Polyamide 66
Polyamide 66 (also known as Nylon 66) is an engineering thermoplastic with exceptional mechanical strength, heat resistance, and chemical stability. Widely used in automotive, electrical, and industrial applications, Polyamide 66 offers superior performance under demanding conditions.
Technical Specifications
- Chemical Name: Polyamide 66 (PA66)
- Density: 1.14 g/cm³
- Melting Point: 260-265°C
- Tensile Strength: 80-90 MPa
- Flexural Modulus: 2800-3000 MPa
- Impact Strength: 50-80 kJ/m²
| Property | Standard | Value |
|---|---|---|
| Water Absorption (23°C, 50% RH) | ISO 62 | 2.5-3.0% |
| Heat Deflection Temperature (1.8MPa) | ISO 75 | 70-90°C |
| Volume Resistivity | IEC 60093 | 10¹⁴-10¹⁵ Ω·cm |
Key Advantages of Polyamide 66
- Excellent mechanical properties even at elevated temperatures
- Superior chemical resistance against oils, fuels, and solvents
- Good electrical insulation properties
- Exceptional wear resistance and low friction coefficient
- Retains dimensional stability in fluctuating humidity conditions
Frequently Asked Questions About Polyamide 66
What are the main differences between Polyamide 66 and Polyamide 6?
Polyamide 66 has a higher melting point (260°C vs 220°C) and better mechanical properties at elevated temperatures compared to Polyamide 6. While both materials absorb moisture, Polyamide 66 maintains better dimensional stability under humid conditions. The production process for Polyamide 66 is also more complex, resulting in slightly higher costs.
How does temperature affect the performance of Polyamide 66?
Polyamide 66 performs exceptionally well in high-temperature environments. Its heat deflection temperature ranges between 70-90°C at 1.8MPa load, making it suitable for under-the-hood automotive applications. The material retains approximately 50% of its room temperature strength at 150°C. For continuous use, the maximum service temperature is typically around 120-130°C in dry conditions.
What are the most common applications for Polyamide 66?
Polyamide 66 is widely used in automotive components (gears, bearings, radiator end tanks), electrical connectors, industrial gears, and consumer products. Its combination of strength, heat resistance, and electrical properties makes it ideal for demanding applications such as fuel system components, circuit breakers, and power tool housings.
Detailed Physical Properties
| Property | Test Method | Condition | Value |
|---|---|---|---|
| Tensile Strength | ISO 527 | 23°C, dry | 80-90 MPa |
| Tensile Elongation | ISO 527 | 23°C, dry | 15-40% |
| Flexural Strength | ISO 178 | 23°C, dry | 110-130 MPa |
| Notched Impact Strength | ISO 180/1A | 23°C, dry | 5-10 kJ/m² |
Processing Guidelines for Polyamide 66
- Drying: 80-90°C for 4-6 hours (moisture content below 0.2%)
- Injection Molding Temperature: 260-290°C
- Mold Temperature: 60-90°C
- Injection Pressure: 60-100 MPa
- Screw Speed: 50-100 rpm
Safety Information
When processing Polyamide 66, ensure adequate ventilation as decomposition products may include carbon monoxide and nitrogen oxides above 300°C. Use appropriate personal protective equipment including heat-resistant gloves and safety glasses. Store in dry conditions to prevent moisture absorption prior to processing.