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Preliminary datasheet

PBT/PET Compound PBT-PET- GF 30

PRECITE® K GF 30 4 ECO black (8699)

PRECITE® K GF 30 4 ECO black (8699) is a 30% glass fibre reinforced, hydrolysis stabilised PBT/PET blend with high strength. Due to its low moisture absorption, this material is particularly suitable for precision parts in the automotive, E&E or appliances industries. The formulations of the sustainable ECO products are partly based on regenerated post-consumer feedstock and thus contribute to reducing the consumption of valuable raw materials.


Tensile Modulus
Tensile Strength
Impact Strength


reduced moisture
recycled content
CO₂eq reduced
sports & leisure
hydrolysis/ chemically stabilised
  • Mechanical Properties

    Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 9500 MPa

    Stress at break (5 mm/min | ISO 527-2) d.a.m. 120 MPa

    Strain at break (5 mm/min | ISO 527-2) d.a.m. 3 %

    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. 17 kJ/m²

  • Thermal Properties

    Melting temperature (DSC, 10K/min | DIN EN ISO 11357-3) 252 °C

  • General properties

    Density (23°C | ISO 1183) 1,47 g/cm³

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

    Molding shrinkage (flow | ISO 294-4) 0,2 - 0,4 %

    Molding shrinkage (transverse | ISO 294-4) 0,7 - 0,9 %

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) 120 - 140°C

Processing moisture ≤ 0,02%

1 Feed section 60 - 80°C

2 Temperature zone 1 - Zone 4 260 - 280°C

3 Nozzle temperature 260 - 290°C

4 Melt temperature 270 - 280°C

5 Mold temperature 80 - 100°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


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.


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.

Application examples

PRECITE® PBT - Precision to Detail


More about PRECITE®