PBT Long Glass Fiber for Structural Parts
Long fiber materials are generally divided into two types: long glass fibers and long carbon fibers. PBT (Polybutylene terephthalate) is a high-performance engineering plastic with excellent mechanical properties, chemical resistance, electrical insulation, heat resistance and processing performance.
What is long glass fiber PBT material? Long glass fiber reinforced Polybutylene terephthalate (PBT) composites are a high-performance composite material made by adding longer glass fibers (usually 5-25mm in length, much longer than the 1mm of short glass fibers) to the PBT matrix. The addition of long glass fibers significantly enhances the mechanical strength, impact resistance and fatigue resistance of PBT, while retaining its original chemical resistance, electrical insulation and processing performance, enabling it to withstand higher tests.
Key Advantage of LGF PBT Pellets
High mechanical strength and high rigidity
Significant improvement in tensile/bending strength: Long glass fibers have high mechanical properties
Low anisotropy: Long glass fibers are distributed more evenly, reducing the performance direction differences caused by fiber orientation
Outstanding impact resistance and fatigue resistance
High impact strength: Long glass fibers can effectively absorb and disperse impact energy, and the notched impact strength can reach several times that of short glass fiber PBT
Cyclic load resistance: Suitable for components that are subject to dynamic stress for a long time (such as gears and moving parts), with extended fatigue life.
Environmental adaptability
Weather resistance: Resistant to UV and damp heat aging (stabilizers need to be added), suitable for outdoor equipment.
Low friction and wear: It can be modified for use in sliding components (such as bearings and guide rails).
Excellent heat resistance
Heat distortion temperature (HDT) increase: It can reach over 150°C, suitable for high-temperature environments (such as engine compartment components).
Long-term thermal stability: It can be used for a long time at a fixed temperature with slow performance degradation.
Outstanding dimensional stability
Low shrinkage rate & low warpage: Long glass fibers inhibit resin shrinkage, ensuring high dimensional accuracy after molding and making it suitable for precision structural components.
Strong creep resistance: Small deformation under continuous load (such as industrial gears, bearings)
Lightweight and substitutability
Low density: Lighter than metals, suitable for automotive light weighting (such as door modules, battery brackets).
Design freedom: Complex structures can be formed through injection molding, reducing the number of parts and assembly costs.
Application Range of LGF PBT Compound Resin
Long glass fiber polybutylene terephthalate (PBT) material, due to its inherent excellent properties, can be applied in various fields. For instance, long glass fiber PBT materials play a significant role in automotive light weighting, capable of replacing some metal structural components, reducing weight and enhancing performance.
Automotive industry (Lightweight structural components)
Body structural components: door modules, front end brackets, rear longitudinal beam reinforcing plates, roof frames.
Chassis system: Suspension control arm, steering knuckle, brake pedal bracket.
New energy vehicles: battery pack housing, motor bracket, charging pile shell (flame retardant required).
Interior structural components: Seat frame, dashboard bracket, central aisle reinforcing parts.
Electronic and electrical (high-rigidity structural components)
Large equipment enclosures: server chassis, 5G base station antenna covers, power distribution boxes.
Precision support components: relay frame, sensor bracket, insulating structural components.
Connector housing: High-voltage charging interface, high-speed data transmission module (with stable dimensions required).
Industrial equipment (fatigue-resistant structural components)
Transmission components: industrial gears, pump and valve housings, bearing seats.
Conveying system: Conveyor belt rollers, mechanical arm joints, automated guide rail brackets.
Tools and equipment: electric tool housings (such as electric hammers), agricultural machinery frames.
Household appliances and consumer goods (Durable structural components)
Large household appliance frames: inner drum brackets for washing machines, fan bases for air conditioners, and hinges for refrigerators.
Sports equipment: bicycle pedals, ski bindings, trekking pole joints.
Furniture structural components: folding chair brackets, pulley bases, load-bearing parts of storage cabinets.
Future Development
With the continuous advancement of manufacturing processes, the application scope of long glass fiber polybutylene terephthalate (PBT) composite materials will continue to expand. From the integrated structural components of automobiles to the moving joints of intelligent robots, from micro medical devices to large wind turbine blades, this material is transforming the traditional manufacturing model. In the future, long glass fiber PBT composite materials are expected to achieve more complex structural designs and more efficient production methods, bringing more possibilities to industrial manufacturing. Although there are still challenges in processing technology and cost control, with the maturation of technology and the emergence of scale effects, long glass fiber reinforced materials are bound to shine in more fields and become indispensable key materials in modern manufacturing.
FAQ
Q: Is the electrical insulation of long glass fiber PBT superior to that of PA or PPS material?
A: Yes, the volume resistivity is better than PA pellet, but not as good as PPS material. It has good electrical insulation and is suitable for medium and high voltage electrical components (such as connectors and relays).
Q: What is the chemical resistance of long glass fiber PBT material?
A: It is resistant to weak acids, weak bases, oils and alcohol, but not to strong acids (such as concentrated sulfuric acid) and strong bases (such as sodium hydroxide). It has good stability in gasoline and engine oil and is suitable for automotive fuel circuit components.
Q: What are the special requirements for injection molding machines and molds of long glass fiber PBT materials?
A: Special screws are required (to avoid excessive shearing of glass fiber), wear-resistant die steel, and a large runner design (to reduce flow resistance). The gate size needs to be larger than that of short glass fiber materials.
The long-fiber materials of LFT-G® have opened up new material directions for many fields, and the market is gradually expanding and developing. If you are curious about this material and want to know more related information, you can contact our material experts. Click below,
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