Materials / Compare
Aluminum 1100-O vs. Plastic PETG
Compare Aluminum 1100-O vs. Plastic PETG strength, stiffness, weight and thermal properties.
| Try it on a partA sample part to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 35MPasourcetypical, O, 0.0625 in specimen | 46.2MPasourcetypical |
| Ultimate tensile strength | 90MPasourcetypical, O | 46.2MPasourcetypical, peak stress (= stress at yield) |
| Flexural strength | not sourced | 78.9MPasourcetypical |
| Elongation at break | 35%sourcetypical, O, in 4D | 7.6%sourcetypical |
| Young's modulus (stiffness) | 69GPasourcetypical35.6x stiffer | 1.94GPasourcetypical |
| Density | 2,710kg/m³sourcenominal, 20 °C | 1,270kg/m³sourcetypical |
| Strength to weight | 12.9kN·m/kg | 36.4kN·m/kg2.82x higher |
| Stiffness to weight | 25.5MN·m/kg16.7x higher | 1.53MN·m/kg |
| Poisson's ratio | not sourced | not sourced |
| Shear modulus | not sourced | not sourced |
| Bulk modulus | not sourced | not sourced |
| Speed of sound | 5,046m/s | 1,236m/s |
| Thermal | ||
| Thermal conductivity | 222W/m·Ksourcetypical, O, 20 °C | 0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical |
| Thermal expansion | 23.6µm/m·Ksourcetypical, mean 20-100 °C | 51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical |
| 100 mm part over a 50 °C swing | 118µm growth2.16x less | 255µm growth |
| Specific heat | 901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C | 1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed) |
| Heats up and cools (diffusivity) | 90.9mm²/s715x faster | 0.127mm²/s |
| Thermal shock resistance | not sourced | not sourced |
| Melting point | 640–655°Csourcemelting range | not sourced |
| Glass transition | not sourced | 77.4°Csourcetypical |
| Max service temperature | not sourced | 76.2°CsourceHDT 0.455 MPa (printed specimens) |
| Values for | 1100-O (annealed) commercially pure aluminium, Kaiser Aluminum Tube & Pipe Alloy 1100 Technical Data (Rev. 05/06), typical properties; specific heat from Hydro EN AW-1050A (99.5% Al) extruded-products datasheet (10/2018). | Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022. |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Plastic PETG is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Aluminum 1100-O stronger than Plastic PETG?
Plastic PETG is stronger: its yield strength is 46.2 MPa against 35 MPa for Aluminum 1100-O (32%).
Which is lighter, Aluminum 1100-O or Plastic PETG?
Plastic PETG is lighter: 1,270 kg/m³ against 2,710 kg/m³ for Aluminum 1100-O.
Which is stiffer, Aluminum 1100-O or Plastic PETG?
Aluminum 1100-O is stiffer: Young's modulus 69 GPa against 1.94 GPa for Plastic PETG, so the same part in Aluminum 1100-O deflects less under the same load.
Which is lighter for the same job, Aluminum 1100-O or Plastic PETG?
For the same stiffness or strength: Aluminum 1100-O is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Plastic PETG is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Aluminum 1100-O | Plastic PETG |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 16.7x heavier |
| Stiff beam (bending) | lighter | 2.8x heavier |
| Stiff panel or plate | lighter | 1.54x heavier |
| Strong rod or tie | 2.82x heavier | lighter |
| Strong beam | 2.57x heavier | lighter |
| Strong panel or plate | 2.45x heavier | lighter |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Aluminum 1100-O or Plastic PETG?
Aluminum 1100-O conducts heat better: 222 W/m·K against 0.21 W/m·K for Plastic PETG.
Which expands less with temperature?
Aluminum 1100-O expands less: 23.6 µm/m·K against 51 µm/m·K for Plastic PETG.