Hardened Tooling Steel Selection and Injection Shrinkage Tolerances
Verify tool steel composition and heat treatment phase stability independently to ensure injection shrinkage predictions match finished part tolerances.
PBT-GF30
Meaning
Structural thermoplastic compounds consisting of polybutylene terephthalate reinforced with thirty percent glass fiber by weight provide high stiffness, electrical insulation and dimensional stability for precision industrial components. The material exhibits low moisture absorption compared to polyamide resins, retaining mechanical properties and electrical performance in humid operating environments. Molders process the compound within tight temperature windows to avoid polymer degradation while ensuring uniform fiber distribution.
Applications include automotive electrical connectors, relay housings and precision structural frames.
Material Characteristics
Combining polyester resin with thirty percent glass reinforcement produces superior creep resistance and thermal endurance. Molded parts made from PBT-GF30 maintain tight dimensional tolerances due to minimal moisture expansion and low thermal expansion coefficients. High dielectric strength makes the compound ideal for high-voltage electrical enclosures.
Processing Mechanics
Thermoplastic processing requires precise melt temperature controls and high injection speeds to achieve smooth surface finishes. Drying PBT-GF30 prior to molding eliminates moisture that causes microstructural polymer degradation during melting. Tooling incorporates hardened steel components to resist fiber-induced abrasive wear over extended production runs.
Quality Inspection
Dimensional validation verifies part compliance against engineering drawings following tool shrinkage cooling. Laboratory testing of PBT-GF30 parts evaluates tensile strength and impact resistance to ensure fiber-matrix adhesion meets design specifications. Non-destructive testing confirms the absence of internal void formation in heavy wall sections.