Long glass fiber fill Polypropylene natural color customized plastic sample provide

What is PP (Polypropylene)?

Polypropylene (PP) is one of the most widely used general-purpose thermoplastics, known for its excellent chemical resistance, low density, good processability, and cost efficiency.

However, standard PP has inherent limitations such as low mechanical strength, poor stiffness, low impact resistance at low temperatures, and high shrinkage during molding.

To meet engineering application requirements, PP is often modified through reinforcement technologies.

What is Long Glass Fiber?

Long glass fiber (LGF) is an inorganic reinforcing material with excellent mechanical strength, heat resistance, corrosion resistance, and electrical insulation properties.

Compared with short glass fiber, LGF typically refers to fibers longer than 10mm, which provide significantly improved load transfer and structural performance in composites.

What is PP-LGF (Long Glass Fiber Reinforced PP)?

PP-LGF is a high-performance composite material made by reinforcing polypropylene with long glass fibers (typically 10–25mm in pellet form).

After injection molding, the fiber length in the final part forms a three-dimensional network structure, significantly enhancing mechanical performance.

This material is also known as LGFPP (Long Glass Fiber Reinforced Polypropylene).

PP-LGF significantly improves stiffness, impact resistance, creep resistance, and dimensional stability compared to standard PP.

Key Advantages of PP-LGF

• High strength-to-weight ratio
• Excellent impact resistance
• Improved stiffness and rigidity
• Excellent creep resistance under load
• Low warpage and good dimensional stability
• Good fatigue performance
• Metal replacement capability in structural parts
• Suitable for complex injection molded components

Why Choose LGF Instead of SGF?

• Longer fiber length enables higher mechanical reinforcement efficiency
• Better impact performance, especially in automotive applications
• Improved fatigue resistance and long-term durability
• Lower warpage and better dimensional accuracy
• Enhanced performance in humid and thermal environments
• Reduced fiber breakage during processing

Applications of PP-LGF

Automotive Industry

Front-end modules, door modules, dashboard structures, pedal systems, battery trays, bumper brackets, underbody shields, cooling fan systems, and sunroof frames. PP-LGF is widely used as a lightweight alternative to metal and reinforced PA materials.

Home Appliance Industry

Washing machine drums, structural brackets, fan components, and air-conditioning systems, replacing metal and short glass fiber reinforced plastics.

Electrical & Electronics

High-precision connectors, relay bases, coil frames, solenoid valve housings, transformer components, and electrical structural parts.

Other Industrial Applications

Power tool housings, pump housings, bicycle components, helmet structures, safety footwear parts, skis, and industrial equipment components.

Material Value Summary

PP-LGF enables lightweight engineering solutions with significantly improved mechanical properties, making it an ideal material for replacing metal and traditional engineering plastics such as PA, ABS, and PPO in structural applications.