LFT-G® PP LGF40YD | The Hydrolysis-Resistant PP GF40 for Pumps
LFT-G® 40% Long glass fiber PP (Copo)
LFT-G® PP-LGF40YD is a specialized engineering composite designed specifically for fluid handling applications. While standard PP GF40 (short fiber) is often used for basic housings, it frequently fails in pumps due to "creep" under hydrostatic pressure and fatigue from pulsation.
This specific grade, LGF40YD, combines a 40% long glass fiber skeleton with a chemically resistant Copolymer PP matrix tailored for hydrolysis resistance. It bridges the gap between standard plastics and expensive metals like brass or stainless steel, offering a lightweight, corrosion-proof solution that maintains tight tolerances in hot, wet environments.
- √ Hydrolysis & Chemical Resistance: Engineered to resist degradation from hot water, chlorinated pool water, and harsh industrial chemicals better than PA66 or metals.
- √ Zero Dimensional Creep: The long-fiber network locks dimensions in place, preventing leaks in pump housings and ensuring impellers maintain optimal clearance.
- √ Cavitation Resistance: The tough Copolymer base absorbs the microscopic impacts of fluid cavitation better than brittle short-fiber materials, extending part life.
Typical Material Properties (Pump Grade)
The following values are typical data for LFT-G® PP-LGF40YD (Pump/Water Grade) and are for reference only. Please contact us for the official Technical Data Sheet (TDS).
Mechanical Properties
| Property | Test Method | Value |
|---|---|---|
| Tensile Modulus | ISO 527 | 8,900 MPa |
| Tensile Strength | ISO 527 | 129 MPa |
| Tensile Strain at Break | ISO 527 | 2.8 % |
| Flexural Modulus | ISO 178 | 8,600 MPa |
| Notched Izod Impact (23°C) | ISO 180/A | 55 kJ/m² |
| Notched Izod Impact (-30°C) | ISO 180/A | 35 kJ/m² |
Thermal & Physical Properties
| Property | Test Method | Value |
|---|---|---|
| Density | ISO 1183 | 1.20 g/cm³ |
| HDT/A (1.8 MPa) | ISO 75 | 159°C |
| HDT/C (8.0 MPa) | ISO 75 | 140 °C |
| Melting Temperature | ISO 11357 | ~163 °C |
| Mold Shrinkage (Flow) | ISO 294-4 | 0.2 - 0.4 % |
Processing Information
The following values are recommendations. We recommend desiccant / dry air dryers (moisture content below 0.1%).
To minimize fiber breakage and ensure optimal performance, a low-compression, general-purpose screw is highly recommended.
| Parameter | Recommendation |
|---|---|
| Drying Temperature | 80 - 100 °C |
| Drying Time | 2 - 4 hours |
| Melt Temperature (Nozzle ③) | 220 - 260 °C |
| Mold Temperature (Zone ②) | 40 - 80 °C |
| Back Pressure | Low (to minimize fiber damage) |
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