PLA (Polylactic Acid) PLA, also known as polylactic acid, is a biodegradable and environmentally friendly polymer. Its production process is pollution-free, and the material can naturally degrade, making it one of the most representative green plastics. The structure of PLA has a significant impact on its heat resistance, toughness, mechanical strength, degradability, and biocompatibility. Among these, heat resistance is a key limitation. PLA molecular chains contain only one methylene group, forming a spiral structure with low chain mobility. As a result, PLA exhibits slow crystallization during injection molding, leading to low crystallinity and poor heat resistance. Additionally, during thermal processing, ester bonds may break, generating terminal carboxyl groups that accelerate thermal degradation through autocatalysis. LGF Reinforced PLA Long fiber reinforcement significantly enhances the performance of PLA. Fibers act as a structural skeleton within the polymer matrix, restricting molecular chain movement under heat and thereby improving thermal resistance. Various fibers can be used for PLA reinforcement, including: Natural plant fibers (sisal, flax, bamboo, coconut fiber, wood fiber) Animal fibers (silk) Mineral fibers (basalt fiber) Synthetic fibers (carbon fiber, glass fiber) Among these, carbon fiber and glass fiber are widely applied due to their high strength and modulus, while natural fibers are gaining attention for their sustainability and biodegradability. Studies show that reinforced PLA composites can achieve a Vicat softening temperature exceeding 140°C, significantly improving thermal performance compared to pure PLA. Comparison with Short Fiber (SGF) Compared to short fiber reinforced materials, long glass fiber (LGF) composites offer superior mechanical performance: 1–3 times higher toughness 50–100% increase in tensile strength and stiffness Better suitability for large structural parts Injection Molding Laboratory Warehouse Certifications Xiamen LFT Composite Plastic Co., Ltd. Xiamen LFT Composite Plastic Co., Ltd. specializes in long fiber reinforced thermoplastics (LFT & LFRT), including Long Glass Fiber (LGF) and Long Carbon Fiber (LCF) materials. Our materials are suitable for injection molding, extrusion (LFT-G), and direct molding (LFT-D). Fiber lengths can be customized from 5–25 mm according to customer requirements. Our products are manufactured using advanced continuous fiber impregnation technology and are certified under ISO9001 and IATF16949 systems, with multiple patents and registered trademarks.

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 Customers & Production Certifications