PEI vs. PMMA
Both PEI and PMMA are thermoplastics. There are 23 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 PEI and the bottom bar is PMMA.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 140 to 180 | |
| 120 |
| Elastic (Young's, Tensile) Modulus, GPa | 3.4 to 5.6 | |
| 3.2 |
| Elongation at Break, % | 3.0 to 34 | |
| 4.0 |
| Flexural Strength, MPa | 140 to 210 | |
| 110 |
| Impact Strength: Notched Izod, J/m | 55 to 110 | |
| 74 |
| Rockwell M Hardness | 110 to 130 | |
| 93 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 160 | |
| 71 |
Thermal Properties
| Glass Transition Temperature, °C | 210 | |
| 110 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 200 to 210 | |
| 96 |
| Maximum Temperature: Autoignition, °C | 530 | |
| 320 |
| Maximum Temperature: Decomposition, °C | 530 | |
| 360 |
| Specific Heat Capacity, J/kg-K | 1050 to 1220 | |
| 1260 |
| Thermal Conductivity, W/m-K | 0.18 to 0.23 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 20 to 53 | |
| 76 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 30 to 33 | |
| 30 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.2 |
| Limiting Oxygen Index (LOI), % | 47 to 50 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 2.1 | |
| 1.5 |
| Stiffness to Weight: Bending, points | 39 | |
| 42 |
| Strength to Weight: Axial, points | 24 to 30 | |
| 17 |
| Strength to Weight: Bending, points | 40 to 44 | |
| 32 |
| Thermal Diffusivity, mm2/s | 0.11 to 0.14 | |
| 0.13 |
| Thermal Shock Resistance, points | 44 to 100 | |
| 21 |