LFT PP LGF50 Composite
What is PP LGF50?
The PP LGF50 material has become increasingly popular in the industry, especially for parts that require high durability and strength. LFT-G® PP LGF50 stands for Polypropylene Long Glass Fiber 50%. This means that the material is made up of 50% long glass fiber and 50% polypropylene. The long glass fibers are what give the material its strength and durability, while the polypropylene provides flexibility and resistance to heat and chemicals.
Long Fiber Reinforced Engineering Plastic Composites LFTPP LGF are 25-35% lighter than steel components of equivalent strength.Uses for LFT materials also include:
- Increased use of plastic/long fiber composites in body panels;
- Long continuous fiber material reinforcement technology for structural components;
- Greater use of long carbon fiber reinforced plastics for parts such as structural components, due to the development of low-cost composites;
- The use of advanced nylon long carbon fibers under the hood, and in the battery car cover.
Twist pultrusion molding is a new technology used to produce LFT pellets. This allows the fiber length to exceed the length of the plastic pellet. It improves mechanical properties.
Compared to the previous standard steel frame, the weight of the automotive parts has been reduced by 51%. The total number of parts consolidation has dropped from 33% to 4%.LFTPP Long Glass Fiber Polypropylene material increases the bending torsional stiffness by 13% compared to long carbon fiber reinforced LFT material. Similarly, it achieved a 25% increase in part breaking force at a 24% lower cost.
Xiamen LFT-G adopts LFT-G ranules cutting process to prepare high melt flow rate PP injection molding pump special material, the product flexural modulus of 1600MPa or more, to meet the customer's design specifications and processing requirements, and has been produced on a large scale.
Key Specifications of PP-LGF50
Optimized for high-stiffness structural parts, LFT-G® PP-LGF50 offers exceptional mechanical properties, delivering a reliable balance of extreme tensile modulus and dynamic toughness.
PP LGF50 vs. Standard PP GF50 (Short Fiber)
Why upgrade from standard PP GF50? Standard short-fiber compounds rely on fractured, tiny glass fragments that fracture under impact loads. In contrast, LFT-G® PP-LGF50 features a continuous 50% long glass fiber loading. During injection molding, these long strands form a highly entangled 3D skeletal network. This structural skeleton distributes mechanical stress evenly, significantly improving crash performance and thermal stability.
Standard Short PP GF50
- Fibers fracture easily under heavy mechanical loads.
- Isotropic shrinkage leads to dimensional warping.
- Higher screw and mold abrasion during plastication.
LFT-G® PP LGF50 (Long Fiber)
- Continuous fiber network (5-25mm pellet).
- Over 2.5x higher impact toughness and durability.
- Low shrinkage (0.1%-0.2%) prevents part deformation.
Typical Material Properties (LFT-PP-LGF50)
Typical values are recorded under DAM conditions at our LFT-G® testing facility. Testing complies with verified ISO standards.
| Property | Test Standard | Value (DAM State) |
|---|---|---|
| Tensile Modulus | ISO 527 | 11,500 MPa |
| Tensile Strength | ISO 527 | 148 MPa |
| Flexural Strength | ISO 178 | 208 MPa |
| Charpy Notched Impact (23°C) | ISO 179 | 45-54 kJ/m² |
| Property | Test Standard | Value |
|---|---|---|
| Density | ISO 1183 | 1.31 g/cm³ |
| HDT (1.80 MPa) | ISO 75 | 159 °C |
| Mold Shrinkage | ISO 294-4 | 0.10 - 0.20 % |
Processing Guidelines – Injection Molding
Pre-drying
90–100°C / 2–4h
Moisture < 0.1%
Injection
Melt 210–250°C
Mold 38–69°C Pressure 80–120 MPa
Application Cases (FAB Method)
Electric Vehicle Battery Pack Frames
EV battery pack frames require extreme flexural stiffness under constant load. The dense 50% continuous fiber skeleton prevents wall deflection and container deformation. This safeguards the internal high-voltage cells from dynamic impacts and mechanical intrusion, ensuring passenger safety .
Automotive Front-End Structural Carriers
LFT-G® PP-LGF50 compound replaces conventional structural steel or die-cast aluminum. It cuts component weight by over 40% while preserving strict dimensional tolerances under cyclical loads . This transition improves vehicle range, cuts assembly costs, and avoids galvanic corrosion issues.
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