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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


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


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