PA66-LCF50: Ultra Reinforced Long Carbon Fiber Polyamide 66 for Maximum Load and Thermal Resistance

PA66-LCF50 is a top tier polyamide 66 (PA66) composite reinforced with 50% long carbon fiber (LCF), engineered for critical structural applications demanding metal like strength, superior thermal stability, and long term dimensional control. With half of its weight made up of high strength continuous fibers, PA66-LCF50 pushes thermoplastic performance to the extreme—delivering unmatched rigidity, fatigue resistance, and thermal endurance for advanced engineering systems.

The long carbon fiber reinforcement creates a densely interconnected matrix that efficiently transfers load, resists warping, and minimizes mechanical failure under cyclical or sustained stress. PA66-LCF50 excels in structural elements that must maintain tight tolerances and high performance under severe thermal, mechanical, and environmental conditions.

Key Mechanical Properties

Tensile Strength: ≥ 175 MPa

Flexural Strength: ≥ 230 MPa

Notched Impact Strength: ≥ 14 kJ/m²

With 50% LCF content, PA66-LCF50 achieves mechanical strength and stiffness approaching lightweight metals like aluminum, while still offering weight savings and corrosion resistance. The long fiber reinforcement significantly increases fatigue life and toughness under bending, torsion, and shock loading.

Thermal and Chemical Resistance

Heat Deflection Temperature (HDT): Approx. 150°C

Long-Term Service Temperature: Up to 140°C

Chemical Resistance: Excellent against oils, greases, fuels, and weak acids/alkalis; not compatible with strong oxidizers or concentrated acids

Even in sustained high heat environments, PA66-LCF50 maintains mechanical properties with minimal degradation. This makes it ideal for under the hood vehicle components, industrial machinery near heat sources, and enclosures exposed to thermal cycling.

Wear Resistance and Processability

Wear Resistance: Exceptional – supports high load bearing, sliding, and impact motion

Processing Methods: Injection molding (using LCF capable feeders), compression molding

Processing Notes: Use low shear settings, hardened steel molds, and controlled fill speeds to preserve fiber length and optimize dispersion

Despite its high reinforcement content, PA66-LCF50 remains processable with adapted tooling. The long fibers enhance surface durability and drastically reduce creep and deformation over time, particularly under stress or vibration.

Environmental Stability

Water Absorption: Significantly lower than unreinforced PA66

Dimensional Stability: Excellent in fluctuating thermal and humidity conditions

Thanks to the dense carbon fiber reinforcement, PA66-LCF50 exhibits minimal moisture uptake, excellent dimensional consistency, and resistance to warping or swelling—critical for precision components and outdoor or humid environments.

Typical Applications

PA66-LCF50 is engineered for maximum structural efficiency, making it an ideal replacement for metals in lightweighting strategies across sectors like:

Automotive:

Structural engine supports and brackets

Hybrid plastic metal composite assemblies

High stiffness mounts and reinforcements

Industrial:

High load mechanical joints and linkages

Fatigue resistant components in automated machinery

Wear resistant housings and frames

Electronics & Appliances:

Rugged enclosures for heavy duty electronics

Internal frames in high vibration equipment

Structural supports with thermal and dimensional reliability

PA66-LCF50 Performance Summary