PPO vs. PEEK

Both PPO and PEEK are thermoplastics. There are 15 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is PPO and the bottom bar is PEEK.

Polyphenylene Oxide (PPO)Polyetheretherketone (PEEK)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		3.5 to 28
Elongation at Break, %		1.6 to 43

Flexural Modulus, GPa		2.5 to 8.6
Flexural Modulus, GPa		3.8 to 19

Flexural Strength, MPa		92 to 140
Flexural Strength, MPa		150 to 330

Impact Strength: Notched Izod, J/m		80 to 270
Impact Strength: Notched Izod, J/m		78 to 120

Tensile Strength: Ultimate (UTS), MPa		63 to 140
Tensile Strength: Ultimate (UTS), MPa		97 to 200

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		120 to 140
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		160 to 300

Maximum Temperature: Mechanical, °C		100 to 110
Maximum Temperature: Mechanical, °C		330

Specific Heat Capacity, J/kg-K		1020 to 1250
Specific Heat Capacity, J/kg-K		1390 to 1700

Thermal Expansion, µm/m-K		25 to 60
Thermal Expansion, µm/m-K		15 to 52

Electrical Properties

Electrical Resistivity Order of Magnitude, 10^x Ω-m		15
Electrical Resistivity Order of Magnitude, 10^x Ω-m		3.0 to 14

Otherwise Unclassified Properties

Density, g/cm³		1.1 to 1.4
Density, g/cm³		1.3 to 1.5

Limiting Oxygen Index (LOI), %		32
Limiting Oxygen Index (LOI), %		38

Water Absorption After 24 Hours, %		0.060 to 0.070
Water Absorption After 24 Hours, %		0.060 to 0.3

Common Calculations

Strength to Weight: Axial, points		16 to 27
Strength to Weight: Axial, points		20 to 41

Strength to Weight: Bending, points		33 to 42
Strength to Weight: Bending, points		36 to 55