What is PA66 CF?
PA66 CF20 (carbon fibre reinforced polyamide 66, 20% fibre content) – very high stiffness and heat deflection temperature combined with good wear resistance and dimensional stability
Technical data
| Property | Value | Test method |
|---|---|---|
| General Properties | ||
| Density | 1.23 g/cm³ | DIN EN ISO 1183-1 |
| Water absorption (24 h / 96 h, 23 °C) | 0.1 / 0.3 % | DIN EN ISO 62 |
| Flammability | HB (UL 94) | DIN IEC 60695-11-10 |
| Mechanical Properties | ||
| Tensile strength | 104 MPa | DIN EN ISO 527-2 |
| Elongation at yield | 12 % | DIN EN ISO 527-2 |
| Elongation at break | 13 % | DIN EN ISO 527-2 |
| Tensile modulus | 5100 MPa | DIN EN ISO 527-2 |
| Flexural strength | 135 MPa | DIN EN ISO 178 |
| Flexural modulus | 4300 MPa | DIN EN ISO 178 |
| Compressive strength (1% / 2% / 5% compression) | 16 / 33 / 89 MPa | EN ISO 604 |
| Impact strength (Charpy, unnotched) | 116 kJ/m² | DIN EN ISO 179-1eU |
| Shore hardness | 83 (scale D) | DIN EN ISO 868 |
| Thermal Properties | ||
| Glass transition temperature | 48 °C | DIN EN ISO 11357 |
| Melting temperature | 251 °C | DIN EN ISO 11357 |
| Service temperature, long term | 100 °C | Average |
| Service temperature, short term (max.) | 170 °C | Average |
| Thermal conductivity | 0.72 W/(m·K) | ISO 22007-4:2008 |
| Coefficient of linear thermal expansion (23–60 °C, longitudinal) | 9 .10-5/K | DIN EN ISO 11359-1;2 |
| Electrical Properties | ||
| Surface resistivity | 104 … 1012 Ω | DIN EN 61340-2-3 |
| Volume resistivity | 103 … 1012 Ω·cm | DIN EN 61340-2-3 |
PA66 CF in detail
1What is PA66 CF?+
PA66 CF is a polyamide 66 reinforced with around 20% carbon fibre. The carbon fibres significantly increase stiffness and strength compared with unreinforced PA66 – the tensile modulus is 5100 MPa, more than double that of standard PA66. At the same time, the material stays comparatively light, wear-resistant and easy to machine. The carbon-fibre-filled finish is black.
2How is PA66 CF machined at Liedtke?+
PA66 CF mills, turns and drills well on standard machine tools. The carbon fibre filling makes the material more abrasive to machine than unreinforced PA66 – sharp, wear-resistant tooling and good extraction of the fine, conductive fibre dust are recommended. Being a hygroscopic polyamide, the stock should be conditioned before machining to avoid dimensional deviations from moisture absorption.
3When should I choose PA66 CF?+
PA66 CF is a good fit when high stiffness and dimensional stability are needed together with low weight – for example for highly loaded functional parts, bearing and guide elements with good wear resistance, or components that need a higher heat deflection temperature than standard PA66. The electrically conductive carbon fibres also make the material interesting for antistatic applications.
4What determines the price of a PA66 CF part?+
PA66 CF is priced above standard polyamides due to the carbon fibre reinforcement. Part price is mainly determined by stock shape and size, material utilisation (offcuts), machining effort and batch size. We are happy to quote binding prices on request based on your drawing.
5When is PA66 CF not the right choice?+
If transparency or a light colour is required, PA66 CF is not suitable – the carbon fibre always gives the material a black finish. For lower stiffness requirements, unreinforced PA 6 or PA 6 G is often the more economical choice. For use in aggressive chemicals or at continuous service temperatures well above roughly 100 °C, other materials such as PEEK or PPS are better suited.
6Advantages and disadvantages of PA66 CF+
An honest assessment. Advantages: very high stiffness and strength at low weight, good wear resistance, high dimensional stability, good weldability and bondability, resistant to many oils, greases and fuels, electrically dissipative. Disadvantages: higher material cost than standard PA66, more abrasive to machine, available only in black, hygroscopic like all polyamides.
Typical properties
- Very high stiffness
- Good wear resistance
- High heat deflection temperature
- High dimensional stability
- Good weldability and bondability
- Resistant to many oils, greases and fuels
Typical industries
- Mechanical and plant engineering
- Automotive industry
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