Materials / Compare
Plastic PPS GF40 vs. Stainless Steel 17-4PH
Compare Plastic PPS GF40 vs. Stainless Steel 17-4PH strength, stiffness, weight and thermal properties.
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|---|---|---|
| Mechanical | ||
| Yield strength | not given (tensile used) | 1,275MPasourcetypical, transverse, sheet/strip |
| Ultimate tensile strength | 195MPasourcetensile strength, 5 mm/min | 1,379MPasourcetypical, transverse, sheet/strip |
| Flexural strength | 285MPasourceflexural strength at break | not sourced |
| Elongation at break | 1.9%sourcestrain at break, 5 mm/min | 9%sourcetypical, transverse, in 2 in. (50.8 mm) |
| Young's modulus (stiffness) | 14.7GPasourcetypical, 1 mm/min | 197GPasourceH 900 |
| Density | 1,650kg/m³sourcetypical | 7,800kg/m³sourceH 900 |
| Strength to weight | 118kN·m/kg | 163kN·m/kg38% higher |
| Stiffness to weight | 8.91MN·m/kg | 25.3MN·m/kg2.83x higher |
| Poisson's ratio | 0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific) | 0.272sourceH 900 (column) |
| Shear modulus | 5.44GPa | 77.4GPa14.2x stiffer in shear |
| Bulk modulus | 16.3GPa | 144GPa |
| Speed of sound | 2,985m/s | 5,026m/s |
| Thermal | ||
| Thermal conductivity | 0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific) | 17.9W/m·Ksourceat 149 °C (300 °F), H 900 |
| Thermal expansion | 12µm/m·Ksourceparallel (flow), mean -50 to 90 °C | 10.8µm/m·Ksourcemean, 21–93 °C (70–200 °F), H 900 |
| 100 mm part over a 50 °C swing | 60µm growth | 54µm growth11% less |
| Specific heat | not sourced | 460J/kg·Ksourcemean, 0–100 °C, H 900 |
| Heats up and cools (diffusivity) | not sourced | 4.99mm²/s |
| Thermal shock resistance | 144W/m | 7,809W/m54.3x more resistant |
| Melting point | 280°CsourceDSC, 10 °C/min | not sourced |
| Glass transition | 90°CsourceDSC, 10 °C/min | not sourced |
| Max service temperature | 270°CsourceHDT 1.8 MPa | 316°Csourcestrength-retention limit (not oxidation) |
| Values for | Celanese Fortron 1140L4 (PPS, 40% glass fibre), injection moulding; FORTRON PPS Short-Term Properties Guide (PPS-012, 2016); thermal conductivity and Poisson for 40% glass-reinforced Fortron from the Fortron PPS Design Manual (PPS-050, 2013). | Cleveland-Cliffs 17-4 PH, Condition H 900, sheet/strip, transverse (Product Data Bulletin, May 2021) |
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 Plastic PPS GF40 stronger than Stainless Steel 17-4PH?
Stainless Steel 17-4PH is stronger: its yield strength is 1,275 MPa against tensile strength 195 MPa for Plastic PPS GF40 (6.54x).
Which is lighter, Plastic PPS GF40 or Stainless Steel 17-4PH?
Plastic PPS GF40 is lighter: 1,650 kg/m³ against 7,800 kg/m³ for Stainless Steel 17-4PH.
Which is stiffer, Plastic PPS GF40 or Stainless Steel 17-4PH?
Stainless Steel 17-4PH is stiffer: Young's modulus 197 GPa against 14.7 GPa for Plastic PPS GF40, so the same part in Stainless Steel 17-4PH deflects less under the same load.
Which is lighter for the same job, Plastic PPS GF40 or Stainless Steel 17-4PH?
For the same stiffness or strength: Plastic PPS GF40 is lighter for a stiff beam (bending), stiff panel or plate, strong beam, strong panel or plate; Stainless Steel 17-4PH is lighter for a stiff rod or tie (tension), strong rod or tie.
| Part that must be | Plastic PPS GF40 | Stainless Steel 17-4PH |
|---|---|---|
| Stiff rod or tie (tension) | 2.83x heavier | lighter |
| Stiff beam (bending) | lighter | 29% heavier |
| Stiff panel or plate | lighter | 1.99x heavier |
| Strong rod or tie | 38% heavier | lighter |
| Strong beam | lighter | 35% heavier |
| Strong panel or plate | lighter | 1.85x 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 PPS GF40 or Stainless Steel 17-4PH?
Stainless Steel 17-4PH conducts heat better: 17.9 W/m·K against 0.2 W/m·K for Plastic PPS GF40.
Which expands less with temperature?
Stainless Steel 17-4PH expands less: 10.8 µm/m·K against 12 µm/m·K for Plastic PPS GF40.
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