20% Glass Fiber (20 GF) PEEK
20 GF PEEK is a grade of PEEK. The graph bars on the material properties cards below compare 20 GF PEEK to: otherwise unclassified thermoplastics (top), all thermoplastics (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elongation at Break
2.5 %
Flexural Modulus
6.7 GPa 1.0 x 106 psi
Flexural Strength
190 MPa 28 x 103 psi
Impact Strength: Notched Izod
85 J/m 1.6 ft-lb/in
Tensile Strength: Ultimate (UTS)
120 MPa 18 x 103 psi
Thermal Properties
Glass Transition Temperature
240 °C 460 °F
Heat Deflection Temperature At 1.82 MPa (264 psi)
290 °C 550 °F
Maximum Temperature: Autoignition
600 °C 1100 °F
Maximum Temperature: Decomposition
570 °C 1060 °F
Maximum Temperature: Mechanical
330 °C 630 °F
Melting Onset (Solidus)
340 °C 640 °F
Specific Heat Capacity
1390 J/kg-K 0.33 BTU/lb-°F
Otherwise Unclassified Properties
Density
1.4 g/cm3 89 lb/ft3
Limiting Oxygen Index (LOI)
38 %
Common Calculations
Stiffness to Weight: Axial
1.5 to 10 points
Stiffness to Weight: Bending
36 to 73 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
38 points
Thermal Diffusivity
0.1 to 0.51 mm2/s
Followup Questions
Further Reading
ASTM F2026: Standard Specification for Polyetheretherketone (PEEK) Polymers for Surgical Implant Applications
Reinforced Plastics Durability, Geoffrey Pritchard (editor), 1999
SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000
Modern Plastics Handbook, Charles A. Harper (editor), 1999
Plastics Materials, 7th ed., J. A. Brydson, 1999
Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012