Materials / Compare
Nickel Inconel 718 vs. Plastic POM/Acetal
Compare Nickel Inconel 718 vs. Plastic POM/Acetal 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 | 1,207MPasourcetypical, 1.0 in. hot-rolled bar, 0.2% offset | 69MPasourcetypical (single ASTM D638 tensile strength) |
| Ultimate tensile strength | 1,389MPasourcetypical, 1.0 in. bar | 69MPasourcetypical |
| Compressive strength | not sourced | 124MPasourcecompressive stress at 10% deformation |
| Flexural strength | not sourced | 99MPasourceflexural yield strength, typical |
| Elongation at break | 20%sourcetypical, 1.0 in. bar | 75%sourcetypical |
| Young's modulus (stiffness) | 200GPasourcetypical, 21 °C, annealed + aged | 2.8GPasourcetypical |
| Density | 8,221kg/m³sourcenominal, annealed and aged | 1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties') |
| Strength to weight | 147kN·m/kg3.02x higher | 48.6kN·m/kg |
| Stiffness to weight | 24.3MN·m/kg12.3x higher | 1.97MN·m/kg |
| Poisson's ratio | 0.294sourcetypical, 21 °C, annealed + aged | 0.35sourcetypical |
| Shear modulus | 77.3GPa74.5x stiffer in shear | 1.04GPa |
| Bulk modulus | 162GPa | 3.11GPa |
| Speed of sound | 4,932m/s | 1,404m/s |
| Thermal | ||
| Thermal conductivity | 11.4W/m·Ksourcetypical, 21 °C, annealed + aged (calculated from resistivity per footnote a) | 0.4W/m·Ksourcetypical |
| Thermal expansion | 13.2µm/m·Ksourcetypical, mean 21-93 °C, annealed + aged | 122µm/m·Ksourcemean, 29 to 60 °C |
| 100 mm part over a 50 °C swing | 66µm growth9.24x less | 610µm growth |
| Specific heat | 435J/kg·Ksourcetypical, 21 °C | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) |
| Heats up and cools (diffusivity) | 3.19mm²/s16.6x faster | 0.192mm²/s |
| Thermal shock resistance | 3,680W/m70.1x more resistant | 52.5W/m |
| Melting point | 1,260–1,336°Csourcemelting range | 175°Csourcecrystalline melting point |
| Max service temperature | 704°Csourceupper use temperature stated by producer | 125°CsourceHDT 1.8 MPa (annealed) |
| Values for | INCONEL alloy 718, standard grade, 1750 °F/1 hr anneal + 1325 °F/8 hr F.C. to 1150 °F aged; Special Metals bulletin SMC-045 typical values | DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com |
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 Nickel Inconel 718 stronger than Plastic POM/Acetal?
Nickel Inconel 718 is stronger: its yield strength is 1,207 MPa against 69 MPa for Plastic POM/Acetal (17.5x).
Which is lighter, Nickel Inconel 718 or Plastic POM/Acetal?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 8,221 kg/m³ for Nickel Inconel 718.
Which is stiffer, Nickel Inconel 718 or Plastic POM/Acetal?
Nickel Inconel 718 is stiffer: Young's modulus 200 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Nickel Inconel 718 deflects less under the same load.
Which is lighter for the same job, Nickel Inconel 718 or Plastic POM/Acetal?
For the same stiffness or strength: Nickel Inconel 718 is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam; Plastic POM/Acetal is lighter for a stiff panel or plate, strong panel or plate.
| Part that must be | Nickel Inconel 718 | Plastic POM/Acetal |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 12.3x heavier |
| Stiff beam (bending) | lighter | 46% heavier |
| Stiff panel or plate | 40% heavier | lighter |
| Strong rod or tie | lighter | 3.02x heavier |
| Strong beam | lighter | 16% heavier |
| Strong panel or plate | 38% 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).
Which conducts heat better, Nickel Inconel 718 or Plastic POM/Acetal?
Nickel Inconel 718 conducts heat better: 11.4 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Nickel Inconel 718 expands less: 13.2 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.
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