PBT – Polybutyleneterephthalate 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.
Precision parts in automobile and E/E industry
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)||100 - 120°C|
|Processing moisture||0,04 - 0,02%|
|Feed section||60 - 80°C|
|Temperature zone 1 - Zone 4||250 - 275°C|
|Nozzle temperature||250 - 280°C|
|Melting temperature||260 - 275°C|
|Mold temperature||80 - 100°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.
- 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 Strain at break (5 mm/min | ISO 527-2) d.a.m. 1,9 % 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
Burning rate (UL 94) 0,8mm Wall thickness HB Class GWFI (IEC 60695-2-12) 1,6mm Wall thickness 725 °C Burning rate (<100 mm/min) (> 1 mm Thickness | FMVSS 302) +
- 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) 0,1-0,3 % Molding shrinkage (transverse | ISO 294-4) 0,5-0,7 %
- Electrical Properties
Dieletric strength (3 mm | IEC 60243) 425 kV/mm
- Rheological Properties
MVR (250°C/2,16kg | ISO 1133) 2 cm³/10min
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.
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