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PS vs. PET

Both PS and PET are thermoplastics. There are 15 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 1.9 to 2.9
3.5 to 11
Elongation at Break, % 1.8 to 40
2.5 to 70
Impact Strength: Notched Izod, J/m 19 to 45
43 to 85
Tensile Strength: Ultimate (UTS), MPa 32 to 44
60 to 140

Thermal Properties

Glass Transition Temperature, °C 100
70
Maximum Temperature: Autoignition, °C 360 to 420
410
Maximum Temperature: Decomposition, °C 320 to 330
390
Maximum Temperature: Mechanical, °C 70
80
Specific Heat Capacity, J/kg-K 1250 to 1400
1000 to 1150

Otherwise Unclassified Properties

Density, g/cm3 1.0
1.4 to 1.6
Limiting Oxygen Index (LOI), % 18
21

Common Calculations

Stiffness to Weight: Axial, points 1.0 to 1.5
1.2 to 4.4
Stiffness to Weight: Bending, points 40 to 45
32 to 54
Strength to Weight: Axial, points 8.5 to 12
12 to 27
Strength to Weight: Bending, points 22 to 26
25 to 41