PET – Polyethyleneterephthalate PET GF50
PRECITE® E GF 50 ECO black (8272)PRECITE® E GF 50 ECO black (8272) is a 50% glass fibre reinforced, medium viscous polyethylene terephthalate (PET) with very high stiffness and toughness as well as high chemical resistance. 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.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.
Properties
Tensile Modulus Tensile Strength Impact StrengthFeatures
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Mechanical Properties
Tensile modulus (1 mm/min | ISO 527-2) d.a.m. 18500 MPa
Stress at break (5 mm/min | ISO 527-2) d.a.m. 210 MPa
Strain at break (5 mm/min | ISO 527-2) d.a.m. 1,7 %
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. 10 kJ/m²
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Thermal Properties
Temperature of deflection under load HDT/A (1,8 MPa | ISO 75) 235 °C
Melting temperature (DSC, 10K/min | DIN EN ISO 11357-3) 250 °C
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Flammability
Burning rate (UL 94) 0,8mm Wall thickness HB Class
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General properties
Density (23°C | ISO 1183) 1,75 g/cm³
Molding shrinkage (flow | ISO 294-4) 0,1 - 0,3 %
Molding shrinkage (transverse | ISO 294-4) 0,5 - 0,7 %
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Rheological Properties
MVR (275°C/5kg | ISO 1133) 7 cm³/10min
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Sustainability
Recycled content (at least) 25 %
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.
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Drying time | 3 - 4 h |
| Drying temperature (τ ≤ -30°C) | 120 - 140°C | |
| Processing moisture | ≤ 0,02% | |
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Feed section | 60 - 80°C |
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Temperature zone 1 - Zone 4 | 270 - 290°C |
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Nozzle temperature | 270 - 295°C |
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Melt temperature | 270 - 290°C |
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Mold temperature | 130 - 160°C |
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Holding pressure, spec. | 300 - 800 bar |
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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.
