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PS vs. PEEK

Both PS and PEEK are thermoplastics. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 1.9 to 2.9
4.0 to 24
Elongation at Break, % 1.8 to 40
1.6 to 43
Flexural Strength, MPa 62 to 80
150 to 330
Impact Strength: Notched Izod, J/m 19 to 45
78 to 120
Tensile Strength: Ultimate (UTS), MPa 32 to 44
97 to 200

Thermal Properties

Glass Transition Temperature, °C 100
240
Maximum Temperature: Autoignition, °C 360 to 420
600
Maximum Temperature: Decomposition, °C 320 to 330
570
Maximum Temperature: Mechanical, °C 70
330
Specific Heat Capacity, J/kg-K 1250 to 1400
1390 to 1700
Thermal Conductivity, W/m-K 0.14 to 0.22
0.25 to 0.93
Thermal Expansion, µm/m-K 80 to 98
15 to 52

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 1.0
1.3 to 1.5
Limiting Oxygen Index (LOI), % 18
38
Water Absorption After 24 Hours, % 0.040 to 0.080
0.060 to 0.3

Common Calculations

Stiffness to Weight: Axial, points 1.0 to 1.5
1.5 to 10
Stiffness to Weight: Bending, points 40 to 45
36 to 73
Strength to Weight: Axial, points 8.5 to 12
20 to 41
Strength to Weight: Bending, points 22 to 26
36 to 55
Thermal Diffusivity, mm2/s 0.11 to 0.15
0.1 to 0.51
Thermal Shock Resistance, points 11 to 15
34 to 57