LFT POLYAMIDE 6 Nylon Reinforced long glass fiber orginal color for automotive parts

What is PA6 (Nylon 6)?

PA6 (Polyamide 6), commonly known as Nylon 6, is a semi-crystalline thermoplastic engineering plastic containing amide groups (-CONH-) in its molecular backbone. It is one of the most widely used engineering polymers in the world.

PA6 is produced from caprolactam and is available in various grades including PA6, PA66, PA610, etc., depending on the monomer structure. Among them, PA6 and PA66 are the most commonly used in industrial applications.

PA6 offers excellent mechanical strength, wear resistance, and processability, making it widely used in fibers, engineering plastics, and films.

Properties of PA6

PA6 provides a balanced combination of mechanical and chemical performance, including:

• High tensile and compressive strength
• Excellent toughness and fatigue resistance
• Good wear and abrasion resistance
• Strong resistance to oils, fuels, and most organic solvents
• Good electrical insulation properties
• Easy processing and good moldability

However, PA6 also has some limitations such as high moisture absorption, dimensional instability, and reduced impact performance at low temperatures.

Limitations of PA6

• High water absorption affects dimensional stability
• Poor UV resistance and long-term thermal oxidation behavior
• Property variation under humid environments
• Processing sensitivity to moisture content

Why Reinforce PA6 with Long Glass Fiber?

To overcome the limitations of neat PA6, reinforcement with long glass fibers (LGF) is widely used. This is a common physical modification method to significantly enhance material performance.

By incorporating long glass fibers into the PA6 matrix, the following properties are greatly improved:

• Mechanical strength and stiffness
• Dimensional stability
• Heat resistance
• Fatigue performance
• Load-bearing capability

Applications of PA6-LGF

30% long glass fiber reinforced PA6 is widely used in high-performance structural components, including:

Power tools: housings and structural parts
Automotive industry: engine components, structural brackets, interior and exterior parts
Industrial equipment: mechanical parts and housings

Its fatigue strength can reach up to 2.5× higher than unreinforced PA6, making it ideal for demanding applications.

Processing Guidelines (PA6-LGF 30%)

The addition of 30% long glass fiber significantly reduces shrinkage to approximately 0.3%, compared to 1.0–1.5% for neat PA6. Higher fiber content generally leads to lower shrinkage, but may also increase surface fiber exposure and processing challenges.

Recommended processing notes:

• Recycled material usage should be controlled within 25%
• Material must be properly dried before processing
• Excessive reprocessing may affect mechanical performance and color stability
• Mold design should consider fiber orientation and flow balance
• Post-cooling in warm water helps reduce warpage and internal stress

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