Introduction
With the rapid advancement of the "Four New Trends" (lightweighting, electrification, intelligence) in the automotive industry, engineering plastics are undergoing an unprecedented performance innovation. Among numerous metal replacement solutions, PP Long Glass Fiber Reinforced Material (PP-LGF) has become the preferred material for automotive structural components and interior functional parts due to its excellent specific strength, fatigue resistance and unique potential for "plastic metallization".
As an enterprise deeply engaged in this field, Jurong Best Composite Materials Co., Ltd. produces PP-GF30, PP-GF40 and PP-GF50 series products, which precisely cover the full-scenario demands from secondary load-bearing structural parts to high-rigid skeleton parts.
I. Gear Shift Lever Base: The Game of High Rigidity and Creep Resistance
Application Scenario
The gear shift lever base is located in the central channel of the vehicle. It not only bears the driver's shifting force but also fixes the complex electronic shift mechanism. The traditional metal base is heavy and prone to NVH problems.
Material Solution: PP-GF40
In this application, PP-LGF material with 40% glass fiber content is a cost-effective choice. Compared with PP-GF30, PP-GF40 has a flexural modulus usually above 6000MPa, providing higher deformation resistance.
Cases and Effects
A mainstream joint-venture automaker switched the base to PP-GF40 in its updated model. Results show that in thermal cycle tests from -35C to 85C, PP-GF40 not only maintains stiffness similar to nylon but also reduces costs by about 20%-25%. A single part weight reduction of over 15% is achieved.
II. Engine Cover: A Long Battle in a High-Temperature Environment
Application Scenario
The engine cover is located in the core area of the engine compartment, exposed to hot air, oil vapor and high temperatures (120-140C for a long time). Its core demands are long-term thermal aging resistance and dimensional stability.
Material Solution: PP-GF30
Although PP-GF30 is a general reinforced grade, special thermal oxidative stabilization modification is essential for applications around the engine. The three-dimensional network structure formed by long glass fiber PP-GF30 makes its high-temperature fatigue strength at 120C twice that of ordinary glass fiber reinforced PP.
Cases and Effects
The engine decorative cover of a European model adopts PP-LGF30 to replace aluminum. The effect is remarkable: in addition to a weight reduction of over 40%, LGF material significantly reduces the transmission of engine high-frequency vibration to the cab.
III. Sunroof Guide Rail: The Ultimate Pursuit of Lightweight and Dimensional Accuracy
Application Scenario
Panoramic sunroof guide rails usually span the roof, with extremely high requirements for linear expansion coefficient and rigidity. Traditional metal guide rails are not only heavy but also have cumbersome processing procedures and high costs.
Material Solution: PP-GF50
50% glass fiber content is the "ceiling" level in PP reinforcement, designed for extreme rigidity demands. The flexural modulus of PP-GF50 can usually reach over 10000MPa. This enables the slender and thin-walled sunroof guide rail to maintain straightness under alternating high and low temperatures.
Cases and Effects
A flagship SUV adopts PP-LGF50 to replace aluminum sunroof guide rails. It not only achieves a single part weight reduction of 30% but also integrates multiple metal brackets into the injection-molded part, reducing assembly processes by 5 steps.
Summary
| Grade | Characteristics | Applications | |-------|----------------|--------------| | PP-GF30 | All-purpose grade, balanced heat resistance | Engine peripheral covers, interior structural parts | | PP-GF40 | Best alternative to nylon, medium-to-high strength | Gear shift lever bases, structural parts | | PP-GF50 | Ultra-high rigidity for replacing steel | Sunroof guide rails, front-end modules |
As automotive lightweighting demand changes from recommended to mandatory, the application boundary of long glass fiber PP materials in automotive structural parts is constantly expanding.