1. Definition and Characteristics

What is long-fiber-reinforced thermoplastic composite? LFT is a composite material made with a thermoplastic resin matrix and glass or carbon fibers, typically ranging in length from 5–25 mm. Compared to short-fiber-reinforced thermoplastics (SFT), LFT exhibits superior mechanical properties and durability. Its key characteristics are as follows:

High strength and high rigidity: Long fibers transfer stress more efficiently, improving the mechanical properties of the composite.

Excellent impact resistance: Increased fiber length improves the fracture toughness of the material.

Lightweight: Low density makes it suitable for partial metal replacement.

Processing flexibility: It can be formed into complex structures through processes such as injection molding and compression molding.

2. Advantages

Balanced performance: It combines high strength, heat resistance, and processability.

Lightweight solutions: It is widely used in applications requiring weight reduction, such as automotive and aviation.

Great design freedom: It is suitable for the production of complex three-dimensional structures.

Recyclability: It is more easily recyclable than thermoset composites.

3. Application Scenarios

Automotive Industry: Lightweight components such as bumpers, front-end frames, seat frames, and engine hoods.

Electronic and Electrical Equipment: Battery trays, structural components, and housings.

Industrial Equipment: High-strength, impact-resistant structural parts.

Sports Equipment: Bicycle components and protective sports gear.

4. Selection Guide

Matrix Resin: Commonly used are PP (polypropylene), PA (nylon), and PBT. The choice is based on heat resistance and mechanical properties.

Fiber Type: Mainly glass fiber reinforced, with carbon fiber being used for high performance requirements.

Fiber Content: Generally 20–60%. A higher content increases strength but also increases processing difficulty.

Production Process: Injection molding is suitable for high-volume production, while compression molding is suitable for large structural parts.

5. FAQ

What is the difference between LFT and SFT?

LFT has longer fibers (5–25 mm), providing greater strength and toughness. SFT, generally less than 1 mm, has lower performance but is easier to process.

Can LFT completely replace metal?

In some automotive and electronic structural parts, LFT can replace steel or aluminum, but metal is still required under extremely high-load conditions.

Can LFT be recycled?

Yes. As a composite material with a thermoplastic matrix, LFT can be recycled and reused through remelting.

6. Summary

Long fiber-reinforced thermoplastic composites (LFT) are advanced materials that combine lightweighting, high strength, and good processability. They are increasingly used in automotive, electronics, industrial equipment, and other fields, providing important solutions for future green manufacturing and lightweight design. We are a Chinese glass fiber manufacturer. If you are looking for glass fiber chopped strands for thermoplastic resins, our products are a good choice. For more information, please contact us by email at annayu@169chem.net or WhatsApp: +8618909016373.