Chemical Structure Differences
The fundamental difference between PA6 (Nylon 6) und PA66 (Nylon 66) lies in their molecular structure:
- Nylon 6: Made from caprolactam, has 6 carbon atoms in each repeating unit. Less crystalline structure.
- Nylon 66: Made from hexamethylenediamine and adipic acid, has two 6-carbon chains. More crystalline structure.
Mechanical Properties Comparison
| Eigentum | PA6 | PA66 |
|---|---|---|
| Zugfestigkeit | 70-85 MPa | 80-100 MPa |
| Biegemodus | 2.5-3.0 GPa | 2.8-3.5 GPa |
| Dehnung beim Bruch | 30-100% | 15-60% |
| Notched Izod Impact | 50-100 J/m | 40-80 J/m |
| Schmelzpunkt | 220°C | 260°C |
| HDT at 1.8 MPa | 70°C | 90°C |
Feuchtigkeitsabsorption
Moisture absorption is critical for nylon applications:
| Condition | PA6 | PA66 |
|---|---|---|
| At 50% RH | 2.5-3.0% | 2.0-2.5% |
| Saturation | 8-10% | 6-8% |
Processing Characteristics
Nylon 6 Processing
- Melting Point: 220°C
- Processing Range: 240-280°C
- Mold Temperature: 40-80°C
Nylon 66 Processing
- Melting Point: 260°C
- Processing Range: 280-320°C
- Mold Temperature: 60-90°C
Applications by Material
Nylon 6 Applications
- Gears and sprockets
- Industrial monofilament
- Film and packaging
- Consumer products
Nylon 66 Applications
- Automotive under-hood components
- Electrical connectors
- High-temperature bearings
- Precision mechanical components
Reinforced Grades
Both materials are commonly reinforced with glass fiber:
| Klasse | PA6 + GF30 | PA66 + GF30 |
|---|---|---|
| Zugfestigkeit | 140-160 MPa | 170-200 MPa |
| HDT (1.8 MPa) | 205°C+ | 250°C+ |
| Feuchtigkeitsabsorption | 1.0-1.5% | 0.8-1.2% |
Selection Summary
Choose Nylon 6 when:
- Impact resistance is critical
- Cost sensitivity is high
- Operating temperatures are moderate
Choose Nylon 66 when:
- Higher mechanical strength is required
- Elevated temperatures are expected
- Dimensional stability is critical
Frequently Asked Questions
Is Nylon 66 stronger than Nylon 6?
Yes. Nylon 66 typically offers 15-25% higher tensile strength due to more crystalline structure.
Which nylon is better for gears?
Both work well. PA6 is preferred for impact-loaded gears due to higher toughness. PA66 is better for high-load, high-temperature gear applications.
Where can I source quality PA6 and PA66?
Nylonplastic supplies both grades in natural, colored, and reinforced versions. Contact us for samples.
Nylon 6 vs Nylon 66 — Frequently Asked Questions
Is Nylon 66 stronger than Nylon 6?
Yes. Nylon 66 typically offers 15-25% higher tensile strength (80-100 MPa vs 70-85 MPa) due to more crystalline structure.
Which nylon is better for gears?
Both work well. PA6 is preferred for impact-loaded gears due to higher toughness. PA66 is better for high-load, high-temperature applications.
Where can I source quality PA6 and PA66 granules?
Nylonplastic supplies both grades in natural, colored, and reinforced versions. Contact us for samples.
