Glass Fiber Reinforced PBT – GF45

Glass Fiber Reinforced PBT – GF45

Maximum Stiffness and Structural Reliability for Heavy-Duty Applications  

PBT GF45 represents the upper performance tier of glass fiber reinforced PBT materials. By incorporating 45% high-modulus glass fibers, this grade achieves exceptional rigidity, dimensional stability, and long-term mechanical reliability under high stress and elevated temperatures.

Compared with GF25 or GF30 grades, GF45 is specifically engineered for metal replacement applications where stiffness, structural integrity, and thermal endurance are critical. It is widely used in automotive structural frames, electrical support components, and industrial parts that must maintain shape and strength throughout extended service life.

Material Composition & High Glass Fiber Reinforcement Structure

PBT GF45 is produced through precision compounding that ensures uniform dispersion of chopped glass fibers throughout the PBT matrix. The dense fiber network forms a continuous load-bearing structure, significantly increasing modulus and reducing deformation under load.

Material Composition Overview

• Base Polymer: Polybutylene Terephthalate (PBT)

• Reinforcement: 45% chopped glass fiber

• Fiber Type: High-modulus E-glass

• Optional Additives:

  • Heat stabilizer

  • Flame retardant (UL94 V2 / V0)

  • Impact modifier

  • UV stabilizer

• Color Options: Natural, black, custom colors

This high fiber loading positions GF45 as a true structural engineering material rather than a general-purpose plastic.

Core Advantages: Extreme Structural Performance

Engineering Advantages

Ultra-High Rigidity

The 45% glass fiber content dramatically increases flexural modulus, allowing parts to resist bending and deformation under heavy loads.

Outstanding Load-Bearing Capability

GF45 maintains structural integrity in applications where lower GF grades may creep or distort.

High Heat Resistance

Elevated heat deflection temperature enables stable performance in under-hood automotive and industrial environments.

Excellent Dimensional Stability

Glass fiber reinforcement minimizes thermal expansion and creep over long service periods.

Chemical & Fluid Resistance

The PBT matrix resists oils, fuels, greases, and automotive fluids.

Manufacturing & Commercial Advantages

Metal Replacement Potential

GF45 enables weight reduction and design freedom compared to aluminum or steel parts.

Long-Term Reliability

Designed for continuous mechanical stress and thermal cycling.

Consistent Injection Molding Quality

Despite high reinforcement, GF45 can be molded reliably with proper gate and mold design.

Proven Use in Demanding Industries

Widely adopted in automotive and industrial structural applications.

Typical Application Areas

Automotive Structural Applications

• Structural brackets

• Reinforcement frames

• Motor and transmission supports

• Under-hood load-bearing components

GF45 is selected where maximum stiffness and heat resistance are required.

Electrical & Power Systems

• Structural supports for contactors

• High-load electrical housings

• Power distribution components

Maintains insulation stability under mechanical stress.

Industrial & Mechanical Components

• Equipment frames

• Load-bearing housings

• Heavy-duty mechanical parts

Ideal for replacing metal in demanding industrial designs.

Processing Performance & Injection Molding Guidelines

Due to its high fiber content, PBT GF45 requires optimized processing conditions and mold design.

Typical Processing Parameters

• Melt Temperature: 260–280°C

• Mold Temperature: 90–130°C

• Drying: 120°C for 3–4 hours

• Injection Speed: Medium

• Shrinkage: 0.1–0.3% (directional)

Proper gate placement and fiber orientation control are essential for optimal performance.

OEM / ODM Customization Capabilities

PBT GF45 can be customized to meet extreme application requirements.

Customization Options

• Glass fiber content: GF30 / GF40 / GF45 / GF50

• Flame retardant grades (UL94 V2 / V0)

• Heat-stabilized formulations

• Improved toughness versions

• Color customization

OEM Support Services

• Structural material selection support

• Metal replacement consulting

• Prototype validation and testing

• Stable long-term supply

Technical Specification – PBT GF45

FAQ

Q1: What is the main advantage of PBT GF45?
It provides ultra-high rigidity, load-bearing strength, and heat resistance for extreme structural applications.

Q2: How does PBT GF45 compare to GF25 or GF30?
GF45 offers significantly higher stiffness and structural performance, suitable for metal replacement, while GF25 and GF30 focus on moderate structural strength.

Q3: Is PBT GF45 suitable for metal replacement?
Yes. Its high modulus and strength make it ideal for replacing metal components.

Q4: Can flame-retardant versions be supplied?
Yes. UL94 V2 and V0 grades are available upon request.

Q5: Can the glass fiber content be customized?
Yes. Glass fiber loading can be adjusted to meet specific mechanical and cost requirements.