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Preliminary datasheet

PBT – Polybutylene terephthalate PBT GF 50

PRECITE® P3 GF 50 black (6925)

PRECITE® P3 GF 50 black (6925) is a 50% glass fibre reinforced, medium viscous poly(butylene terephthalate) (PBT) with very high stiffness and toughness as well as high dimensional and chemical resistance.

Typical applications

Precision parts in automobile and E/E 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.

6Drying time3 - 4 h
Drying temperature100 - 120°C
Processing moisture0,04 - 0,02%
1Feed section60 - 80°C
2Temperature zone 1 - Zone 4250 - 275°C
3Nozzle temperature250 - 280°C
4Melting temperature260 - 275°C
5Mold temperature80 - 100°C
P NachHolding pressure, spec.300 - 800 bar
P StauBack pressure, spec.30 - 100 bar
Injection speedmedium to high
Screw speed8 - 15 m/min

Warning

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.

  • Mechanical Properties
    Tensile modulus (1 mm/min | ISO 527-2)
    d.a.m.17000 MPa
    Stress at break (5 mm/min | ISO 527-2)
    d.a.m.175 MPa
    Flexural modulus (2 mm/min | ISO 178)
    d.a.m.16500 MPa
    Flexural strength (2 mm/min | ISO 178)
    d.a.m.285 MPa
    Charpy impact strength (23°C | ISO 179-1/1eU)
    d.a.m.60 kJ/m²
    Charpy notched impact strength (23°C | ISO 179-1/1eA)
    d.a.m.12 kJ/m²
  • Thermal Properties
    Temperature of deflection under load HDT/A (1,8 MPa | ISO 75)215 °C
    Melting temperature (DSC, 10K/min | DIN EN 11357-1)225 °C
  • Flammability
    Burning rate UL 94 0,8mm Wall thickness (UL 94)HB Class
    GWFI 1,6 mm Wall thickness (IEC 60695-2-12)725 °C
  • General properties
    Density (23°C | ISO 1183)1,71 g/cm³
    Humidity absorption (70°C, 62% r.F. | ISO 1110)0,2 %
    Water absorption 23°C saturated (23°C, saturated | ISO 62)0,4 %
    Molding shrinkage (flow | ISO 294-4)0,2 %
    Molding shrinkage (transverse | ISO 294-4)0,6 %
  • Electrical Properties
    Dieletric strength (3 mm | IEC 60243)425 kV/mm
  • Rheological Properties
    MVR (250°C/2,16kg | ISO 1133)2 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® and ICX® are registered trademarks of the Feddersen Group.

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