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).
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 PPS GF40 stronger than Stainless Steel 303?
Stainless Steel 303 is stronger: its yield strength is 275 MPa against tensile strength 195 MPa for Plastic PPS GF40 (41%).
Which is lighter, Plastic PPS GF40 or Stainless Steel 303?
Plastic PPS GF40 is lighter: 1,650 kg/m³ against 7,900 kg/m³ for Stainless Steel 303.
Which is stiffer, Plastic PPS GF40 or Stainless Steel 303?
Stainless Steel 303 is stiffer: Young's modulus 200 GPa against 14.7 GPa for Plastic PPS GF40, so the same part in Stainless Steel 303 deflects less under the same load.
Which is lighter for the same job, Plastic PPS GF40 or Stainless Steel 303?
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; Stainless Steel 303 is lighter for a stiff rod or tie (tension).
Part that must be
Plastic PPS GF40
Stainless Steel 303
Stiff rod or tie (tension)
2.84x heavier
lighter
Stiff beam (bending)
lighter
30% heavier
Stiff panel or plate
lighter
2.01x heavier
Strong rod or tie
lighter
3.4x heavier
Strong beam
lighter
3.81x heavier
Strong panel or plate
lighter
4.03x 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 303?
Stainless Steel 303 conducts heat better: 15 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 16 µm/m·K for Stainless Steel 303.