated temperatures, while the semi-crystalline PBT matrix retains its inherent electrical insulation and moisture resistance.
The combination of glass reinforcement and PBT's low moisture uptake makes PBT GF30 especially suited to structural and electrical components that must maintain precise geometry and reliable insulation performance in variable environments. Chemical resistance to common oils, fuels, and industrial fluids is retained from the base resin.
Typical applications include reinforced electrical connector housings, precision relay bases, structural brackets requiring dimensional control at elevated service temperatures, and automotive components where stiffness-to-weight ratio matters. PBT GF30 is commonly selected when unfilled PBT creeps or deforms under sustained load at service temperature.
Ready Plastics stocks PBT GF30 in rod and plate for machined components. For lower stiffness or improved impact toughness, see the unfilled PBT grade. Contact Ready Plastics for available dimensions and to request a quote.
Frequently Asked Questions
PBT GF30, answered
What is PBT GF30?
PBT GF30 is polybutylene terephthalate reinforced with 30% glass fiber. The reinforcement significantly increases stiffness, reduces creep under load, and improves dimensional stability at elevated temperatures compared to unfilled PBT, while preserving the base resin's good electrical insulation and low moisture absorption.
When should I choose PBT GF30 instead of unfilled PBT?
Choose PBT GF30 when your application requires higher stiffness, better resistance to creep under sustained load, or improved dimensional stability at elevated temperatures. Unfilled PBT is preferred when impact toughness, easier machining, or lower cost is the priority.
Is PBT GF30 harder to machine than unfilled PBT?
Glass-fiber-filled grades are more abrasive than unfilled thermoplastics and will wear tooling faster. Carbide cutting tools are recommended for PBT GF30. With proper tooling, good surface finishes and tight tolerances are achievable.
What shapes does Ready Plastics stock in PBT GF30?
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