This is the premium grade (Model:PP-LGF40AR) reinforces a high-strength 40% Long Glass Fiber skeleton with an advanced Heat Aging Resistance package with homo polypropylene resin.
√ Good aging heat resistance
√ good conductive electrical
√ Excellent Stiffness & Toughness Balance
Standard short-fiber PP GF40 offers good initial strength, but when exposed to continuous heat (100°C+), it suffers from thermal oxidation (embrittlement) and creep (sagging). LFT-G® PP-LGF40AR is the structural answer to these thermal challenges.
This specific grade (Model: NG04AR-Homo) combines the superior rigidity of a Homopolymer PP matrix with a 40% Long Glass Fiber skeleton and a specialized Heat Aging Resistance (AR) package. It is engineered to maintain its high modulus and resist molecular breakdown over thousands of hours in hot environments, making it a lightweight alternative to PA6-GF30 or die-cast metal.
√ Maximum Stiffness (Homo): The Homopolymer base provides higher flexural modulus and tensile strength compared to copolymers, ideal for static structural loads.
√ Long-Term Heat Stability: The AR additives prevent the "chalking" and cracking typical of standard PP under heat stress, extending part life significantly.
√ Anti-Creep at High Temp: The long fiber network mechanically locks the part shape, preventing deformation even near the material's heat deflection limits.
Stiffness Retention at 120°C
Heat softens plastic. See how LFT Homopolymer stands its ground against other PP options.
LowCopo PP GF40
MediumHomo PP GF40
HighLFT-G® LGF40-H
*Comparative Flexural Modulus at Elevated Temperature
Typical Material Properties (Homo/AR Grade)
The following values are typical data for LFT-G® PP-LGF40AR (Homopolymer Heat Stabilized) and are for reference only. Please contact us for the official Technical Data Sheet (TDS).
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)
230 - 270 °C
Mold Temperature (Zone ②)
50 - 80 °C
Back Pressure
Low (to minimize fiber damage)
Case Study: Engine Cooling Fan Shroud
The Challenge: Heat + Vibration
A heavy-duty truck manufacturer used standard PP GF40 for fan shrouds. However, radiant heat from the engine (up to 120°C) combined with road vibration caused the parts to warp and crack at the mounting points within just 6 months.
The Solution: LFT-G® LGF40AR (Homo)
They upgraded to LFT-G® PP-LGF40AR. The Homopolymer base provided superior stiffness to resist warping, while the Heat Aging Resistance (AR) package prevented thermal degradation. The long fiber skeleton effectively dampened the vibrations.
Result
The part passed a rigorous 3,000-hour heat aging test with zero failures. It offered a 30% weight reduction compared to the PA66 alternative and significantly lower material costs.
Applications for High-Heat Structural PP
Engine Beauty Covers
Replaces expensive PA6. With AR stabilization, LFT Homopolymer PP resists the radiant heat of the engine block for years without discoloration or brittleness, maintaining a premium look.
Industrial Heater Housings
For blowers and space heaters. The high stiffness of the Homopolymer LGF40 skeleton prevents the housing from warping in the hot air stream, ensuring safety and efficiency.
Coffee Machine Frames
Supports the boiler and pump. Must withstand internal heat and pressure without creeping. LFT-G® LGF40AR provides a rigid, food-safe, and heat-resistant structural chassis.
People Also Ask (Google PAA)
1. What is the heat deflection temperature of PP GF40?
A: For LFT-G® PP-LGF40AR (Homopolymer), the Heat Deflection Temperature (HDT) is approximately 160°C at 1.8 MPa load. This is significantly higher than standard copolymer PP, making it suitable for structural applications in high-temperature environments like engine compartments.
2. Why use Homopolymer PP instead of Copolymer for heat resistance?
A: Homopolymer PP has a higher crystalline content than Copolymer. This natural structure gives it superior stiffness (modulus) and heat resistance. If your part needs to support a load in a hot environment without sagging, Homopolymer (like our LGF40-Homo grade) is the correct engineering choice.
3. How long does PP last in heat ("Heat Aging")?
A: Unstabilized PP degrades rapidly above 100°C. However, Heat Stabilized grades like LFT-G® LGF40AR use special antioxidants to prevent molecular breakdown. This allows the material to retain its mechanical strength and ductility for thousands of hours at continuous service temperatures of 120°C - 140°C.
Ready to Beat the Heat?
Ensure long-term structural durability in high-temperature environments with LFT-G® PP-LGF40AR. Contact our material specialists today to discuss your project or request a sample.
Standard short-fiber PP GF40 offers good initial strength, but when exposed to continuous heat (100°C+), it suffers from thermal oxidation (embrittlement) and creep (sagging). LFT-G® PP-LGF40AR is the structural answer to these thermal challenges.
