PETG vs. PEEK
Both PETG and PEEK are thermoplastics. 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 PETG and the bottom bar is PEEK.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 55 | |
| 120 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 2.2 | |
| 4.0 to 24 |
| Flexural Modulus, GPa | 2.1 | |
| 3.8 to 19 |
| Flexural Strength, MPa | 77 | |
| 150 to 330 |
| Impact Strength: Notched Izod, J/m | 77 | |
| 78 to 120 |
| Rockwell R Hardness | 120 | |
| 120 |
| Shear Strength, MPa | 62 | |
| 50 to 100 |
| Tensile Strength: Ultimate (UTS), MPa | 53 | |
| 97 to 200 |
Thermal Properties
| Glass Transition Temperature, °C | 81 | |
| 240 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 69 | |
| 160 to 300 |
| Melting Onset (Solidus), °C | 140 | |
| 340 |
| Specific Heat Capacity, J/kg-K | 1200 | |
| 1390 to 1700 |
| Thermal Conductivity, W/m-K | 0.29 | |
| 0.25 to 0.93 |
| Thermal Expansion, µm/m-K | 68 | |
| 15 to 52 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 | |
| 1.3 to 1.5 |
| Water Absorption After 24 Hours, % | 0.2 | |
| 0.060 to 0.3 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 | |
| 1.5 to 10 |
| Stiffness to Weight: Bending, points | 34 | |
| 36 to 73 |
| Strength to Weight: Axial, points | 12 | |
| 20 to 41 |
| Strength to Weight: Bending, points | 25 | |
| 36 to 55 |
| Thermal Diffusivity, mm2/s | 0.19 | |
| 0.1 to 0.51 |
| Thermal Shock Resistance, points | 25 | |
| 34 to 57 |