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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Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07)
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.
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VICTREX PEEK 450G Technical Data SheetVictrexPlastic PEEK · Yield strength: typical, tensile yieldPlastic PEEK · Compressive strength: typical, 23 CPlastic PEEK · Flexural strength: typical, flexural stress at yield, 23 CPlastic PEEK · Elongation at break: typical, at breakPlastic PEEK · Young's modulus (stiffness): typical (nominal)Plastic PEEK · Density: typical (crystalline)Plastic PEEK · Thermal conductivity: typical, average, 23 CPlastic PEEK · Thermal expansion: average of flow/cross-flow, below Tg (<143 C)Plastic PEEK · Melting point: typical, DSCPlastic PEEK · Glass transition: onset (midpoint 150 C)Plastic PEEK · Max service temperature: UL 746B RTI, mechanical strength (continuous use index)
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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
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VICTREX PEEK for Use in Fluid Management (2020)VictrexPlastic PEEK · Poisson's ratio: typical
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VICTREX PEEK 450G Technical Data Sheet (2012)Victrexarchived copyPlastic PEEK · Specific heat: typical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012)
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.
SLS PA12 Nylon is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Mechanical
Is Plastic PEEK stronger than SLS PA12 Nylon?
Plastic PEEK is stronger: its yield strength is 98 MPa against tensile strength 48 MPa for SLS PA12 Nylon (2.04x).
Which is lighter, Plastic PEEK or SLS PA12 Nylon?
SLS PA12 Nylon is lighter: 930 kg/m³ against 1,300 kg/m³ for Plastic PEEK.
Which is stiffer, Plastic PEEK or SLS PA12 Nylon?
Plastic PEEK is stiffer: Young's modulus 4 GPa against 1.65 GPa for SLS PA12 Nylon, so the same part in Plastic PEEK deflects less under the same load.
Which is lighter for the same job, Plastic PEEK or SLS PA12 Nylon?
For the same stiffness or strength: Plastic PEEK is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam, strong panel or plate; SLS PA12 Nylon is lighter for a stiff panel or plate.
Part that must be
Plastic PEEK
SLS PA12 Nylon
Stiff rod or tie (tension)
lighter
1.73x heavier
Stiff beam (bending)
lighter
11% heavier
Stiff panel or plate
4% heavier
lighter
Strong rod or tie
lighter
46% heavier
Strong beam
lighter
15% heavier
Strong panel or plate
lighter
2% 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 PEEK or SLS PA12 Nylon?
Plastic PEEK stretches further before it breaks: 25% elongation at break against 18% for SLS PA12 Nylon.