PPA
PPA (polyphthalamides) are among the high-performance polyamides and are particularly impressive due to their very high stiffness and strength, even at elevated temperatures and after water absorption. They are particularly suitable as metal substitutes.
Trade name: Grivory
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Physical properties
Density in kg/m³
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Humidity absorption 23°C/50% r.h. in %.
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Water absorption in %
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Mechanical properties
Compression set at 23°C in %.
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Compression set at 70°C in %.
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Tensile modulus in MPa
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Notched impact strength (Charpy) at -30°C in kJ/m²
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Notched impact strength (Charpy) at 23°C in kJ/m²
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Impact strength (Charpy) at -30°C in kJ/m²
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Impact strength (Charpy) at 23°C in kJ/m²
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Shore A hardness
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Shore D hardness
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Stress at 10% elongation in MPa
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Stress at 100% elongation in MPa
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Stress at 300% elongation in MPa
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Strain at break in %
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Stress at 50% elongation in MPa
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Stress at break in MPa
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Strain at yield in %
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Compressive strength in MPa
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Stress at yield in MPa
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Compression set at 100°C in %
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Tear strength in kN/m
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Rheological properties
Melt flow rate MFR in g/10min
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Melt flow rate MFR (test condition)
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Molding shrinkage in flow direction in %
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Molding shrinkage transverse to the flow direction in %
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Thermal properties
Maximum service temperature short term in °C
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Melting temperature (DSC, 10°C/min) in °C
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Yellow Card available
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Vicat softening temperature (50°C/h 50N) in °C
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Coeff. of linear therm. expansion in flow direction in E-6/K
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Coeff. of linear therm. expansion transverse to the flow direction in E-6/K
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Temp. of deflection under load, 0.45 MPa in °C
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Temp. of deflection under load, 1.80 MPa in °C
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Thermal conductivity in plane in W/mK
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Thermal conductivity through plane in W/mK
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Burning behavior at thickness 0.4 mm
Burning behavior at thickness 0.8 mm
Burning behavior at thickness 1.6 mm
Burning behavior at thickness 3.2 mm
Maximum service temperature long term in °C
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Glass transition temperature in °C
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Electrical properties
Volume resistivity in Ohm*m
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Electric strength in kV/mm
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Comparative tracking index (CTI) in V
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Surface resistivity in ohm
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Magnetic properties
Coercivity (jHc) in kA/m
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max. energy product (BH max) in kJ/m³
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Remanence (Br) in mT
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