Materials / Compare
Plastic ABS (bulk/injection) vs. Stainless 303
Compare Plastic ABS (bulk/injection) vs. Stainless 303 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 | 45MPasourcetypical, tensile stress at yield 23 °C | 275MPasourceOutokumpu typical (product P = hot rolled plate, transverse) |
| Ultimate tensile strength | not sourced | 585MPasourceOutokumpu typical |
| Flexural strength | 65MPasourcetypical, 23 °C | not sourced |
| Elongation at break | 10%sourcenominal strain at break, 23 °C | 35%sourceOutokumpu typical, A5 |
| Young's modulus (stiffness) | 2.3GPasourcetypical | 200GPasourceat RT (Table 12) |
| Density | 1,040kg/m³sourcetypical | 7,900kg/m³sourceat RT |
| Strength to weight | 43.3kN·m/kg24% higher | 34.8kN·m/kg |
| Stiffness to weight | 2.21MN·m/kg | 25.3MN·m/kg11.4x higher |
| Poisson's ratio | 0.39sourcetypical, ABS family (Covestro Part and Mold Design guide, Table 3-1) | 0.3sourcedesign value (structural stainless steels) |
| Shear modulus | 0.827GPa | 76.9GPa93x stiffer in shear |
| Bulk modulus | 3.48GPa | 167GPa |
| Speed of sound | 1,487m/s | 5,032m/s |
| Thermal | ||
| Thermal conductivity | 0.17W/m·Ksourcetypical | 15W/m·Ksourceat RT |
| Thermal expansion | 80–110µm/m·Ksourcerange | 16µm/m·Ksourcemean, 20–100 °C |
| 100 mm part over a 50 °C swing | 475µm growth | 80µm growth5.94x less |
| Specific heat | not sourced | 500J/kg·Ksourceat RT |
| Heats up and cools (diffusivity) | not sourced | 3.8mm²/s |
| Thermal shock resistance | 21.4W/m | 902W/m42.3x more resistant |
| Max service temperature | 94°CsourceHDT 1.8 MPa (annealed 4 h/80 °C) | 871°Csourcecontinuous, scaling limit |
| Values for | INEOS Styrolution Terluran GP-22 general-purpose injection-molding ABS, ISO typical values (TDS revision 08/01/2022) | 1.4305 / UNS S30300, Outokumpu typical values (hot rolled, solution annealed) from 'Steel Grades, Properties and Global Standards'; max service from Carpenter CarTech 303 datasheet |
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 ABS (bulk/injection) stronger than Stainless 303?
Stainless 303 is stronger: its yield strength is 275 MPa against 45 MPa for Plastic ABS (bulk/injection) (6.11x).
Which is lighter, Plastic ABS (bulk/injection) or Stainless 303?
Plastic ABS (bulk/injection) is lighter: 1,040 kg/m³ against 7,900 kg/m³ for Stainless 303.
Which is stiffer, Plastic ABS (bulk/injection) or Stainless 303?
Stainless 303 is stiffer: Young's modulus 200 GPa against 2.3 GPa for Plastic ABS (bulk/injection), so the same part in Stainless 303 deflects less under the same load.
Which is lighter for the same job, Plastic ABS (bulk/injection) or Stainless 303?
For the same stiffness or strength: Plastic ABS (bulk/injection) is lighter for a stiff panel or plate, strong rod or tie, strong beam, strong panel or plate; Stainless 303 is lighter for a stiff rod or tie (tension), stiff beam (bending).
| Part that must be | Plastic ABS (bulk/injection) | Stainless 303 |
|---|---|---|
| Stiff rod or tie (tension) | 11.4x heavier | lighter |
| Stiff beam (bending) | 23% heavier | lighter |
| Stiff panel or plate | lighter | 1.71x heavier |
| Strong rod or tie | lighter | 24% heavier |
| Strong beam | lighter | 2.27x heavier |
| Strong panel or plate | lighter | 3.07x 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 ABS (bulk/injection) or Stainless 303?
Stainless 303 conducts heat better: 15 W/m·K against 0.17 W/m·K for Plastic ABS (bulk/injection).
Which expands less with temperature?
Stainless 303 expands less: 16 µm/m·K against 95 µm/m·K for Plastic ABS (bulk/injection).