Materials / Compare
Plastic PLA vs. Stainless 316
Compare Plastic PLA vs. Stainless 316 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 | 52.5MPasourcetypical | 265MPasourcetypical (representative), annealed 1.0 mm sheet |
| Ultimate tensile strength | 52.5MPasourcetypical, peak stress (= stress at yield) | 583MPasourcetypical (representative), annealed 1.0 mm sheet |
| Flexural strength | 96.8MPasourcetypical | not sourced |
| Elongation at break | 7.8%sourcetypical | 61%sourcetypical (representative), annealed, in 2 in. (51 mm) |
| Young's modulus (stiffness) | 3.25GPasourcetypical | 200GPasourcetypical, in tension |
| Density | 1,240kg/m³sourcetypical6.47x lighter | 8,027kg/m³sourcetypical |
| Strength to weight | 42.3kN·m/kg28% higher | 33kN·m/kg |
| Stiffness to weight | 2.62MN·m/kg | 24.9MN·m/kg9.51x higher |
| Poisson's ratio | not sourced | 0.3sourcedesign value (structural stainless steels) |
| Shear modulus | not sourced | 76.9GPa |
| Bulk modulus | not sourced | 167GPa |
| Speed of sound | 1,619m/s | 4,992m/s |
| Thermal | ||
| Thermal conductivity | 0.13W/m·Ksourcebase material: NatureWorks Ingeo biopolymer, amorphous sheet, 25 °C | 14.6W/m·Ksource20–100 °C |
| Thermal expansion | not sourced | 16.5µm/m·Ksourcemean, 20–100 °C |
| 100 mm part over a 50 °C swing | not sourced | 82.5µm growth |
| Specific heat | 1,200J/kg·Ksourcebase material: NatureWorks Ingeo biopolymer, amorphous sheet, 25 °C | 450J/kg·Ksourceat 20 °C |
| Heats up and cools (diffusivity) | 0.0874mm²/s | 4.04mm²/s46.3x faster |
| Thermal shock resistance | not sourced | 821W/m |
| Melting point | 152°Csourcetypical | 1,390–1,440°Csourcemelting range |
| Glass transition | 59.1°Csourcetypical | not sourced |
| Max service temperature | 58.8°CsourceHDT 0.455 MPa (printed specimens) | 871–899°Csourceoxidation (scaling) limit in air |
| Values for | Ultimaker PLA, 3D-printed specimens, XY (flat) orientation; 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 dated April 20, 2022. | 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 |
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 PLA is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic PLA stronger than Stainless 316?
Stainless 316 is stronger: its yield strength is 265 MPa against 52.5 MPa for Plastic PLA (5.05x).
Which is lighter, Plastic PLA or Stainless 316?
Plastic PLA is lighter: 1,240 kg/m³ against 8,027 kg/m³ for Stainless 316.
Which is stiffer, Plastic PLA or Stainless 316?
Stainless 316 is stiffer: Young's modulus 200 GPa against 3.25 GPa for Plastic PLA, so the same part in Stainless 316 deflects less under the same load.
Which is lighter for the same job, Plastic PLA or Stainless 316?
For the same stiffness or strength: Plastic PLA is lighter for a stiff panel or plate, strong rod or tie, strong beam, strong panel or plate; Stainless 316 is lighter for a stiff rod or tie (tension), stiff beam (bending).
| Part that must be | Plastic PLA | Stainless 316 |
|---|---|---|
| Stiff rod or tie (tension) | 9.51x heavier | lighter |
| Stiff beam (bending) | 21% heavier | lighter |
| Stiff panel or plate | lighter | 1.64x heavier |
| Strong rod or tie | lighter | 28% heavier |
| Strong beam | lighter | 2.2x heavier |
| Strong panel or plate | lighter | 2.88x 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, Plastic PLA or Stainless 316?
Stainless 316 conducts heat better: 14.6 W/m·K against 0.13 W/m·K for Plastic PLA.