Materials / Compare
Aluminum 6061-T6 vs. Plastic UHMWPE
Compare Aluminum 6061-T6 vs. Plastic UHMWPE 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 | 276MPasourcetypical, 0.2% offset, .500 in dia specimen | 20MPasourcetypical, tensile stress at yield ISO 527, 50 mm/min |
| Ultimate tensile strength | 310MPasourcetypical | 43MPasourcetypical, tensile stress at break ISO 527, 50 mm/min |
| Elongation at break | 17%sourcetypical, in 4D, 0.500 in dia specimen | 465%sourcetypical, nominal elongation at break ISO 527 |
| Young's modulus (stiffness) | 68.3GPasourcetypical | 0.66GPasourcetypical, tensile modulus ISO 527, 1 mm/min |
| Density | 2,700kg/m³sourcenominal | 930kg/m³sourcetypical |
| Strength to weight | 102kN·m/kg4.75x higher | 21.5kN·m/kg |
| Stiffness to weight | 25.3MN·m/kg35.6x higher | 0.71MN·m/kg |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant) | not sourced |
| Shear modulus | 25.7GPa | not sourced |
| Bulk modulus | 67GPa | not sourced |
| Speed of sound | 5,030m/s | 842m/s |
| Thermal | ||
| Thermal conductivity | 167W/m·Ksourcetypical, 20 °C | 0.4W/m·Ksourcetypical, unfilled (narrative value, generic Celanese UHMWPE) |
| Thermal expansion | 23.6µm/m·Ksourcetypical, mean 20-100 °C | 200µm/m·Ksourcetypical, 20 to 100 °C (generic Celanese UHMWPE) |
| 100 mm part over a 50 °C swing | 118µm growth8.47x less | 1,000µm growth |
| Specific heat | 896J/kg·Ksourcetypical, at 100 °C | not sourced |
| Heats up and cools (diffusivity) | 69mm²/s | not sourced |
| Thermal shock resistance | 19,159W/m | not sourced |
| Melting point | 582–652°Csourcesolidus-liquidus | 130–138°CsourceDSC 10 K/min |
| Max service temperature | not sourced | 80°Csourcerecommended max constant operating temperature |
| Values for | 6061-T6/T651, Kaiser Aluminum typical properties; Poisson from MIL-HDBK-5J | Celanese GUR 4120 (avg. molecular weight 4.7x10^6 g/mol), typical values on compression-molded specimens; CTE and thermal conductivity from Celanese's generic UHMWPE guide (grade not named) |
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 6061-T6 stronger than Plastic UHMWPE?
Aluminum 6061-T6 is stronger: its yield strength is 276 MPa against 20 MPa for Plastic UHMWPE (13.8x).
Which is lighter, Aluminum 6061-T6 or Plastic UHMWPE?
Plastic UHMWPE is lighter: 930 kg/m³ against 2,700 kg/m³ for Aluminum 6061-T6.
Which is stiffer, Aluminum 6061-T6 or Plastic UHMWPE?
Aluminum 6061-T6 is stiffer: Young's modulus 68.3 GPa against 0.66 GPa for Plastic UHMWPE, so the same part in Aluminum 6061-T6 deflects less under the same load.
Which is lighter for the same job, Aluminum 6061-T6 or Plastic UHMWPE?
For the same stiffness or strength: Aluminum 6061-T6 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Aluminum 6061-T6 | Plastic UHMWPE |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 35.6x heavier |
| Stiff beam (bending) | lighter | 3.5x heavier |
| Stiff panel or plate | lighter | 1.62x heavier |
| Strong rod or tie | lighter | 4.75x heavier |
| Strong beam | lighter | 1.98x heavier |
| Strong panel or plate | lighter | 28% heavier |
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 6061-T6 or Plastic UHMWPE?
Aluminum 6061-T6 conducts heat better: 167 W/m·K against 0.4 W/m·K for Plastic UHMWPE.
Which expands less with temperature?
Aluminum 6061-T6 expands less: 23.6 µm/m·K against 200 µm/m·K for Plastic UHMWPE.