Plastic PETG vs. SLA Resin Tough 2000

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

SLA Resin Tough 20003D printed (SLA resin)

Mechanical	Plastic PETG	SLA Resin Tough 2000
Yield strength	46.2MPa114% stronger	40.4MPa2
Ultimate tensile strength	46.2MPa114% stronger	40.4MPa2
Flexural strength	78.9MPa118% stronger in bending	67MPa2
Elongation at break	7.6%1	79%210.4x more ductile
Young's modulus (stiffness)	1.94GPa1	1.8GPa2
Density	1,270kg/m³1	1,090kg/m³217% lighter
Strength to weight	36.4kN·m/kg	37.1kN·m/kg2% higher
Stiffness to weight	1.53MN·m/kg	1.65MN·m/kg8% higher
Poisson's ratio	not sourced	not sourced
Shear modulus	not sourced	not sourced
Bulk modulus	not sourced	not sourced
Speed of sound	1,236m/s	1,285m/s4% faster

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal	Plastic PETG	SLA Resin Tough 2000
Thermal conductivity	base material0.21W/m·K3	not sourced
Thermal expansion	base material51µm/m·K32.63x less	mean 0-150 °C134µm/m·K2
100 mm part over a 50 °C swing	255µm growth2.63x less	671µm growth
Specific heat	base material1,300J/kg·K3	not sourced
Heats up and cools (diffusivity)	0.127mm²/s	not sourced
Thermal shock resistance	not sourced	not sourced
Glass transition	77.4°C1	DMA112°C234.8 °C higher
Max service temperature	HDT 0.455 MPa76.2°C1	HDT 1.8 MPa57°C2

Thermal conductivity against densityHigher and further left: spreads more heat for its weight

Thermal expansion against thermal conductivityLower and further right: warps less when heated

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Sources3 documents: UltiMaker, Formlabs, Eastman

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.
SLA Resin Tough 2000: 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.

1
Ultimaker PETG Technical Data Sheet, v1.00UltiMakerarchived copyPlastic PETG · Yield strength: typicalPlastic PETG · Ultimate tensile strength: typical, peak stress (= stress at yield)Plastic PETG · Flexural strength: typicalPlastic PETG · Elongation at break: typicalPlastic PETG · Young's modulus (stiffness): typicalPlastic PETG · Density: typicalPlastic PETG · Glass transition: typicalPlastic PETG · Max service temperature: HDT 0.455 MPa (printed specimens)
2
Tough 2000 Resin V2 Technical Data Sheet (2025)Formlabsarchived copySLA Resin Tough 2000 · Yield strength: typicalSLA Resin Tough 2000 · Ultimate tensile strength: typicalSLA Resin Tough 2000 · Flexural strength: typicalSLA Resin Tough 2000 · Elongation at break: typicalSLA Resin Tough 2000 · Young's modulus (stiffness): typicalSLA Resin Tough 2000 · Density: typicalSLA Resin Tough 2000 · Thermal expansion: mean 0-150 °CSLA Resin Tough 2000 · Glass transition: DMASLA Resin Tough 2000 · Max service temperature: HDT 1.8 MPa
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 SLA Resin Tough 2000 are 3D printed: their properties depend on build direction and print settings; these are typical values.

Questions

Mechanical

Is Plastic PETG stronger than SLA Resin Tough 2000?

Plastic PETG is stronger: its yield strength is 46.2 MPa against 40.4 MPa for SLA Resin Tough 2000 (14%).

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

SLA Resin Tough 2000 is lighter: 1,090 kg/m³ against 1,270 kg/m³ for Plastic PETG.

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

Plastic PETG is stiffer: Young's modulus 1.94 GPa against 1.8 GPa for SLA Resin Tough 2000, so the same part in Plastic PETG deflects less under the same load.

Which is lighter for the same job, Plastic PETG or SLA Resin Tough 2000?

For the same stiffness or strength: SLA Resin Tough 2000 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	SLA Resin Tough 2000
Stiff rod or tie (tension)	8% heavier	lighter
Stiff beam (bending)	12% heavier	lighter
Stiff panel or plate	14% heavier	lighter
Strong rod or tie	2% heavier	lighter
Strong beam	7% heavier	lighter
Strong panel or plate	9% 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 SLA Resin Tough 2000?

SLA Resin Tough 2000 stretches further before it breaks: 79% elongation at break against 7.6% for Plastic PETG.

Thermal

Which expands less with temperature?

Plastic PETG expands less: 51 µm/m·K against 134 µm/m·K for SLA Resin Tough 2000.