PBT vs. PEI
Both PBT and PEI are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.
For each property being compared, the top bar is PBT and the bottom bar is PEI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.7 to 8.7 | |
| 3.4 to 5.6 |
| Elongation at Break, % | 2.5 to 43 | |
| 3.0 to 34 |
| Flexural Modulus, GPa | 2.6 to 9.1 | |
| 3.4 to 5.9 |
| Flexural Strength, MPa | 79 to 210 | |
| 140 to 210 |
| Tensile Strength: Ultimate (UTS), MPa | 58 to 140 | |
| 110 to 160 |
Thermal Properties
| Glass Transition Temperature, °C | 40 | |
| 210 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 4.0 | |
| 200 to 210 |
| Maximum Temperature: Autoignition, °C | 380 | |
| 530 |
| Maximum Temperature: Decomposition, °C | 380 | |
| 530 |
| Specific Heat Capacity, J/kg-K | 1040 to 1200 | |
| 1050 to 1220 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.3 to 1.5 |
| Limiting Oxygen Index (LOI), % | 20 | |
| 47 to 50 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.1 to 3.2 | |
| 1.5 to 2.1 |
| Stiffness to Weight: Bending, points | 35 to 45 | |
| 39 |
| Strength to Weight: Axial, points | 12 to 25 | |
| 24 to 30 |
| Strength to Weight: Bending, points | 25 to 38 | |
| 40 to 44 |