PET vs. PS
Both PET and PS 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 PET and the bottom bar is PS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.5 to 11 | |
| 1.9 to 2.9 |
| Elongation at Break, % | 2.5 to 70 | |
| 1.8 to 40 |
| Impact Strength: Notched Izod, J/m | 43 to 85 | |
| 19 to 45 |
| Tensile Strength: Ultimate (UTS), MPa | 60 to 140 | |
| 32 to 44 |
Thermal Properties
| Glass Transition Temperature, °C | 70 | |
| 100 |
| Maximum Temperature: Autoignition, °C | 410 | |
| 360 to 420 |
| Maximum Temperature: Decomposition, °C | 390 | |
| 320 to 330 |
| Maximum Temperature: Mechanical, °C | 80 | |
| 70 |
| Specific Heat Capacity, J/kg-K | 1000 to 1150 | |
| 1250 to 1400 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 to 1.6 | |
| 1.0 |
| Limiting Oxygen Index (LOI), % | 21 | |
| 18 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.2 to 4.4 | |
| 1.0 to 1.5 |
| Stiffness to Weight: Bending, points | 32 to 54 | |
| 40 to 45 |
| Strength to Weight: Axial, points | 12 to 27 | |
| 8.5 to 12 |
| Strength to Weight: Bending, points | 25 to 41 | |
| 22 to 26 |