Annealed soda-lime-silica float glass, Pilkington North America Technical Bulletin ATS-129 (04/2025)
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 Glass stronger than Plastic PPS GF40?
Plastic PPS GF40 is stronger: its tensile strength is 195 MPa against 41 MPa for Glass (4.76x).
Which is lighter, Glass or Plastic PPS GF40?
Plastic PPS GF40 is lighter: 1,650 kg/m³ against 2,500 kg/m³ for Glass.
Which is stiffer, Glass or Plastic PPS GF40?
Glass is stiffer: Young's modulus 72 GPa against 14.7 GPa for Plastic PPS GF40, so the same part in Glass deflects less under the same load.
Which is lighter for the same job, Glass or Plastic PPS GF40?
For the same stiffness or strength: Glass is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Plastic PPS GF40 is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Glass
Plastic PPS GF40
Stiff rod or tie (tension)
lighter
3.23x heavier
Stiff beam (bending)
lighter
46% heavier
Stiff panel or plate
lighter
12% heavier
Strong rod or tie
7.21x heavier
lighter
Strong beam
4.29x heavier
lighter
Strong panel or plate
3.3x 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 conducts heat better, Glass or Plastic PPS GF40?
Glass conducts heat better: 0.937 W/m·K against 0.2 W/m·K for Plastic PPS GF40.
Which expands less with temperature?
Glass expands less: 8.3 µm/m·K against 12 µm/m·K for Plastic PPS GF40.