LFT-G® PP GF50 (Model: LFT-HPP-LGF50-NG05) is a high-performance 50% long glass fiber reinforced polypropylene composite designed for extreme structural applications requiring maximum stiffness and durability. Produced via pultrusion technology, this material integrates continuous glass fibers within the resin matrix, delivering significantly higher impact strength and creep resistance compared to conventional short fiber PP GF50. It serves as an ideal lightweight alternative to die-cast metals and expensive engineering plastics like PA66 GF30.
Why Choose LFT-G® 50% Long Fiber PP Over Short Fiber?
In the world of reinforced thermoplastics, fiber length is the critical factor determining performance. While standard "PP GF50" contains chopped fibers (typically < 0.5mm), LFT-G® pellets contain fibers equal to the pellet length (10mm-12mm). This structural difference creates a skeletal network inside the molded part, unlocking capabilities that short fibers simply cannot match.
For engineers seeking to replace metal components, our LFT-HPP-LGF50-NG05 grade offers specific advantages:
- ● Unmatched Stiffness and Strength: With a 50% glass fiber loading, this grade provides exceptional flexural modulus, making it suitable for load-bearing parts that must not bend under stress.
- ● Superior Creep Resistance: Under constant load, short fiber materials tend to deform over time. The entangled long fiber network in LFT-G® resists this deformation, ensuring dimensional accuracy over the product's lifespan.
- ● High Impact Energy Absorption: Even at -30°C, the long fiber structure inhibits crack propagation, preventing catastrophic failure in crash-relevant automotive components.
- ● Low Warpage: High fiber content usually leads to warpage in short fiber materials. However, the long fibers in LFT-G® provide isotropic shrinkage control, ensuring flat, precise parts even with large surface areas.
The Economics of Metal Replacement
LFT-G® PP LGF50 is frequently used to replace aluminum and magnesium die-cast parts. With a density of approximately 1.34 g/cm³, it is roughly half the weight of aluminum (2.7 g/cm³). By switching to LFT-PP, manufacturers can reduce part weight by 30-40% while eliminating secondary operations such as deburring, painting, and anti-corrosion treatments, resulting in a total system cost reduction of up to 20%.
Performance Data: LFT-G® LGF50 vs. Standard PP GF50
| Property | Standard Short PP GF50 | LFT-G® PP LGF50 |
|---|---|---|
| Fiber Structure | Dispersed, Chopped (< 0.5mm) | Skeletal Network (10-12mm) |
| Tensile Strength | ~130 MPa | 155 - 165 MPa |
| Notched Impact Strength | Low (~12 kJ/m²) | High (45 - 48 kJ/m²) |
| Warpage Risk | High | Extremely Low |
Target Applications: Where Stiffness Meets Durability
Automotive Front End Modules
Replaces steel/aluminum brackets. LFT-G® LGF50 provides the necessary rigidity to support headlights, radiators, and hood latches while reducing vehicle weight.
Instrument Panel Carriers
Complex, large integrated parts that require high dimensional stability. Our material prevents warping and supports the weight of electronics and airbags.
Industrial Pump Housings
Offers excellent chemical resistance and withstands high internal pressure. A cost-effective alternative to stainless steel in water treatment applications.
Injection Molding Processing Guide for LGF50
Processing 50% glass fiber reinforced polypropylene requires attention to detail to preserve the fiber length in the final part. While LFT-G® pellets are compatible with standard injection molding machines, the following parameters are recommended to maximize mechanical performance:
- ● Nozzle & Gate Design: Use open nozzles and generous gate sizes (min 2mm-3mm) to reduce shear stress and fiber breakage during injection.
- ● Screw Speed: Maintain a low to medium screw rotation speed (RPM) to gently plasticize the material. High shear will degrade the fiber length.
- ● Back Pressure: Keep back pressure as low as possible (0.2 - 0.5 MPa) to minimize fiber attrition while ensuring consistent dosing.
People Also Ask (FAQ)
Q: How does LFT-G® PP LGF50 compare to Aluminum for structural parts?
A: It is a lighter, more cost-effective alternative. LFT-G® PP LGF50 offers a density of ~1.34 g/cm³, which is significantly lighter than Aluminum (~2.7 g/cm³). While metal has higher absolute stiffness, LFT-PP offers a higher specific strength-to-weight ratio, corrosion resistance, and the ability to mold complex shapes in a single step, eliminating the need for secondary machining.
Q: Is 50% glass fiber content difficult to process?
A: No, if parameters are adjusted. Despite the high glass content, LFT-G® pellets are designed with excellent flow properties. The key is to minimize fiber breakage by using low back pressure and low screw speeds. The material flows well into thin-walled sections due to the high pressure capability of the polypropylene matrix.
Q: Can LFT-G®PP GF50 replace PA66 GF30 (Nylon)?
A: Yes, in many applications. LFT-G® PP GF50 often matches or exceeds the strength of conditioned PA66 GF30. The major advantage is moisture resistance; unlike Nylon, PP does not absorb water, ensuring that mechanical properties and dimensions remain stable regardless of humidity, all at a typically lower material cost.
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