PBT – Polybutyleneterephthalate PBT GF 30
PRECITE® P3 GF 30 natural (6850)
PRECITE® P3 GF 30 natural (6850) is a 30% glass fibre reinforced, medium viscous polybutylene terephthalate (PBT) with high stiffness and toughness as well as high dimensional stability and chemical resistance.
Technical and precision parts in automobile, industrial, E/E and appliances industry.
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||3 - 4 h|
|Drying temperature (τ ≤ -30°C)||100 - 120°C|
|Processing moisture||0,02 - 0,04%|
|Feed section||60 - 80°C|
|Temperature zone 1 - Zone 4||250 - 275°C|
|Nozzle temperature||250 - 280°C|
|Melt temperature||260 - 275°C|
|Mold temperature||80 - 100°C|
|Holding pressure, spec.||300 - 800 bar|
|Back pressure, spec.||30 - 100 bar|
|Injection speed||medium to high|
|Screw speed||8 - 15 m/min|
Due to hydrolysis sensitivity of polyesters, a careful drying of the material before processing is very important. High residual moisture contents causes, in addition to surface defects, a decomposition of the molecular chains and thus reduced mechanical properties. If there are longer interruptions of the process, the cylinder temperature should be lowered. Furthermore, we recommend a thorough cleaning of the screw cylinder with extended dwell time or a material change. Glass-fiber-reinforced polyolefins (PE, PP) have established a particularly good cleaning effect.
Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 10000 MPa
Stress at break (5 mm/min | ISO 527-2) d.a.m. 145 MPa
Strain at break (5 mm/min | ISO 527-2) d.a.m. 3 %
Flexural modulus (2 mm/min | ISO 178) d.a.m. 10500 MPa
Flexural strength (2 mm/min | ISO 178) d.a.m. 230 MPa
Charpy impact strength (23°C | ISO 179-1/1eU) d.a.m. 65 kJ/m²
Charpy notched impact strength (23°C | ISO 179-1/1eA) d.a.m. 11 kJ/m²
Temperature of deflection under load HDT/A (1,8 MPa | ISO 75) 205 °C
Melting temperature (DSC, 10K/min | DIN EN 11357-1) 225 °C
Density (23°C | ISO 1183) 1,53 g/cm³
Humidity absorption (70°C, 62% r.H. | ISO 1110) 0,2 %
Water absorption 23°C saturated (23°C, saturated | ISO 62) 0,4 %
Molding shrinkage (flow | ISO 294-4) 0,3 %
Molding shrinkage (transverse | ISO 294-4) 0,9 %
Volume resistivity (IEC 60093) d.a.m. >1,0E+13 Ohm x cm
Surface resistivity (acc. to IEC 60093) d.a.m. 1,0E+12 Ohm
Comparative tracking index (Test liquid A | IEC 60112) 400 V
MVR (250°C/2,16kg | ISO 1133) 9 cm³/10min
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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