PK – Polyketone PK
AKROTEK® PK-VM natural (4774)
AKROTEK® PK-VM natural (4774) is an unreinforced Polyketon with high flowability.
Typical applications
Mainly components in mechanical engineering and the automotive industry.
Processing information
The listed values are recommendations. Higher values should be used for higher glass loadings. We recommend only de-humidifying or vacuum dryers. Extensive drying can cause filling problems and surface defects.
 | Drying time | 0 - 4 h |
| Drying temperature (τ ≤ -30°C) | 80°C | |
| Processing moisture | 0,02 - 0,1% | |
 | Feed section | 60 - 80°C |
 | Temperature zone 1 - Zone 4 | 220 - 250°C |
 | Nozzle temperature | 230 - 250°C |
 | Melting temperature | 230 - 250°C |
 | Mold temperature | 60 - 120°C |
 | Holding pressure, spec. | 300 - 800 bar |
 | Back pressure, spec. | 30 - 70 bar |
| Injection speed | medium to high | |
| Screw speed | 8 - 15 m/min | |
Warning
The molding machine needs to be purged with polyolefines before and after processing of AKROTEK® PK! There is a risk of cross linking caused by reactions with POM or PA as well as unsuitable master batches! Cross linking is visible through dark spots! In this case purge immediately with polyolefines.
- Mechanical Properties
Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 1500 MPa conditioned 1500 MPa Stress at yield (50 mm/min | ISO 527-2) d.a.m. 60 MPa conditioned 60 MPa Strain at break (50 mm/min | ISO 527-2) d.a.m. > 200 % conditioned > 200 % Flexural modulus (2 mm/min | ISO 178) d.a.m. 1900 MPa conditioned 1500 MPa Flexural strength (2 mm/min | ISO 178) d.a.m. 70 MPa conditioned 70 MPa Charpy impact strength (23°C | ISO 179-1/1eU) d.a.m. n.b. conditioned n.b. Charpy impact strength (-30°C | ISO 179-1/1eU) d.a.m. n.b. Charpy notched impact strength (23°C | ISO 179-1/1eA) d.a.m. 10 kJ/m² conditioned 10 kJ/m² Charpy notched impact strength (-30°C | ISO 179-1/1eA) d.a.m. 3,5 kJ/m² - Thermal Properties
Temperature of deflection under load HDT/A (1,8 MPa | ISO 75) 100 °C Temperature of deflection under load HDT/B (0,45 MPa | ISO 75) 190 °C Melting temperature (DSC, 10K/min | DIN EN 11357-1) 220 °C Coefficent of linear thermal expansion, parallel (23°C bis 80°C | ISO 11359-1/2) 1,11 1,0E-4/K Coefficent of linear thermal expansion, transverse (23°C bis 80°C | ISO 11359-1/2) 1,11 1,0E-4/K - Flammability
Burning rate (UL 94) 1,6mm Wall thickness HB Class Burning rate (<100 mm/min) (> 1 mm Thickness | FMVSS 302) + - General properties
Density (23°C | ISO 1183) 1,24 g/cm³ Humidity absorption (70°C, 62% r.F. | ISO 1110) 0,8 - 0,9 % Molding shrinkage (flow | ISO 294-4) 1,4 - 1,6 % Molding shrinkage (transverse | ISO 294-4) 1,5 - 1,7 % - Electrical Properties
Volume resistivity (IEC 60093) d.a.m. 1,0E+13 Ohm x cm conditioned 1,0E+10 Ohm x cm Surface resistivity (acc. to IEC 60093) d.a.m. 1,0E+13 Ohm conditioned 1,0E+10 Ohm Comparative tracking index (Test liquid A | IEC 60112) 600 V - Rheological Properties
MVR (240°C/2,16kg | ISO 1133) 60 cm³/10min
Disclaimer
All specifications and information given on this website are based on our current knowledge and experience. A legally binding promise of certain characteristics or suitability for a concrete individual case cannot be derived from this information. The information supplied here is not intended to release processors and users from the responsibility of carrying out their own tests and inspections in each concrete individual case. AKRO®, AKROMID®, AKROLEN®, AKROLOY®, AKROTEK®, ICX® and PRECITE® are registered trademarks of the Feddersen Group.
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