Plastic PEEK vs. SLA Resin Tough 2000

Compare Plastic PEEK vs. SLA Resin Tough 2000 strength, stiffness, weight and thermal properties.

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Plastic PEEKBulk polymer (molded or machined)

SLA Resin Tough 20003D printed (SLA resin)

Mechanical
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Yield strength	98MPasourcetypical, tensile yield	40.4MPasourcetypical
Ultimate tensile strength	not sourced	40.4MPasourcetypical
Compressive strength	125MPasourcetypical, 23 C	not sourced
Flexural strength	165MPasourcetypical, flexural stress at yield, 23 C	67MPasourcetypical
Elongation at break	25%sourcetypical, at break	79%sourcetypical
Young's modulus (stiffness)	4GPasourcetypical (nominal)	1.8GPasourcetypical
Density	1,300kg/m³sourcetypical (crystalline)	1,090kg/m³sourcetypical
Strength to weight	75.4kN·m/kg2.03x higher	37.1kN·m/kg
Stiffness to weight	3.08MN·m/kg1.86x higher	1.65MN·m/kg
Poisson's ratio	0.38sourcetypical	not sourced
Shear modulus	1.45GPa	not sourced
Bulk modulus	5.56GPa	not sourced
Speed of sound	1,754m/s	1,285m/s
Thermal
Thermal conductivity	0.29W/m·Ksourcetypical, average, 23 C	not sourced
Thermal expansion	55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C)	134µm/m·Ksourcemean 0-150 °C
100 mm part over a 50 °C swing	275µm growth2.44x less	671µm growth
Specific heat	2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012)	not sourced
Heats up and cools (diffusivity)	0.101mm²/s	not sourced
Thermal shock resistance	80.1W/m	not sourced
Melting point	343°Csourcetypical, DSC	not sourced
Glass transition	143°Csourceonset (midpoint 150 C)	112°CsourceDMA
Max service temperature	240°CsourceUL 746B RTI, mechanical strength (continuous use index)	57°CsourceHDT 1.8 MPa
Values for	Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07)	Formlabs Tough 2000 Resin V2 (FLTO2002), TDS Rev. 01 10/06/2025; printed on Form 4 at 100 µm, washed in Form Wash V2 10+5 min in >=99% IPA, post-cured 70 °C for 12 min in Form Cure V2. Orientation not stated.

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.

SLA Resin Tough 2000 is 3D printed: its properties depend on build direction and print settings; these are typical values.

Questions

Is Plastic PEEK stronger than SLA Resin Tough 2000?

Plastic PEEK is stronger: its yield strength is 98 MPa against 40.4 MPa for SLA Resin Tough 2000 (2.43x).

Which is lighter, Plastic PEEK or SLA Resin Tough 2000?

SLA Resin Tough 2000 is lighter: 1,090 kg/m³ against 1,300 kg/m³ for Plastic PEEK.

Which is stiffer, Plastic PEEK or SLA Resin Tough 2000?

Plastic PEEK is stiffer: Young's modulus 4 GPa against 1.8 GPa for SLA Resin Tough 2000, 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 Tough 2000?

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 Tough 2000
Stiff rod or tie (tension)	lighter	1.86x heavier
Stiff beam (bending)	lighter	25% heavier
Stiff panel or plate	lighter	9% heavier
Strong rod or tie	lighter	2.03x heavier
Strong beam	lighter	1.51x heavier
Strong panel or plate	lighter	31% 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 expands less with temperature?

Plastic PEEK expands less: 55 µm/m·K against 134 µm/m·K for SLA Resin Tough 2000.

Among 72 materials

Stiffness against density

Strength against density