PBT – Polybutyleneterephthalate PBTPRECITE® 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.
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
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
Burning rate 5V (UL 94) 0,8mm Wall thickness HB Class
Burning rate (<100 mm/min) (> 1 mm Thickness | FMVSS 302) +
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 %
MVR (250°C/2,16kg | ISO 1133) 50 cm³/10min
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||0,02 - 0,04%|
|Feed section||60 - 80°C|
|Temperature zone 1 - Zone 4||240 - 270°C|
|Nozzle temperature||240 - 280°C|
|Melt temperature||250 - 270°C|
|Mold temperature||60 - 80°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.