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PBT – Polybutyleneterephthalate PBT

PRECITE® P1 black (7935)

PRECITE® P1 black (7935) an unreinforced polybutylene terephthalate (PBT) with low viscosity and good dimensional stability. It is particularly suitable for precision parts in the automotive, E&E or appliances industries.

Properties

Tensile Modulus
Tensile Strength
Impact Strength

Features

easy flow
reduced moisture
E&E
industrial
household
sports & leisure
  • Mechanical Properties

    Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 2700 MPa

    Stress at yield (50 mm/min | ISO 527-2) d.a.m. 60 MPa

    Strain at yield (50 mm/min | ISO 527-2) d.a.m. 10 %

    Flexural modulus (2 mm/min | ISO 178) d.a.m. 2600 MPa

    Flexural strength (2 mm/min | ISO 178) d.a.m. 90 MPa

    Charpy impact strength (23°C | ISO 179-1/1eU) d.a.m. n.b.

    Charpy notched impact strength (23°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) 55 °C

    Melting temperature (DSC, 10K/min | DIN EN ISO 11357-3) 223 °C

  • Flammability

    Burning rate 5V (UL 94)
    0,8mm Wall thickness HB Class

    Burning rate (<100 mm/min) (> 1 mm Thickness | FMVSS 302) +

  • General properties

    Density (23°C | ISO 1183) 1,31 g/cm³

    Humidity absorption (70°C, 62% r.H. | ISO 1110) 0,1-0,3 %

    Water absorption 23°C saturated (23°C, saturated | ISO 62) 0,4-0,6 %

    Molding shrinkage (flow | ISO 294-4) 1,7-1,9 %

    Molding shrinkage (transverse | ISO 294-4) 1,8-2,0 %

  • Rheological Properties

    MVR (250°C/2,16kg | ISO 1133) 50 cm³/10min

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.


6 Drying time 3 - 4 h

Drying temperature (τ ≤ -30°C) 100 - 120°C

Processing moisture 0,02 - 0,04%

1 Feed section 60 - 80°C

2 Temperature zone 1 - Zone 4 240 - 270°C

3 Nozzle temperature 240 - 280°C

4 Melt temperature 250 - 270°C

5 Mold temperature 60 - 80°C

P Nach Holding pressure, spec. 300 - 800 bar

P Stau Back pressure, spec. 30 - 100 bar

Injection speed medium to high

Screw speed 8 - 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.

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.