Extreme Rigidity & Metal Replacement: The Power of PP LGF50 Compounds
For mechanical designers developing heavy-duty structural parts, high-loading glass filled polymers are essential. Standard short-fiber options like PP GF50 or PA6 GF50, while stiff, are extremely brittle and suffer from severe surface floating fibers, anisotropy warp, and rapid mold wear. LFT-G® PP LGF50 completely redefines part engineering limits. By encapsulating a dense 50% concentration of continuous glass fibers through advanced pultrusion technology, we establish an internal 3D structural skeleton. This network offers a flexural modulus exceeding 10,000 MPa, allowing for direct replacement of die-cast metals and heavy nylons. Upgrade your components to PP LGF50 to eliminate weight and warping while retaining superior high-impact energy absorption.
Key Specifications (PP LGF50 Ultra-Rigid Grade)
Typical Material Properties (LFT-PP-LGF50-NG05)
The physical values detailed below represent typical metrics recorded inside the LFT-G® Polymer Characterization Facility under Dry-As-Molded (DAM) conditions. Testing complies strictly with verified ISO and ASTM standards to ensure absolute technical data verification.
Mechanical Testing Profile
| Property | Test Standard | Value (DAM State) |
|---|---|---|
| Tensile Strength | ISO 527 | 147 MPa |
| Tensile Modulus | ISO 527 | 11,900 MPa |
| Flexural Strength | ISO 178 | 208 MPa |
| Flexural Modulus | ISO 178 | 11,200 MPa |
| Notched Izod Impact | ISO 180 | 46 kJ/m² |
Thermal & Physical Analysis
| Property | Test Standard | Value |
|---|---|---|
| Density | ISO 1183 | 1.34 g/cm³ |
| HDT (0.45 MPa) | ISO 75 | 159 °C |
| HDT (1.80 MPa) | ISO 75 | 155 °C |
| Mold Shrinkage | ISO 294-4 | 0.10 - 0.20 % |
Processing Guidelines – Injection Molding
Pre-drying
85–95°C / 2–4h
Moisture < 0.1%
Injection
Melt 215–245°C
Mold 50–80°C Pressure 90–130 MPa
Tooling
Low-compression screw
Full round runners (Ø5–6mm) L/D 18:1–22:1
Multi-Industry Application Cases
Heavy-Duty Cooling Fan Blades & Shrouds
Large-scale cooling fans running at high RPM experience intense centrifugal force and continuous environmental aging. LFT-G® PP LGF50 replaces aluminum cast blades, saving up to 35% in weight while maintaining structural creep stability under high desert temperatures, optimizing motor efficiency.
Automotive Bumper Beams & Front-End Carriers
Bumper reinforcements require extreme stiffness under normal loads and high ductility under crash impact. The dense 50% long glass fiber overlapping network enables parts to absorb crash energy progressively through fiber pullout rather than brittle shattering, outperforming short glass compounds.
EV Battery Enclosure End Plates
Modern electric vehicle battery packs need end plates with high flexural resistance to restrain battery cell expansion. PP LGF50 matches the structural stiffness of cast aluminum end plates, while providing integral electrical insulation and chemical resistance against electrolyte fluids.
Field Proven Case Study
Challenge
A major cooling tower equipment manufacturer struggled with industrial axial fan blades made of cast aluminum and glass fiber reinforced plastic (FRP). The aluminum blades were heavy, difficult to balance, and expensive. The FRP alternative required manual lay-up, causing slow cycle times, high labor costs, and severe quality variations.
Solution
The manufacturer transitioned to high-pressure injection molding utilizing LFT-G® PP-LGF50-BG05. The 3D continuous fiber network delivered the mechanical rigidity needed for high rotational forces while allowing high-speed automated cycle production.
Results
✅ 35% weight reduction (reducing centrifugal load on motor bearings)
✅ 30% reduction in system costs (eliminating secondary balancing and hand lay-up)
✅ Zero deformation & blade creep (tested at 3000 RPM under heat)
✅ Outstanding chemical resistance (resistant to chemical sprays and moisture)
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