30% Carbon Fiber (30 CF) PEEK
30 CF PEEK is a grade of PEEK. It has the highest strength and lowest ductility compared to the other variants of PEEK. The graph bars on the material properties cards below compare 30 CF 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
Compressive (Crushing) Strength
300 MPa 44 x 103 psi
Elastic (Young's, Tensile) Modulus
24 GPa 3.5 x 106 psi
Elongation at Break
1.6 %
Flexural Modulus
19 GPa 2.7 x 106 psi
Flexural Strength
330 MPa 47 x 103 psi
Impact Strength: Notched Izod
78 J/m 1.5 ft-lb/in
Rockwell R Hardness
120
Shear Strength
100 MPa 15 x 103 psi
Tensile Strength: Ultimate (UTS)
200 MPa 30 x 103 psi
Thermal Properties
Glass Transition Temperature
240 °C 460 °F
Heat Deflection Temperature At 1.82 MPa (264 psi)
300 °C 580 °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
1520 J/kg-K 0.36 BTU/lb-°F
Thermal Conductivity
0.93 W/m-K 0.54 BTU/h-ft-°F
Thermal Expansion
15 µm/m-K
Other Material Properties
Density
1.4 g/cm3 87 lb/ft3
Electrical Resistivity Order of Magnitude
3.0 10x Ω-m
Limiting Oxygen Index (LOI)
38 %
Water Absorption After 24 Hours
0.060 %
Water Absorption At Saturation
0.22 %
Common Calculations
Stiffness to Weight: Axial
9.5 points
Stiffness to Weight: Bending
69 points
Strength to Weight: Axial
41 points
Strength to Weight: Bending
55 points
Thermal Diffusivity
0.44 mm2/s
Thermal Shock Resistance
40 points
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