Materials / Compare
Plastic POM/Acetal vs. DMLS 17-4PH Stainless Steel
Compare Plastic POM/Acetal vs. DMLS 17-4PH Stainless Steel strength, stiffness, weight and thermal properties.
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|---|---|---|
| Mechanical | ||
| Yield strength | 69MPasourcetypical (single ASTM D638 tensile strength) | 861MPasourcemean, as built, horizontal (N=72) |
| Ultimate tensile strength | 69MPasourcetypical | 886MPasourcemean, as built, horizontal (N=72) |
| Compressive strength | 124MPasourcecompressive stress at 10% deformation | not sourced |
| Flexural strength | 99MPasourceflexural yield strength, typical | not sourced |
| Elongation at break | 75%sourcetypical | 19.9%sourcemean at break, as built, horizontal |
| Young's modulus (stiffness) | 2.8GPasourcetypical | 197GPasourcebase material: wrought 17-4 PH, Condition H 900 (Cleveland-Cliffs) |
| Density | 1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties') | 7,790kg/m³sourcemean part density (ISO 3369) |
| Strength to weight | 48.6kN·m/kg | 110kN·m/kg2.27x higher |
| Stiffness to weight | 1.97MN·m/kg | 25.3MN·m/kg12.8x higher |
| Poisson's ratio | 0.35sourcetypical | 0.272sourcebase material: wrought 17-4 PH, all conditions (Cleveland-Cliffs) |
| Shear modulus | 1.04GPa | 77.4GPa74.7x stiffer in shear |
| Bulk modulus | 3.11GPa | 144GPa |
| Speed of sound | 1,404m/s | 5,029m/s |
| Thermal | ||
| Thermal conductivity | 0.4W/m·Ksourcetypical | 17.9W/m·Ksourcebase material: wrought 17-4 PH, Condition H 900, at 149 °C (Cleveland-Cliffs) |
| Thermal expansion | 122µm/m·Ksourcemean, 29 to 60 °C | 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 | 610µm growth | 52µm growth11.7x less |
| Specific heat | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) | 460J/kg·Ksourcebase material: wrought 17-4 PH, Condition A, 0-100 °C (Cleveland-Cliffs) |
| Heats up and cools (diffusivity) | 0.192mm²/s | 5mm²/s26x faster |
| Thermal shock resistance | 52.5W/m | 5,474W/m104x more resistant |
| Melting point | 175°Csourcecrystalline melting point | not sourced |
| Max service temperature | 125°CsourceHDT 1.8 MPa (annealed) | not sourced |
| Values for | DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com | 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.
DMLS 17-4PH Stainless Steel is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic POM/Acetal stronger than DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel is stronger: its yield strength is 861 MPa against 69 MPa for Plastic POM/Acetal (12.5x).
Which is lighter, Plastic POM/Acetal or DMLS 17-4PH Stainless Steel?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 7,790 kg/m³ for DMLS 17-4PH Stainless Steel.
Which is stiffer, Plastic POM/Acetal or DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel is stiffer: Young's modulus 197 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in DMLS 17-4PH Stainless Steel deflects less under the same load.
Which is lighter for the same job, Plastic POM/Acetal or DMLS 17-4PH Stainless Steel?
For the same stiffness or strength: Plastic POM/Acetal is lighter for a stiff panel or plate, strong beam, 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.
| Part that must be | Plastic POM/Acetal | DMLS 17-4PH Stainless Steel |
|---|---|---|
| Stiff rod or tie (tension) | 12.8x heavier | lighter |
| Stiff beam (bending) | 1.53x heavier | lighter |
| Stiff panel or plate | lighter | 33% heavier |
| Strong rod or tie | 2.27x heavier | lighter |
| Strong beam | lighter | 2% heavier |
| Strong panel or plate | lighter | 1.55x 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 POM/Acetal or DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel conducts heat better: 17.9 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
DMLS 17-4PH Stainless Steel expands less: 10.4 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.
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