Materials / Compare
Plastic PPS GF40 vs. Steel AISI 1018
Compare Plastic PPS GF40 vs. Steel AISI 1018 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 | not given (tensile used) | 372MPasourceproducer-stated, cold drawn |
| Ultimate tensile strength | 195MPasourcetensile strength, 5 mm/min | 441MPasourceproducer-stated, cold drawn |
| Flexural strength | 285MPasourceflexural strength at break | not sourced |
| Elongation at break | 1.9%sourcestrain at break, 5 mm/min | 15%sourcein 2 in (50.8 mm) |
| Young's modulus (stiffness) | 14.7GPasourcetypical, 1 mm/min | 200GPasourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Density | 1,650kg/m³sourcetypical | 7,861kg/m³sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Strength to weight | 118kN·m/kg2.5x higher | 47.3kN·m/kg |
| Stiffness to weight | 8.91MN·m/kg | 25.4MN·m/kg2.85x higher |
| Poisson's ratio | 0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific) | 0.32sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Shear modulus | 5.44GPa | 75.7GPa13.9x stiffer in shear |
| Bulk modulus | 16.3GPa | 185GPa |
| Speed of sound | 2,985m/s | 5,043m/s |
| Thermal | ||
| Thermal conductivity | 0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific) | 51.9W/m·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Thermal expansion | 12µm/m·Ksourceparallel (flow), mean -50 to 90 °C | 12µm/m·Ksourcebase material: unalloyed carbon steel, Ovako family table (S275JR, 'none alloyed structural steels', C <= 0.21%); mean 20-300 °C |
| 100 mm part over a 50 °C swing | 60µm growth | 60µm growth |
| Specific heat | not sourced | 486J/kg·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Heats up and cools (diffusivity) | not sourced | 13.6mm²/s |
| Thermal shock resistance | 144W/m | 5,473W/m38.1x 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 | not sourced |
| 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). | AISI 1018 cold drawn bar (Niagara LaSalle, cold-finished bar producer) |
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 Steel AISI 1018?
Steel AISI 1018 is stronger: its yield strength is 372 MPa against tensile strength 195 MPa for Plastic PPS GF40 (1.91x).
Which is lighter, Plastic PPS GF40 or Steel AISI 1018?
Plastic PPS GF40 is lighter: 1,650 kg/m³ against 7,861 kg/m³ for Steel AISI 1018.
Which is stiffer, Plastic PPS GF40 or Steel AISI 1018?
Steel AISI 1018 is stiffer: Young's modulus 200 GPa against 14.7 GPa for Plastic PPS GF40, so the same part in Steel AISI 1018 deflects less under the same load.
Which is lighter for the same job, Plastic PPS GF40 or Steel AISI 1018?
For the same stiffness or strength: Plastic PPS GF40 is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate; Steel AISI 1018 is lighter for a stiff rod or tie (tension).
| Part that must be | Plastic PPS GF40 | Steel AISI 1018 |
|---|---|---|
| Stiff rod or tie (tension) | 2.85x heavier | lighter |
| Stiff beam (bending) | lighter | 29% heavier |
| Stiff panel or plate | lighter | 2x heavier |
| Strong rod or tie | lighter | 2.5x heavier |
| Strong beam | lighter | 3.1x heavier |
| Strong panel or plate | lighter | 3.45x 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 Steel AISI 1018?
Steel AISI 1018 conducts heat better: 51.9 W/m·K against 0.2 W/m·K for Plastic PPS GF40.
Which expands less with temperature?
Plastic PPS GF40 expands less: 12 µm/m·K against 12 µm/m·K for Steel AISI 1018.