What is PBT-GF30?
PBT-GF30 denotes a glass fiber-reinforced grade of polybutylene terephthalate (PBT), incorporating 30% short glass fibers into the polymer matrix.
This semi-crystalline thermoplastic polyester achieves strong interfacial bonding between the fibers—typically 0.2-0.4 mm in length—and the PBT resin. The reinforcement preserves inherent PBT traits such as chemical resistance and ease of processing while substantially improving mechanical strength, rigidity, and dimensional stability.
This composition positions PBT-GF30 as a prevalent engineering plastic for demanding structural and electrical applications.
Performance Comparison
Pure PBT
- • Excellent electrical insulation
- • High chemical resistance
- • Low moisture absorption
- × Limited mechanical strength
- × Susceptible to creep
PBT GF30 Improvements
- • Tensile strength enhanced by 2-3x
- • Flexural modulus enhanced by 2-3x
- • HDT: 60°C → 200°C+
- • Superior dimensional stability
- • Modest density rise (1.53 g/cm³)
Trade-offs
- • Property anisotropy (orientation-based)
- • Potential surface fiber exposure
- • Reduced flow vs. unreinforced
| GF Content | Key Characteristics | Typical Application Contexts |
|---|---|---|
| GF10 | Moderate rigidity, superior flow and surface finish | Components prioritizing aesthetics |
| GF20 | Balanced strength and processability, cost-effective | Standard electrical connectors |
| GF30 | Optimal strength-rigidity-cost equilibrium; excellent dimensional stability | Automotive structural parts, electrical housings (primary selection) |
| GF40+ | Elevated rigidity but potential reduced toughness and flow | High-load precision components |
Increased GF loading amplifies mechanical performance at the expense of toughness and processing ease. PBT-GF30 strikes an effective balance, enabling practical benefits such as lightweight yet durable automotive components.
Material Grades
Commercial PBT-GF30 grades vary by color, flame retardancy, and targeted modifications. Suppliers such as BASF (Ultradur® series), DuPont (Crastin®), Celanese (Vandar®), and SABIC (Valox®) offer formulations aligned with specific requirements.
Other Specialized Grades:
- Hydrolysis-resistant for humid conditions.
- Food-contact compliant per FDA/EU standards.
- Low-warpage for controlled shrinkage.
- Laser-weldable with tailored transmittance.
A Comprehensive Guide to PBT-GF30: Properties, Applications, and More.
This resource provides extended coverage of mechanical and thermal properties, industry applications, manufacturing considerations, and future trends.
