Epoxy vs. PMMA
Epoxy belongs to the thermoset plastics classification, while PMMA belongs to the thermoplastics. There are 20 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 epoxy and the bottom bar is PMMA.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.4 | |
| 3.2 |
| Elongation at Break, % | 4.5 | |
| 4.0 |
| Shear Modulus, GPa | 0.85 | |
| 1.7 |
| Tensile Strength: Ultimate (UTS), MPa | 67 | |
| 71 |
Thermal Properties
| Glass Transition Temperature, °C | 120 | |
| 110 |
| Maximum Temperature: Autoignition, °C | 430 | |
| 320 |
| Maximum Temperature: Decomposition, °C | 430 | |
| 360 |
| Specific Heat Capacity, J/kg-K | 1500 | |
| 1260 |
| Thermal Conductivity, W/m-K | 0.2 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 100 | |
| 76 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 16 | |
| 30 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 | |
| 1.2 |
| Limiting Oxygen Index (LOI), % | 20 | |
| 17 |
| Refractive Index | 1.6 | |
| 1.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 | |
| 1.5 |
| Stiffness to Weight: Bending, points | 34 | |
| 42 |
| Strength to Weight: Axial, points | 14 | |
| 17 |
| Strength to Weight: Bending, points | 28 | |
| 32 |
| Thermal Diffusivity, mm2/s | 0.1 | |
| 0.13 |
| Thermal Shock Resistance, points | 20 | |
| 21 |