PS vs. Thermoplastic PI
Both PS and thermoplastic PI are thermoplastics. There are 14 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is PS and the bottom bar is thermoplastic PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 1.9 to 2.9 | |
| 3.7 to 20 |
| Elongation at Break, % | 1.8 to 40 | |
| 1.8 to 7.5 |
| Flexural Strength, MPa | 62 to 80 | |
| 170 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 32 to 44 | |
| 110 to 220 |
Thermal Properties
| Glass Transition Temperature, °C | 100 | |
| 260 |
| Maximum Temperature: Autoignition, °C | 360 to 420 | |
| 600 |
| Maximum Temperature: Decomposition, °C | 320 to 330 | |
| 530 |
| Specific Heat Capacity, J/kg-K | 1250 to 1400 | |
| 970 to 1100 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.4 to 1.5 |
| Limiting Oxygen Index (LOI), % | 18 | |
| 35 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 to 1.5 | |
| 1.5 to 7.9 |
| Stiffness to Weight: Bending, points | 40 to 45 | |
| 37 to 64 |
| Strength to Weight: Axial, points | 8.5 to 12 | |
| 22 to 42 |
| Strength to Weight: Bending, points | 22 to 26 | |
| 36 to 57 |