Materials / Compare
Nickel Inconel 718 vs. Plastic PBT GF30
Compare Nickel Inconel 718 vs. Plastic PBT GF30 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 | not given (tensile used) |
| Ultimate tensile strength | 1,389MPasourcetypical, 1.0 in. bar | 140MPasourcestress at break, 23 °C |
| Flexural strength | not sourced | 210MPasourcetypical, 23 °C |
| Elongation at break | 20%sourcetypical, 1.0 in. bar | 3%sourcestrain at break, 23 °C |
| Young's modulus (stiffness) | 200GPasourcetypical, 21 °C, annealed + aged | 9.8GPasourcetypical, 23 °C |
| Density | 8,221kg/m³sourcenominal, annealed and aged | 1,530kg/m³sourcetypical |
| Strength to weight | 147kN·m/kg1.6x higher | 91.5kN·m/kg |
| Stiffness to weight | 24.3MN·m/kg3.8x higher | 6.41MN·m/kg |
| Poisson's ratio | 0.294sourcetypical, 21 °C, annealed + aged | not sourced |
| Shear modulus | 77.3GPa | not sourced |
| Bulk modulus | 162GPa | not sourced |
| Speed of sound | 4,932m/s | 2,531m/s |
| Thermal | ||
| Thermal conductivity | 11.4W/m·Ksourcetypical, 21 °C, annealed + aged (calculated from resistivity per footnote a) | 0.27W/m·Ksourcetypical (DIN 52612-1) |
| Thermal expansion | 13.2µm/m·Ksourcetypical, mean 21-93 °C, annealed + aged | 25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C |
| 100 mm part over a 50 °C swing | 66µm growth1.89x less | 125µm growth |
| Specific heat | 435J/kg·Ksourcetypical, 21 °C | 1,050J/kg·Ksourcetypical, 23 °C |
| Heats up and cools (diffusivity) | 3.19mm²/s19x faster | 0.168mm²/s |
| Thermal shock resistance | 3,680W/m | not sourced |
| Melting point | 1,260–1,336°Csourcemelting range | 223°CsourceDSC (ISO 11357) |
| Max service temperature | 704°Csourceupper use temperature stated by producer | 205°CsourceHDT 1.8 MPa |
| 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 | BASF Ultradur B 4300 G6 (PBT, 30% glass fibre), injection moulding grade; product information sheet 09/2026, typical values for uncoloured product at 23 °C. |
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 PBT GF30?
Nickel Inconel 718 is stronger: its yield strength is 1,207 MPa against tensile strength 140 MPa for Plastic PBT GF30 (8.62x).
Which is lighter, Nickel Inconel 718 or Plastic PBT GF30?
Plastic PBT GF30 is lighter: 1,530 kg/m³ against 8,221 kg/m³ for Nickel Inconel 718.
Which is stiffer, Nickel Inconel 718 or Plastic PBT GF30?
Nickel Inconel 718 is stiffer: Young's modulus 200 GPa against 9.8 GPa for Plastic PBT GF30, 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 PBT GF30?
For the same stiffness or strength: Nickel Inconel 718 is lighter for a stiff rod or tie (tension), strong rod or tie; Plastic PBT GF30 is lighter for a stiff beam (bending), stiff panel or plate, strong beam, strong panel or plate.
| Part that must be | Nickel Inconel 718 | Plastic PBT GF30 |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 3.8x heavier |
| Stiff beam (bending) | 19% heavier | lighter |
| Stiff panel or plate | 1.97x heavier | lighter |
| Strong rod or tie | lighter | 1.6x heavier |
| Strong beam | 28% heavier | lighter |
| Strong panel or plate | 1.83x 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 PBT GF30?
Nickel Inconel 718 conducts heat better: 11.4 W/m·K against 0.27 W/m·K for Plastic PBT GF30.
Which expands less with temperature?
Nickel Inconel 718 expands less: 13.2 µm/m·K against 25 µm/m·K for Plastic PBT GF30.