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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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.
SLS PA12 Nylon
EOS PA 2200 (PA12) Material Data Sheet, process parameter 'Balance' at 120 µm layer thickness, X orientation, dry (conditioned values not given). Live MDS status 04.10.2026, last changed 10.09.2026; PDF via ?topdf=... link on the same page.
PA 2200 Balance Material Data SheetEOS GmbHSLS PA12 Nylon · Ultimate tensile strength: typicalSLS PA12 Nylon · Elongation at break: typicalSLS PA12 Nylon · Young's modulus (stiffness): typicalSLS PA12 Nylon · Density: typicalSLS PA12 Nylon · Melting point: typicalSLS PA12 Nylon · Max service temperature: HDT 1.8 MPa, X orientation
3
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 and SLS PA12 Nylon are 3D printed: their properties depend on build direction and print settings; these are typical values.
Questions
Mechanical
Is Plastic PETG stronger than SLS PA12 Nylon?
SLS PA12 Nylon is stronger: its tensile strength is 48 MPa against yield strength 46.2 MPa for Plastic PETG (4%).
Which is lighter, Plastic PETG or SLS PA12 Nylon?
SLS PA12 Nylon is lighter: 930 kg/m³ against 1,270 kg/m³ for Plastic PETG.
Which is stiffer, Plastic PETG or SLS PA12 Nylon?
Plastic PETG is stiffer: Young's modulus 1.94 GPa against 1.65 GPa for SLS PA12 Nylon, so the same part in Plastic PETG deflects less under the same load.
Which is lighter for the same job, Plastic PETG or SLS PA12 Nylon?
For the same stiffness or strength: SLS PA12 Nylon 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
SLS PA12 Nylon
Stiff rod or tie (tension)
16% heavier
lighter
Stiff beam (bending)
26% heavier
lighter
Stiff panel or plate
29% heavier
lighter
Strong rod or tie
42% heavier
lighter
Strong beam
40% heavier
lighter
Strong panel or plate
39% 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 is more ductile, Plastic PETG or SLS PA12 Nylon?
SLS PA12 Nylon stretches further before it breaks: 18% elongation at break against 7.6% for Plastic PETG.