PET – Polyethyleneterephthalate PET GF 40PRECITE® E GF 40 natural (7304)
PRECITE® E GF 40 natural (7304) is a 40% glass fibre reinforced, medium viscous polyethylene terephthalate (PET) with high stiffness and toughness even at elevated temperatures. Due to its low moisture absorption, this material is particularly dimensionally stable and therefore perfectly suitable for precision parts in the automotive, E&E and household goods industries, where a very good sureface finish is required.
Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 15000 MPa
Stress at break (5 mm/min | ISO 527-2) d.a.m. 195 MPa
Strain at break (5 mm/min | ISO 527-2) d.a.m. 1,9 %
Flexural modulus (2 mm/min | ISO 178) d.a.m. 15500 MPa
Flexural strength (2 mm/min | ISO 178) d.a.m. 300 MPa
Charpy impact strength (23°C | ISO 179-1/1eU) d.a.m. 64 kJ/m²
Charpy notched impact strength (23°C | ISO 179-1/1eA) d.a.m. 12 kJ/m²
Temperature of deflection under load HDT/A (1,8 MPa | ISO 75) 233 °C
Melting temperature (DSC, 10K/min | DIN EN ISO 11357-3) 260 °C
Burning rate (UL 94) 0,8mm Wall thickness HB Class
Density (23°C | ISO 1183) 1,65 g/cm³
Molding shrinkage (flow | ISO 294-4) 0,1 - 0,3 %
Molding shrinkage (transverse | ISO 294-4) 0,6 - 0,8 %
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)||120 - 140°C|
|Processing moisture||≤ 0,02%|
|Feed section||60 - 80°C|
|Temperature zone 1 - Zone 4||270 - 290°C|
|Nozzle temperature||270 - 295°C|
|Melt temperature||270 - 290°C|
|Mold temperature||130 - 160°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.
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.