Materials / Compare
Aluminum 1100-O vs. Plastic PEEK
Compare Aluminum 1100-O vs. Plastic PEEK 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 | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | 90MPasourcetypical, O | not sourced |
| Compressive strength | not sourced | 125MPasourcetypical, 23 C |
| Flexural strength | not sourced | 165MPasourcetypical, flexural stress at yield, 23 C |
| Elongation at break | 35%sourcetypical, O, in 4D | 25%sourcetypical, at break |
| Young's modulus (stiffness) | 69GPasourcetypical | 4GPasourcetypical (nominal) |
| Density | 2,710kg/m³sourcenominal, 20 °C | 1,300kg/m³sourcetypical (crystalline) |
| Strength to weight | 12.9kN·m/kg | 75.4kN·m/kg5.84x higher |
| Stiffness to weight | 25.5MN·m/kg8.27x higher | 3.08MN·m/kg |
| Poisson's ratio | not sourced | 0.38sourcetypical |
| Shear modulus | not sourced | 1.45GPa |
| Bulk modulus | not sourced | 5.56GPa |
| Speed of sound | 5,046m/s | 1,754m/s |
| Thermal | ||
| Thermal conductivity | 222W/m·Ksourcetypical, O, 20 °C | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 23.6µm/m·Ksourcetypical, mean 20-100 °C | 55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C) |
| 100 mm part over a 50 °C swing | 118µm growth2.33x less | 275µm growth |
| Specific heat | 901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | 90.9mm²/s897x faster | 0.101mm²/s |
| Thermal shock resistance | not sourced | 80.1W/m |
| Melting point | 640–655°Csourcemelting range | 343°Csourcetypical, DSC |
| Glass transition | not sourced | 143°Csourceonset (midpoint 150 C) |
| Max service temperature | not sourced | 240°CsourceUL 746B RTI, mechanical strength (continuous use index) |
| 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). | Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07) |
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.
Questions
Is Aluminum 1100-O stronger than Plastic PEEK?
Plastic PEEK is stronger: its yield strength is 98 MPa against 35 MPa for Aluminum 1100-O (2.8x).
Which is lighter, Aluminum 1100-O or Plastic PEEK?
Plastic PEEK is lighter: 1,300 kg/m³ against 2,710 kg/m³ for Aluminum 1100-O.
Which is stiffer, Aluminum 1100-O or Plastic PEEK?
Aluminum 1100-O is stiffer: Young's modulus 69 GPa against 4 GPa for Plastic PEEK, 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 PEEK?
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 PEEK is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Aluminum 1100-O | Plastic PEEK |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 8.27x heavier |
| Stiff beam (bending) | lighter | 1.99x heavier |
| Stiff panel or plate | lighter | 24% heavier |
| Strong rod or tie | 5.84x heavier | lighter |
| Strong beam | 4.14x heavier | lighter |
| Strong panel or plate | 3.49x 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 PEEK?
Aluminum 1100-O conducts heat better: 222 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Aluminum 1100-O expands less: 23.6 µm/m·K against 55 µm/m·K for Plastic PEEK.