PET vs. HDPE
Both PET and HDPE are thermoplastics. There are 10 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is PET and the bottom bar is HDPE.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 1.4 to 1.6 | |
| 1.0 to 1.3 |
| Elongation at Break, % | 2.5 to 70 | |
| 2.5 to 100 |
| Flexural Modulus, GPa | 8.3 to 14 | |
| 4.0 to 7.5 |
| Impact Strength: Notched Izod, J/m | 43 to 85 | |
| 50 to 260 |
| Maximum Temperature: Mechanical, °C | 80 | |
| 90 |
| Specific Heat Capacity, J/kg-K | 1000 to 1150 | |
| 1330 to 2400 |
| Strength to Weight: Axial, points | 12 to 27 | |
| 6.9 to 17 |
| Strength to Weight: Bending, points | 25 to 41 | |
| 19 to 32 |
| Tensile Strength: Ultimate (UTS), MPa | 60 to 140 | |
| 24 to 80 |
| Water Absorption At Saturation, % | 0.24 to 0.5 | |
| 0.1 to 0.3 |