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PS vs. PES

Both PS and PES are thermoplastics. There are 23 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 PES.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 1.9 to 2.9
2.6
Elongation at Break, % 1.8 to 40
65
Flexural Strength, MPa 62 to 80
130
Impact Strength: Notched Izod, J/m 19 to 45
91
Tensile Strength: Ultimate (UTS), MPa 32 to 44
87

Thermal Properties

Glass Transition Temperature, °C 100
220
Maximum Temperature: Autoignition, °C 360 to 420
500
Maximum Temperature: Decomposition, °C 320 to 330
540
Maximum Temperature: Mechanical, °C 70
200
Specific Heat Capacity, J/kg-K 1250 to 1400
1100
Thermal Conductivity, W/m-K 0.14 to 0.22
0.18
Thermal Expansion, µm/m-K 80 to 98
53

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 18 to 20
16
Electrical Resistivity Order of Magnitude, 10x Ω-m 14 to 15
15

Otherwise Unclassified Properties

Density, g/cm3 1.0
1.4
Limiting Oxygen Index (LOI), % 18
36
Water Absorption After 24 Hours, % 0.040 to 0.080
0.34

Common Calculations

Stiffness to Weight: Axial, points 1.0 to 1.5
1.1
Stiffness to Weight: Bending, points 40 to 45
33
Strength to Weight: Axial, points 8.5 to 12
18
Strength to Weight: Bending, points 22 to 26
32
Thermal Diffusivity, mm2/s 0.11 to 0.15
0.12
Thermal Shock Resistance, points 11 to 15
45