Why choose GF30 PA66 to use in engineering plastic?
2025-09-15
Introduction
Polyamide 66 resin pellets, also known as PA66 material, are a widely used raw material for engineering plastics. Due to their excellent mechanical properties, high-temperature resistance, and wear resistance, they are widely used in the automotive, electrical, and machinery industries.
However, PA66 alone faces limitations in practical applications due to its insufficient rigidity, poor dimensional stability, and significant sensitivity to temperature and humidity. To meet the growing demand for engineering plastics, fillers are often mixed with PA66 to improve its performance. Glass fiber is a common and effective method. "GF30 PA66," or 30% glass fiber-reinforced PA66, is a common material on the market.
However, PA66 alone faces limitations in practical applications due to its insufficient rigidity, poor dimensional stability, and significant sensitivity to temperature and humidity. To meet the growing demand for engineering plastics, fillers are often mixed with PA66 to improve its performance. Glass fiber is a common and effective method. "GF30 PA66," or 30% glass fiber-reinforced PA66, is a common material on the market.
Why PA66 engineering plastic material need Glass fiber reinforced?
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Enhancement of mechanical strength and rigidity: glass fiber, as a high-strength material, can significantly increase the tensile strength and flexural modulus of PA66, enabling it to meet the needs of structural and load-bearing parts.
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Improvement of dimensional stability: PA66 material tends to swell and deform when it absorbs water, while the introduction of glass fibers reduces the dimensional changes caused by water absorption.
- Improved heat resistance: The heat deflection temperature (HDT) of the material can be increased significantly after glass fiber reinforcement, enabling it to maintain its mechanical properties at high temperatures.
| PA66 grade | Material attribution |
Heat distortion temperature
(at 1.8MPa)
|
| Celanese Zytel FR50 NC010 | GF25 | 240℃ |
| BASF A3EG6 | GF30 | 250℃ |
| Envalior Durethan AKV30 | GF30 | 250℃ |
| Celanese Zytel 70G33HS1L NC010 | GF33 | 252℃ |
| Celanese Zytel 101L NC010 | General grade | 70℃ |
| Asahi Kasei Leona1300S | General grade | 70℃ |
| Ascend Vydyne 21SPC | General grade | 70℃ |
| INVSITA U4820L NC01 | General grade | 66℃ |
⚠️From the left table, we can see that due to the glass fiber reinforced polyamide 66, its high temperature resistance is greatly improved. The heat deformation temperature of 30% glass fiber reinforced polyamide 66 in the 1.8MPa test environment can reach 250℃, which is higher than that of unreinforced PA66 material. However, after exceeding the critical value of 30%, the improvement of PA66's high temperature resistance will decrease, so it is necessary to rationally choose the glass fiber filling content.
If you need to know more about PA66 materials, or need other grades of polyamide, please contact us
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Extended service life: Glass fiber reinforcement improves the creep and fatigue resistance of the material, allowing parts to remain stable under long-term loads and vibrations.
Why is GF30 PA66, not is other fillers?
- Compared to mineral fillers (e.g. talc, calcium carbonate)
- Mineral fillers mainly improve dimensional stability and reduce shrinkage, but have limited improvement in mechanical strength.
- Glass fiber reinforcement not only improves rigidity, but also significantly increases strength and heat resistance, making it more suitable for load-bearing parts.
- Compared to carbon fiber reinforcement
- Carbon fiber reinforcement provides higher strength and lower coefficient of thermal expansion, but is expensive and difficult to process.
- Glass fiber reinforcement is more cost-effective and better suited for high-volume applications.
- Compared to lubricating fillers (e.g. molybdenum disulfide, PTFE)
- Lubricating fillers mainly improve friction properties and wear resistance, but do not significantly improve strength.
- Glass fiber reinforcement is more suitable for parts that require structural strength, while lubricating fillers are often used as a secondary modification in conjunction with GF reinforcement.
Why is GF30 PA66, not other ratios?
The glass fiber content of glass fiber reinforced PA66 can be 10-60%, but in actual industrial use, GF30 PA66 is a more common choice because it can achieve the best balance in terms of performance, processing and cost.
- Peoformance of mechanical properties
Although glass fiber reinforcement can effectively improve the rigidity and dimensional stability of PA66 materials, the higher the better is not necessarily true. The common ratio is GF30 PA66. Too low a glass fiber content (<20%) does not significantly improve the rigidity and dimensional stability of PA66 materials and cannot meet the application scenarios with higher requirements. Too high a glass fiber content (>40%) leads to excessive rigidity of PA66 materials, increased brittleness of the material, low fluidity, increased processing difficulty, and serious mold loss.
- Production cost
GF30 PA66 material has a high cost-effectiveness and a significant performance improvement. When the filling amount exceeds 30%, the performance improvement effect of nylon 66 will be significantly reduced. At the same time, in conventional application scenarios, 30% glass fiber filling can already meet application requirements.
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