SLA Resin Tough 2000 vs. Steel AISI 4340

Compare SLA Resin Tough 2000 vs. Steel AISI 4340 strength, stiffness, weight and thermal properties.

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SLA Resin Tough 20003D printed (SLA resin)

Mechanical
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Yield strength	40.4MPasourcetypical	1,035MPasourcetypical, transverse
Ultimate tensile strength	40.4MPasourcetypical	1,140MPasourcetypical, transverse
Flexural strength	67MPasourcetypical	not sourced
Elongation at break	79%sourcetypical	18%sourcetypical, transverse
Young's modulus (stiffness)	1.8GPasourcetypical	200GPasourceMIL-HDBK-5J design value (AISI 4340, quenched and tempered)
Density	1,090kg/m³sourcetypical7.19x lighter	7,840kg/m³sourcetypical
Strength to weight	37.1kN·m/kg	132kN·m/kg3.56x higher
Stiffness to weight	1.65MN·m/kg	25.5MN·m/kg15.4x higher
Poisson's ratio	not sourced	0.32sourceMIL-HDBK-5J design value (AISI 4340, quenched and tempered)
Shear modulus	not sourced	75.7GPa
Bulk modulus	not sourced	185GPa
Speed of sound	1,285m/s	5,049m/s
Thermal
Thermal conductivity	not sourced	37.5W/m·Ksourcetypical
Thermal expansion	134µm/m·Ksourcemean 0-150 °C	11.3µm/m·Ksourcemean, -18 to 93 °C
100 mm part over a 50 °C swing	671µm growth	56.5µm growth11.9x less
Specific heat	not sourced	448J/kg·Ksourcetypical
Heats up and cools (diffusivity)	not sourced	10.7mm²/s
Thermal shock resistance	not sourced	11,678W/m
Glass transition	112°CsourceDMA	not sourced
Max service temperature	57°CsourceHDT 1.8 MPa	not sourced
Values for	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.	Carpenter (Latrobe) Lescalloy 4340 VAC-ARC datasheet; mechanical row for 1100 °F temper; physical properties grade-level

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 SLA Resin Tough 2000 stronger than Steel AISI 4340?

Steel AISI 4340 is stronger: its yield strength is 1,035 MPa against 40.4 MPa for SLA Resin Tough 2000 (25.6x).

Which is lighter, SLA Resin Tough 2000 or Steel AISI 4340?

SLA Resin Tough 2000 is lighter: 1,090 kg/m³ against 7,840 kg/m³ for Steel AISI 4340.

Which is stiffer, SLA Resin Tough 2000 or Steel AISI 4340?

Steel AISI 4340 is stiffer: Young's modulus 200 GPa against 1.8 GPa for SLA Resin Tough 2000, so the same part in Steel AISI 4340 deflects less under the same load.

Which is lighter for the same job, SLA Resin Tough 2000 or Steel AISI 4340?

For the same stiffness or strength: SLA Resin Tough 2000 is lighter for a stiff panel or plate, strong panel or plate; Steel AISI 4340 is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam.

Part that must be	SLA Resin Tough 2000	Steel AISI 4340
Stiff rod or tie (tension)	15.4x heavier	lighter
Stiff beam (bending)	47% heavier	lighter
Stiff panel or plate	lighter	50% heavier
Strong rod or tie	3.56x heavier	lighter
Strong beam	21% heavier	lighter
Strong panel or plate	lighter	42% 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?

Steel AISI 4340 expands less: 11.3 µm/m·K against 134 µm/m·K for SLA Resin Tough 2000.

Among 59 materials

Stiffness against density

Strength against density