Materials / Compare
Plastic PETG vs. DMLS 17-4PH Stainless Steel
Compare Plastic PETG vs. DMLS 17-4PH Stainless Steel 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 | 46.2MPasourcetypical | 861MPasourcemean, as built, horizontal (N=72) |
| Ultimate tensile strength | 46.2MPasourcetypical, peak stress (= stress at yield) | 886MPasourcemean, as built, horizontal (N=72) |
| Flexural strength | 78.9MPasourcetypical | not sourced |
| Elongation at break | 7.6%sourcetypical | 19.9%sourcemean at break, as built, horizontal |
| Young's modulus (stiffness) | 1.94GPasourcetypical | 197GPasourcebase material: wrought 17-4 PH, Condition H 900 (Cleveland-Cliffs) |
| Density | 1,270kg/m³sourcetypical | 7,790kg/m³sourcemean part density (ISO 3369) |
| Strength to weight | 36.4kN·m/kg | 110kN·m/kg3.04x higher |
| Stiffness to weight | 1.53MN·m/kg | 25.3MN·m/kg16.6x higher |
| Poisson's ratio | not sourced | 0.272sourcebase material: wrought 17-4 PH, all conditions (Cleveland-Cliffs) |
| Shear modulus | not sourced | 77.4GPa |
| Bulk modulus | not sourced | 144GPa |
| Speed of sound | 1,236m/s | 5,029m/s |
| Thermal | ||
| Thermal conductivity | 0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical | 17.9W/m·Ksourcebase material: wrought 17-4 PH, Condition H 900, at 149 °C (Cleveland-Cliffs) |
| Thermal expansion | 51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical | 10.4µm/m·Ksourcemean 25-100 °C, ASTM E228, AFTER atmospheric heat treatment (as-built value not published) |
| 100 mm part over a 50 °C swing | 255µm growth | 52µm growth4.9x less |
| Specific heat | 1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed) | 460J/kg·Ksourcebase material: wrought 17-4 PH, Condition A, 0-100 °C (Cleveland-Cliffs) |
| Heats up and cools (diffusivity) | 0.127mm²/s | 5mm²/s39.3x faster |
| Thermal shock resistance | not sourced | 5,474W/m |
| Glass transition | 77.4°Csourcetypical | not sourced |
| Max service temperature | 76.2°CsourceHDT 0.455 MPa (printed specimens) | not sourced |
| Values for | Ultimaker PETG, 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 v1.00, April 29, 2022. | EOS StainlessSteel 17-4PH IndustryLine (powder 9011-0041), EOS M 290, 40 µm, default job 17-4PH_040_StainlessM291_100, as built, horizontal; ISO 6892 & ASTM E8M |
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 PETG and DMLS 17-4PH Stainless Steel are 3D printed: their properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic PETG stronger than DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel is stronger: its yield strength is 861 MPa against 46.2 MPa for Plastic PETG (18.6x).
Which is lighter, Plastic PETG or DMLS 17-4PH Stainless Steel?
Plastic PETG is lighter: 1,270 kg/m³ against 7,790 kg/m³ for DMLS 17-4PH Stainless Steel.
Which is stiffer, Plastic PETG or DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel is stiffer: Young's modulus 197 GPa against 1.94 GPa for Plastic PETG, so the same part in DMLS 17-4PH Stainless Steel deflects less under the same load.
Which is lighter for the same job, Plastic PETG or DMLS 17-4PH Stainless Steel?
For the same stiffness or strength: Plastic PETG is lighter for a stiff panel or plate, strong panel or plate; DMLS 17-4PH Stainless Steel is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam.
| Part that must be | Plastic PETG | DMLS 17-4PH Stainless Steel |
|---|---|---|
| Stiff rod or tie (tension) | 16.6x heavier | lighter |
| Stiff beam (bending) | 1.64x heavier | lighter |
| Stiff panel or plate | lighter | 31% heavier |
| Strong rod or tie | 3.04x heavier | lighter |
| Strong beam | 15% heavier | lighter |
| Strong panel or plate | lighter | 42% 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 PETG or DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel conducts heat better: 17.9 W/m·K against 0.21 W/m·K for Plastic PETG.
Which expands less with temperature?
DMLS 17-4PH Stainless Steel expands less: 10.4 µm/m·K against 51 µm/m·K for Plastic PETG.
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