PS vs. PMMA
Both PS and PMMA are thermoplastics. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is PS and the bottom bar is PMMA.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 1.9 to 2.9 | |
| 3.2 |
| Elongation at Break, % | 1.8 to 40 | |
| 4.0 |
| Flexural Strength, MPa | 62 to 80 | |
| 110 |
| Impact Strength: Notched Izod, J/m | 19 to 45 | |
| 74 |
| Tensile Strength: Ultimate (UTS), MPa | 32 to 44 | |
| 71 |
Thermal Properties
| Glass Transition Temperature, °C | 100 | |
| 110 |
| Maximum Temperature: Autoignition, °C | 360 to 420 | |
| 320 |
| Maximum Temperature: Decomposition, °C | 320 to 330 | |
| 360 |
| Specific Heat Capacity, J/kg-K | 1250 to 1400 | |
| 1260 |
| Thermal Conductivity, W/m-K | 0.14 to 0.22 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 80 to 98 | |
| 76 |
| Vicat Softening Temperature, °C | 100 to 110 | |
| 90 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 18 to 20 | |
| 30 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.2 |
| Limiting Oxygen Index (LOI), % | 18 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 to 1.5 | |
| 1.5 |
| Stiffness to Weight: Bending, points | 40 to 45 | |
| 42 |
| Strength to Weight: Axial, points | 8.5 to 12 | |
| 17 |
| Strength to Weight: Bending, points | 22 to 26 | |
| 32 |
| Thermal Diffusivity, mm2/s | 0.11 to 0.15 | |
| 0.13 |
| Thermal Shock Resistance, points | 11 to 15 | |
| 21 |