What is LFT-G® Nylon MXD6 GF40?
Description
LFT-G® Nylon MXD6 GF40 is a high-performance long glass fiber reinforced polyamide that combines the low moisture absorption of semi-aromatic MXD6 resin with 40% long glass fiber technology. It delivers exceptional creep resistance, metal-like stiffness, and superior surface aesthetics, making it ideal for structural components exposed to elevated temperatures and fluctuating humidity.
Characteristic
🔧 Engineered for Strength & Durability
- Ultra-high tensile strength & modulus
- Superior notched impact resistance
- Low creep under continuous load
- Exceptional dynamic fatigue endurance
🔥 Reliability Under Heat & Humidity
- High heat deflection temperature (HDT >230°C)
- Minimal moisture absorption, stable in wet conditions
- Near-isotropic shrinkage for extreme flatness
- Compatible with vibration welding & secondary assembly
Fiber Architecture: The Long View
🔍 Micro-Image Validation:
📏 Resin length >6 mm
Unlike short-fiber compounds (1–3 mm), MXD6 LGF40 retains fiber length above 6 mm after injection. This creates an entangled 3D network that distributes stress far more effectively - crack propagation is arrested, not just deflected.
🧱 Skeletal Reinforcement
The long fibers form a "skeleton" that reduces anisotropic shrinkage. Warpage drops by 60% compared to short-fiber MXD6 GF40. Parts behave more like isotropic materials, enabling tighter tolerances.
Processing Guidelines
To ensure optimal performance and minimize fiber breakage during the injection molding of LFT-G® MXD6- GF40, follow these recommended processing steps and parameters:
| Parameter | Recommended Range | Key Notes for MXD6 LGF40 |
| Drying Temperature ① | 90 – 110 °C | Use a desiccant/dry air dryer to avoid hydrolysis |
| Drying Time ① | 3 – 4 hours | Ensure uniform moisture removal before processing |
| Melt Temperature (Nozzle) ③ | 210 – 240 °C | Avoid overheating to preserve fiber integrity |
| Mold Temperature ② | 40 – 60 °C | Balances flowability and part dimensional stability |
| Injection Speed | Slow to Moderate | Minimize fiber breakage and internal shear |
Critical Tips：
Screw: Low-compression screw to reduce fiber breakage
Gating: Generous gating for smooth material flow
Case study: E-Motor Controller Cover
The Challenge
Initial prototypes using short-fiber MXD6 GF40 exhibited severe warpage exceeding 3.5 mm, causing IP67 sealing failures and assembly misalignment. The anisotropic shrinkage of short fibers created dimensional instability at mounting points, while weld-line weakness led to cracking during thermal cycling from -40°C to 150°C. Engineers needed a material solution that could match aluminum's flatness while enabling reliable vibration welding.
The Solution
LFT-G® MXD6 GF40 was implemented with optimized gate geometry to preserve fiber length and promote uniform distribution. The long glass fiber architecture created a three-dimensional reinforcement network that bridged weld lines and reduced anisotropic shrinkage by over 60%. Mold temperature control at 130°C enhanced crystallinity, while low-shear processing maintained residual fiber length above 1.2 mm throughout the complex geometry.
The Result
Flatness achieved: warpage reduced by 72% (from 3.5 mm to <0.9 mm)
Sealing certified: IP67 passed on first attempt, no tool modification required
Weight savings: 35% lighter than die-cast aluminum (1.8 kg saved per cover)
Thermal endurance: survived 1,000 thermal shock cycles (-40°C to +150°C) without cracks
Strength boost: burst strength increased 45% vs. short-fiber MXD6 GF40
FAQ
Q: What is the difference between MXD6 and PA6?
A: MXD6 is a semi-aromatic polyamide with high stiffness, low moisture absorption (~2.5%), and excellent dimensional stability. PA6 is an aliphatic nylon valued for impact resistance, processing ease, and higher moisture absorption (~6-8%). The right choice depends on your application priorities.
Q: Does LFT-G® MXD6 GF40 require special drying before processing?
A: Yes. LFT-G® MXD6 GF40 is hygroscopic and must be predried at 100°C for 4 hours before molding. Proper drying prevents surface defects and ensures consistent mechanical properties in finished parts.
Q: What are the ideal applications for LFT-G® MXD6 GF40?
A: LFT‑G® MXD6 GF40 is widely used in structural automotive components, e-motor controller housings, industrial gears, and metal replacement parts that demand high heat resistance, dimensional stability, and long-term reliability under continuous load.
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