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.
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).
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 PBT GF30 stronger than Plastic PPS GF40?
Plastic PPS GF40 is stronger: its tensile strength is 195 MPa against 140 MPa for Plastic PBT GF30 (39%).
Which is lighter, Plastic PBT GF30 or Plastic PPS GF40?
Plastic PBT GF30 is lighter: 1,530 kg/m³ against 1,650 kg/m³ for Plastic PPS GF40.
Which is stiffer, Plastic PBT GF30 or Plastic PPS GF40?
Plastic PPS GF40 is stiffer: Young's modulus 14.7 GPa against 9.8 GPa for Plastic PBT GF30, so the same part in Plastic PPS GF40 deflects less under the same load.
Which is lighter for the same job, Plastic PBT GF30 or Plastic PPS GF40?
For the same stiffness or strength: Plastic PPS GF40 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Plastic PBT GF30
Plastic PPS GF40
Stiff rod or tie (tension)
39% heavier
lighter
Stiff beam (bending)
14% heavier
lighter
Stiff panel or plate
6% heavier
lighter
Strong rod or tie
29% heavier
lighter
Strong beam
16% heavier
lighter
Strong panel or plate
9% 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 handles higher temperatures, Plastic PBT GF30 or Plastic PPS GF40?
Plastic PPS GF40 does: 270 °C against 205 °C for Plastic PBT GF30, both HDT 1.8 MPa.
Which conducts heat better, Plastic PBT GF30 or Plastic PPS GF40?
Plastic PBT GF30 conducts heat better: 0.27 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 25 µm/m·K for Plastic PBT GF30.