PMMA vs. PBI
PMMA belongs to the thermoplastics classification, while PBI belongs to the thermoset plastics. There are 22 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 PMMA and the bottom bar is PBI.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 120 | |
| 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 3.2 | |
| 5.9 |
| Elongation at Break, % | 4.0 | |
| 3.0 |
| Flexural Strength, MPa | 110 | |
| 220 |
| Impact Strength: Notched Izod, J/m | 74 | |
| 27 |
| Tensile Strength: Ultimate (UTS), MPa | 71 | |
| 160 |
Thermal Properties
| Glass Transition Temperature, °C | 110 | |
| 410 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 96 | |
| 430 |
| Maximum Temperature: Decomposition, °C | 360 | |
| 590 |
| Specific Heat Capacity, J/kg-K | 1260 | |
| 930 |
| Thermal Conductivity, W/m-K | 0.19 | |
| 0.41 |
| Thermal Expansion, µm/m-K | 76 | |
| 23 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 3.6 | |
| 3.4 |
| Dielectric Strength (Breakdown Potential), kV/mm | 30 | |
| 23 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.2 | |
| 1.3 |
| Limiting Oxygen Index (LOI), % | 17 | |
| 58 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 | |
| 2.5 |
| Stiffness to Weight: Bending, points | 42 | |
| 46 |
| Strength to Weight: Axial, points | 17 | |
| 34 |
| Strength to Weight: Bending, points | 32 | |
| 50 |
| Thermal Diffusivity, mm2/s | 0.13 | |
| 0.34 |
| Thermal Shock Resistance, points | 21 | |
| 84 |