Materials / Compare
Plastic PETG vs. Plastic PPS GF40
Compare Plastic PETG vs. Plastic PPS GF40 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 | 46.2MPasourcetypical | not given (tensile used) |
| Ultimate tensile strength | 46.2MPasourcetypical, peak stress (= stress at yield) | 195MPasourcetensile strength, 5 mm/min |
| Flexural strength | 78.9MPasourcetypical | 285MPasourceflexural strength at break |
| Elongation at break | 7.6%sourcetypical | 1.9%sourcestrain at break, 5 mm/min |
| Young's modulus (stiffness) | 1.94GPasourcetypical | 14.7GPasourcetypical, 1 mm/min |
| Density | 1,270kg/m³sourcetypical30% lighter | 1,650kg/m³sourcetypical |
| Strength to weight | 36.4kN·m/kg | 118kN·m/kg3.25x higher |
| Stiffness to weight | 1.53MN·m/kg | 8.91MN·m/kg5.84x higher |
| Poisson's ratio | not sourced | 0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific) |
| Shear modulus | not sourced | 5.44GPa |
| Bulk modulus | not sourced | 16.3GPa |
| Speed of sound | 1,236m/s | 2,985m/s |
| Thermal | ||
| Thermal conductivity | 0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical | 0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific) |
| Thermal expansion | 51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical | 12µm/m·Ksourceparallel (flow), mean -50 to 90 °C |
| 100 mm part over a 50 °C swing | 255µm growth | 60µm growth4.25x less |
| Specific heat | 1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed) | not sourced |
| Heats up and cools (diffusivity) | 0.127mm²/s | not sourced |
| Thermal shock resistance | not sourced | 144W/m |
| Melting point | not sourced | 280°CsourceDSC, 10 °C/min |
| Glass transition | 77.4°Csourcetypical | 90°CsourceDSC, 10 °C/min |
| Max service temperature | 76.2°CsourceHDT 0.455 MPa (printed specimens) | 270°CsourceHDT 1.8 MPa |
| Values for | Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022. | 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.
Plastic PETG is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic PETG stronger than Plastic PPS GF40?
Plastic PPS GF40 is stronger: its tensile strength is 195 MPa against yield strength 46.2 MPa for Plastic PETG (4.22x).
Which is lighter, Plastic PETG or Plastic PPS GF40?
Plastic PETG is lighter: 1,270 kg/m³ against 1,650 kg/m³ for Plastic PPS GF40.
Which is stiffer, Plastic PETG or Plastic PPS GF40?
Plastic PPS GF40 is stiffer: Young's modulus 14.7 GPa against 1.94 GPa for Plastic PETG, so the same part in Plastic PPS GF40 deflects less under the same load.
Which is lighter for the same job, Plastic PETG 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 PETG | Plastic PPS GF40 |
|---|---|---|
| Stiff rod or tie (tension) | 5.84x heavier | lighter |
| Stiff beam (bending) | 2.12x heavier | lighter |
| Stiff panel or plate | 1.51x heavier | lighter |
| Strong rod or tie | 3.25x heavier | lighter |
| Strong beam | 2.01x heavier | lighter |
| Strong panel or plate | 1.58x 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, Plastic PETG or Plastic PPS GF40?
Plastic PETG conducts heat better: 0.21 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 51 µm/m·K for Plastic PETG.