Materials / Compare
Aluminum 2024-T351 vs. Plastic PEEK
Compare Aluminum 2024-T351 vs. Plastic PEEK strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 324MPasourcetypical, 0.2% offset, .500 in dia specimen | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | 469MPasourcetypical | not sourced |
| Compressive strength | not sourced | 125MPasourcetypical, 23 C |
| Flexural strength | not sourced | 165MPasourcetypical, flexural stress at yield, 23 C |
| Elongation at break | 19%sourcetypical, in 4D | 25%sourcetypical, at break |
| Young's modulus (stiffness) | 73.1GPasourcetypical | 4GPasourcetypical (nominal) |
| Density | 2,770kg/m³sourcenominal | 1,300kg/m³sourcetypical (crystalline) |
| Strength to weight | 117kN·m/kg1.55x higher | 75.4kN·m/kg |
| Stiffness to weight | 26.4MN·m/kg8.58x higher | 3.08MN·m/kg |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant), all tempers | 0.38sourcetypical |
| Shear modulus | 27.5GPa19x stiffer in shear | 1.45GPa |
| Bulk modulus | 71.7GPa | 5.56GPa |
| Speed of sound | 5,137m/s | 1,754m/s |
| Thermal | ||
| Thermal conductivity | 120W/m·Ksourcetypical, 20 °C | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 22.9µm/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 | 115µm growth2.4x less | 275µm growth |
| Specific heat | 875J/kg·Ksourcetypical, at 100 °C | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | 49.5mm²/s488x faster | 0.101mm²/s |
| Thermal shock resistance | 15,561W/m194x more resistant | 80.1W/m |
| Melting point | 502–638°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 | 2024-T4/T351, Kaiser Aluminum sheet, coil & plate typical datasheet; Poisson from MIL-HDBK-5J | 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 2024-T351 stronger than Plastic PEEK?
Aluminum 2024-T351 is stronger: its yield strength is 324 MPa against 98 MPa for Plastic PEEK (3.31x).
Which is lighter, Aluminum 2024-T351 or Plastic PEEK?
Plastic PEEK is lighter: 1,300 kg/m³ against 2,770 kg/m³ for Aluminum 2024-T351.
Which is stiffer, Aluminum 2024-T351 or Plastic PEEK?
Aluminum 2024-T351 is stiffer: Young's modulus 73.1 GPa against 4 GPa for Plastic PEEK, so the same part in Aluminum 2024-T351 deflects less under the same load.
Which is lighter for the same job, Aluminum 2024-T351 or Plastic PEEK?
For the same stiffness or strength: Aluminum 2024-T351 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam; Plastic PEEK is lighter for a strong panel or plate.
| Part that must be | Aluminum 2024-T351 | Plastic PEEK |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 8.58x heavier |
| Stiff beam (bending) | lighter | 2.01x heavier |
| Stiff panel or plate | lighter | 24% heavier |
| Strong rod or tie | lighter | 1.55x heavier |
| Strong beam | lighter | 4% heavier |
| Strong panel or plate | 17% 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 2024-T351 or Plastic PEEK?
Aluminum 2024-T351 conducts heat better: 120 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Aluminum 2024-T351 expands less: 22.9 µm/m·K against 55 µm/m·K for Plastic PEEK.