Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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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.
Plastic PETG
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.
Ultradur B 4300 G6 Product InformationBASFPlastic PBT GF30 · Ultimate tensile strength: stress at break, 23 °CPlastic PBT GF30 · Flexural strength: typical, 23 °CPlastic PBT GF30 · Elongation at break: strain at break, 23 °CPlastic PBT GF30 · Young's modulus (stiffness): typical, 23 °CPlastic PBT GF30 · Density: typicalPlastic PBT GF30 · Thermal conductivity: typical (DIN 52612-1)Plastic PBT GF30 · Thermal expansion: longitudinal (flow), mean 23-55 °CPlastic PBT GF30 · Specific heat: typical, 23 °CPlastic PBT GF30 · Melting point: DSC (ISO 11357)Plastic PBT GF30 · Max service temperature: HDT 1.8 MPa
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Eastar Copolyester 6763 Product Data SheetEastmanPlastic PETG · Thermal conductivity: base material: Eastman Eastar Copolyester 6763 (PETG), typicalPlastic PETG · Thermal expansion: base material: Eastman Eastar Copolyester 6763 (PETG), typicalPlastic PETG · Specific heat: base material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed)
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "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
Mechanical
Is Plastic PBT GF30 stronger than Plastic PETG?
Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 46.2 MPa for Plastic PETG (3.03x).
Which is lighter, Plastic PBT GF30 or Plastic PETG?
Plastic PETG is lighter: 1,270 kg/m³ against 1,530 kg/m³ for Plastic PBT GF30.
Which is stiffer, Plastic PBT GF30 or Plastic PETG?
Plastic PBT GF30 is stiffer: Young's modulus 9.8 GPa against 1.94 GPa for Plastic PETG, so the same part in Plastic PBT GF30 deflects less under the same load.
Which is lighter for the same job, Plastic PBT GF30 or Plastic PETG?
For the same stiffness or strength: Plastic PBT GF30 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 PETG
Stiff rod or tie (tension)
lighter
4.2x heavier
Stiff beam (bending)
lighter
1.87x heavier
Stiff panel or plate
lighter
42% heavier
Strong rod or tie
lighter
2.52x heavier
Strong beam
lighter
1.74x heavier
Strong panel or plate
lighter
44% 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 is more ductile, Plastic PBT GF30 or Plastic PETG?
Plastic PETG stretches further before it breaks: 7.6% elongation at break against 3% for Plastic PBT GF30.
Thermal
Which conducts heat better, Plastic PBT GF30 or Plastic PETG?
Plastic PBT GF30 conducts heat better: 0.27 W/m·K against 0.21 W/m·K for Plastic PETG.
Which expands less with temperature?
Plastic PBT GF30 expands less: 25 µm/m·K against 51 µm/m·K for Plastic PETG.