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)
SLA Resin Standard
Formlabs Clear Resin V5 (FLGPCL05), TDS Rev. 01 March 20, 2024; printed on Form 4 at 100 µm, washed 5 min in >=99% IPA, post-cured 15 min at 60 °C in Form Cure. Orientation not stated.
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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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Clear Resin V5 Technical Data Sheet (2024)Formlabsarchived copySLA Resin Standard · Ultimate tensile strength: typicalSLA Resin Standard · Flexural strength: typicalSLA Resin Standard · Elongation at break: typicalSLA Resin Standard · Young's modulus (stiffness): typicalSLA Resin Standard · Max service temperature: HDT 1.8 MPa
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Clear Resin V5 Technical Data Sheet (web edition)FormlabsSLA Resin Standard · Density: typical, post-cured (same for 5 min ambient and 15 min at 60 °C), ASTM D792
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VICTREX PEEK for Use in Fluid Management (2020)VictrexPlastic PEEK · Poisson's ratio: typical
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Thermal Properties of Selected Formlabs SLA ResinsFormlabsSLA Resin Standard · Thermal conductivity: typical, post-cured, ASTM E1530SLA Resin Standard · Thermal expansion: mean -30 to 140 °C, post-cured (5 min ambient cure), TMA ASTM E831SLA Resin Standard · Specific heat: typical, 25 °C, post-cured (5 min ambient cure), DSC ASTM E1269
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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.
SLA Resin Standard is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Mechanical
Is Plastic PEEK stronger than SLA Resin Standard?
Plastic PEEK is stronger: its yield strength is 98 MPa against tensile strength 60 MPa for SLA Resin Standard (1.63x).
Which is lighter, Plastic PEEK or SLA Resin Standard?
SLA Resin Standard is lighter: 1,210 kg/m³ against 1,300 kg/m³ for Plastic PEEK.
Which is stiffer, Plastic PEEK or SLA Resin Standard?
Plastic PEEK is stiffer: Young's modulus 4 GPa against 2.75 GPa for SLA Resin Standard, so the same part in Plastic PEEK deflects less under the same load.
Which is lighter for the same job, Plastic PEEK or SLA Resin Standard?
For the same stiffness or strength: Plastic PEEK 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 PEEK
SLA Resin Standard
Stiff rod or tie (tension)
lighter
35% heavier
Stiff beam (bending)
lighter
12% heavier
Stiff panel or plate
lighter
5% heavier
Strong rod or tie
lighter
1.52x heavier
Strong beam
lighter
29% heavier
Strong panel or plate
lighter
19% 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 SLA Resin Standard?
Plastic PEEK stretches further before it breaks: 25% elongation at break against 8% for SLA Resin Standard.
Thermal
Which conducts heat better, Plastic PEEK or SLA Resin Standard?
SLA Resin Standard conducts heat better: 0.54 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Plastic PEEK expands less: 55 µm/m·K against 114 µm/m·K for SLA Resin Standard.