Materials / Compare
Stainless 316 vs. Plastic TPU
Compare Stainless 316 vs. Plastic TPU 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 | 265MPasourcetypical (representative), annealed 1.0 mm sheet | not given (tensile used) |
| Ultimate tensile strength | 583MPasourcetypical (representative), annealed 1.0 mm sheet | 23.7MPasourcetypical, stress at break |
| Flexural strength | not sourced | 4.1MPasourcetypical |
| Elongation at break | 61%sourcetypical (representative), annealed, in 2 in. (51 mm) | not sourced |
| Young's modulus (stiffness) | 200GPasourcetypical, in tension | 0.067GPasourcetypical |
| Density | 8,027kg/m³sourcetypical | 1,220kg/m³sourcetypical6.58x lighter |
| Strength to weight | 33kN·m/kg1.7x higher | 19.4kN·m/kg |
| Stiffness to weight | 24.9MN·m/kg454x higher | 0.0549MN·m/kg |
| Poisson's ratio | 0.3sourcedesign value (structural stainless steels) | not sourced |
| Shear modulus | 76.9GPa | not sourced |
| Bulk modulus | 167GPa | not sourced |
| Speed of sound | 4,992m/s | 234m/s |
| Thermal | ||
| Thermal conductivity | 14.6W/m·Ksource20–100 °C | not sourced |
| Thermal expansion | 16.5µm/m·Ksourcemean, 20–100 °C | not sourced |
| 100 mm part over a 50 °C swing | 82.5µm growth | not sourced |
| Specific heat | 450J/kg·Ksourceat 20 °C | not sourced |
| Heats up and cools (diffusivity) | 4.04mm²/s | not sourced |
| Thermal shock resistance | 821W/m | not sourced |
| Melting point | 1,390–1,440°Csourcemelting range | 217°Csourcetypical |
| Max service temperature | 871–899°Csourceoxidation (scaling) limit in air | 50.3°CsourceHDT 0.455 MPa (printed specimens) |
| Values for | ATI 316 (UNS S31600), annealed 1.0 mm sheet, ATI technical data sheet (2012); Poisson's ratio from the Nickel Institute/SCI structural stainless design manual | Ultimaker TPU 95A, 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 (file v5.00), 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 TPU is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Stainless 316 stronger than Plastic TPU?
Stainless 316 is stronger: its yield strength is 265 MPa against tensile strength 23.7 MPa for Plastic TPU (11.2x).
Which is lighter, Stainless 316 or Plastic TPU?
Plastic TPU is lighter: 1,220 kg/m³ against 8,027 kg/m³ for Stainless 316.
Which is stiffer, Stainless 316 or Plastic TPU?
Stainless 316 is stiffer: Young's modulus 200 GPa against 0.067 GPa for Plastic TPU, so the same part in Stainless 316 deflects less under the same load.
Which is lighter for the same job, Stainless 316 or Plastic TPU?
For the same stiffness or strength: Stainless 316 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie; Plastic TPU is lighter for a strong beam, strong panel or plate.
| Part that must be | Stainless 316 | Plastic TPU |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 454x heavier |
| Stiff beam (bending) | lighter | 8.3x heavier |
| Stiff panel or plate | lighter | 2.19x heavier |
| Strong rod or tie | lighter | 1.7x heavier |
| Strong beam | 32% heavier | lighter |
| Strong panel or plate | 1.97x 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).