Magnesium AZ91D vs. SLA Resin Tough 2000

Compare Magnesium AZ91D vs. SLA Resin Tough 2000 strength, stiffness, weight and thermal properties.

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SLA Resin Tough 20003D printed (SLA resin)

Mechanical
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Yield strength	150MPasourcetypical, 0.2% tensile yield, ambient temperature	40.4MPasourcetypical
Ultimate tensile strength	230MPasourcetypical, ambient temperature	40.4MPasourcetypical
Flexural strength	not sourced	67MPasourcetypical
Elongation at break	3%sourcetypical, ambient temperature	79%sourcetypical
Young's modulus (stiffness)	45GPasourcetypical25x stiffer	1.8GPasourcetypical
Density	1,810kg/m³sourcetypical	1,090kg/m³sourcetypical1.66x lighter
Strength to weight	82.9kN·m/kg2.24x higher	37.1kN·m/kg
Stiffness to weight	24.9MN·m/kg15.1x higher	1.65MN·m/kg
Poisson's ratio	0.35sourcebase material: AZ91C casting (MIL-HDBK-5J handbook physical constant)	not sourced
Shear modulus	16.7GPa	not sourced
Bulk modulus	50GPa	not sourced
Speed of sound	4,986m/s	1,285m/s
Thermal
Thermal conductivity	72W/m·Ksourcetypical	not sourced
Thermal expansion	25µm/m·Ksourcetypical, temperature range not stated	134µm/m·Ksourcemean 0-150 °C
100 mm part over a 50 °C swing	125µm growth5.37x less	671µm growth
Specific heat	1,050J/kg·Ksourcetypical	not sourced
Heats up and cools (diffusivity)	37.9mm²/s	not sourced
Thermal shock resistance	6,240W/m	not sourced
Melting point	470–595°Csourcemelting range	not sourced
Glass transition	not sourced	112°CsourceDMA
Max service temperature	not sourced	57°CsourceHDT 1.8 MPa
Values for	ELEKTRON AZ91D magnesium die-casting alloy, as cast; Magnesium Elektron datasheet 475 (7/01), typical properties; Poisson from MIL-HDBK-5J for AZ91C castings.	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 Magnesium AZ91D stronger than SLA Resin Tough 2000?

Magnesium AZ91D is stronger: its yield strength is 150 MPa against 40.4 MPa for SLA Resin Tough 2000 (3.71x).

Which is lighter, Magnesium AZ91D or SLA Resin Tough 2000?

SLA Resin Tough 2000 is lighter: 1,090 kg/m³ against 1,810 kg/m³ for Magnesium AZ91D.

Which is stiffer, Magnesium AZ91D or SLA Resin Tough 2000?

Magnesium AZ91D is stiffer: Young's modulus 45 GPa against 1.8 GPa for SLA Resin Tough 2000, so the same part in Magnesium AZ91D deflects less under the same load.

Which is lighter for the same job, Magnesium AZ91D or SLA Resin Tough 2000?

For the same stiffness or strength: Magnesium AZ91D 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	Magnesium AZ91D	SLA Resin Tough 2000
Stiff rod or tie (tension)	lighter	15.1x heavier
Stiff beam (bending)	lighter	3.01x heavier
Stiff panel or plate	lighter	1.76x heavier
Strong rod or tie	lighter	2.24x heavier
Strong beam	lighter	44% heavier
Strong panel or plate	lighter	16% 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?

Magnesium AZ91D expands less: 25 µm/m·K against 134 µm/m·K for SLA Resin Tough 2000.

Among 72 materials

Stiffness against density

Strength against density