When selecting nylon materials for engineering applications, PA6 and PA66 are the two most common choices. While both belong to the polyamide family, their different molecular structures lead to distinct property profiles that can significantly impact your product’s performance.
Molecular Structure: The Key Difference
The fundamental difference between PA6 and PA66 lies in their chemical structure. PA6 (Polycaprolactam) is made from a single monomer—caprolactam—with six carbon atoms per repeat unit. PA66 (Polyhexamethylene adipamide) is made from two monomers—hexamethylene diamine and adipic acid—each contributing six carbons to the repeat unit.
This structural difference affects crystallinity, melting point, and ultimately the material’s mechanical and thermal properties.
機械的特性の比較
| プロパティ | PA6 | PA66 |
|---|---|---|
| 引張強さ (MPa) | 70-85 | 80-95 |
| 破断伸度（%） | 50-150 | 30-60 |
| 曲げ弾性率 (GPa) | 2.5-3.0 | 2.8-3.3 |
| Notched Izod Impact (kJ/m²) | 5-15 | 4-8 |
熱的特性
PA66 has a higher melting point (approximately 260°C vs 220°C for PA6) and better heat deflection temperature.
連続使用温度
- PA6: 80-100°C
- PA66: 100-120°C
水分吸収
Both PA6 and PA66 are hygroscopic materials, meaning they absorb moisture from the environment. However, PA6 typically absorbs moisture faster due to its lower crystallinity.
Processing Differences
PA6 has a wider processing window and lower processing temperature requirements, making it easier to mold. PA66 requires more precise temperature control and higher processing temperatures.
処理パラメータ
- PA6 Melt Temperature: 230-280°C
- PA66 Melt Temperature: 270-300°C
- PA6 Mold Temperature: 40～80°C
- PA66 Mold Temperature: 60-100°C
Cost Considerations
PA6 is typically 10-20% less expensive than PA66 on a per-kilogram basis.
アプリケーションに関する推奨事項
Choose PA6 When:
- 耐衝撃性は極めて重要である
- コストに対する感応度が高い
- Processability and cycle time matter
- Parts will not be exposed to high temperatures
Choose PA66 When:
- High temperature resistance is required
- Stiffness and strength are priorities
- Dimensional stability under load matters
- Parts will be used in demanding environments
当社の能力
を超える。 300台のCNCマシン, を生産している。 毎日10,000個 という厳しい公差で ±0.005mm. .我々は受け入れる 1個からのMOQ, 納期は以下の通り。 24時間～15日間. 24時間以内にお見積もりいたします。.
よくあるご質問
How do you know whether PA6 vs PA66: Which Nylon Grade Is Right for Your Application? fits a part?
PA6 vs PA66: Which Nylon Grade Is Right for Your Application? fits a part when its load capacity, temperature range, moisture exposure, wear behavior, and processing method match the real service conditions.
What properties should be checked for PA6 vs PA66: Which Nylon Grade Is Right for Your Application??
強度、剛性、耐衝撃性、耐熱性、吸湿性、寸法安定性、摩擦、摩耗、および化学的適合性を確認する。.
What is the biggest selection risk for PA6 vs PA66: Which Nylon Grade Is Right for Your Application??
最大のリスクは、実際の使用環境、加工方法、部品の形状、および長期使用を考慮せずに、データシートの数値だけで選定してしまうことです。.
When should PA6 vs PA66: Which Nylon Grade Is Right for Your Application? be tested before production?
部品が荷重、熱、化学物質、湿気、厳しい公差、規制要件、あるいは新たな動作環境にさらされる場合は、試験を行うことをお勧めします。.
