Unfilled PET vs. PBT
Both unfilled PET and PBT are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is unfilled PET and the bottom bar is PBT.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.5 | |
| 2.7 to 8.7 |
| Elongation at Break, % | 70 | |
| 2.5 to 43 |
| Tensile Strength: Ultimate (UTS), MPa | 60 | |
| 58 to 140 |
Thermal Properties
| Glass Transition Temperature, °C | 70 | |
| 40 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 80 | |
| 4.0 |
| Heat Deflection Temperature At 455 kPa (66 psi), °C | 120 | |
| 160 |
| Maximum Temperature: Autoignition, °C | 410 | |
| 380 |
| Maximum Temperature: Decomposition, °C | 390 | |
| 380 |
| Melting Onset (Solidus), °C | 260 | |
| 230 |
| Specific Heat Capacity, J/kg-K | 1150 | |
| 1040 to 1200 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 | |
| 1.3 to 1.5 |
| Limiting Oxygen Index (LOI), % | 21 | |
| 20 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.4 | |
| 1.1 to 3.2 |
| Stiffness to Weight: Bending, points | 37 | |
| 35 to 45 |
| Strength to Weight: Axial, points | 12 | |
| 12 to 25 |
| Strength to Weight: Bending, points | 25 | |
| 25 to 38 |