PK – Polyketone PK GF15AKROTEK® PK-VM GF 15 black (8686)
AKROTEK® PK-VM GF 15 black (8686) is a 15% glass fibre reinforced Polyketone with average stiffness and strength. Due to its very good media resistance, the material is suitable for use in applications that carry cooling water.
This type was developed as the successor to PK-VM GF 15 schwarz (5091) in order to meet the requirements for a larger processing window during processing.
Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 4500 MPa
Stress at break (5 mm/min | ISO 527-2) d.a.m. 90 MPa
Strain at break (5 mm/min | ISO 527-2) d.a.m. 4 %
Charpy impact strength (23°C | ISO 179-1/1eU) d.a.m. 50 kJ/m²
Charpy notched impact strength (23°C | ISO 179-1/1eA) d.a.m. 10 kJ/m²
Melting temperature (DSC, 10K/min | DIN EN ISO 11357-3) 220 °C
Burning rate (UL 94) 1,6mm Wall thickness HB Class
Burning rate (<100 mm/min) (> 1 mm Thickness | FMVSS 302) +
Density (23°C | ISO 1183) 1,35 g/cm³
Humidity absorption (70°C, 62% r.H. | ISO 1110) 0,7 - 0,8 %
Molding shrinkage (flow | ISO 294-4) 0,5-0,7 %
Molding shrinkage (transverse | ISO 294-4) 1,1-1,3 %
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 - 260°C|
|Nozzle temperature||230 - 260°C|
|Melt temperature||230 - 260°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|
Polyketones crosslink depending on time and temperature, crosslinking is noticed by an increase of viscosity and/or dark spots in natural colored compounds. The melt temperature should be at or below 260 °C and under no circumstances go beyond 270 °C because crosslinking speed will increase. The residence time in the barrel including the hot runner should not exceed 10 min. If interruptions of more than 10 minutes are expected, the barrel and hot runner need to be purged and cleaned with polyolefins. 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 masterbatches! Crosslinking is noticed by an increase of viscosity and or dark spots in natural colored compounds. In this case purge immediately with polyolefines.
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.