PS vs. PPA
Both PS and PPA are thermoplastics. There are 16 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 PPA.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 1.9 to 2.9 | |
| 2.1 to 2.2 |
| Elongation at Break, % | 1.8 to 40 | |
| 30 |
| Flexural Strength, MPa | 62 to 80 | |
| 95 to 110 |
| Poisson's Ratio | 0.4 to 0.41 | |
| 0.4 |
| Tensile Strength: Ultimate (UTS), MPa | 32 to 44 | |
| 57 to 69 |
Thermal Properties
| Glass Transition Temperature, °C | 100 | |
| 92 to 130 |
| Maximum Temperature: Decomposition, °C | 320 to 330 | |
| 450 |
| Specific Heat Capacity, J/kg-K | 1250 to 1400 | |
| 1400 |
| Thermal Conductivity, W/m-K | 0.14 to 0.22 | |
| 0.15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.1 |
| Water Absorption After 24 Hours, % | 0.040 to 0.080 | |
| 0.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 to 1.5 | |
| 1.0 to 1.1 |
| Stiffness to Weight: Bending, points | 40 to 45 | |
| 38 |
| Strength to Weight: Axial, points | 8.5 to 12 | |
| 14 to 17 |
| Strength to Weight: Bending, points | 22 to 26 | |
| 29 to 33 |
| Thermal Diffusivity, mm2/s | 0.11 to 0.15 | |
| 0.095 |