PBT GF30 (30% Glass Fiber) Properties — Complete Engineering Data Sheet (2026)
Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026
Published: 2026-06-10
PBT GF30 is the dominant material for automotive electrical connectors, relays, and switches. Its key advantage: fast crystallization enables the shortest cycle times of any reinforced engineering thermoplastic.Propprose Processability Score...
Technical Properties
| Density | 1.53 g/cm³ |
|---|---|
| Tensile Strength | 135 MPa |
| Melting Point | 225 °C |
| Shrinkage Rate | 0.2-0.5% |
| Flexural Modulus | 9 GPa |
| Hdt | 205 °C at 1.82 MPa |
| Continuous Service Temp | 120 °C |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| BASF Ultradur B4300 | |
| SABIC Valox 420 | |
| DuPont Crastin |
Frequently Asked Questions
Why is PBT preferred over PA66 for automotive connectors?
PBT has lower moisture absorption (0.1% vs 2.5% for PA66), which means stable dimensions and electrical properties in humid environments. PBT also crystallizes faster, enabling shorter cycle times. PA66 wins on heat resistance (250°C HDT vs 205°C) and cost. The choice depends on whether the connector will see continuous high temperature (PA66) or moisture/humidity (PBT).
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org