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Plastic HDPE vs. SLA Resin Elastic 50A

Compare Plastic HDPE vs. SLA Resin Elastic 50A strength, stiffness, weight and thermal properties.

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Plastic HDPEBulk polymer (molded or machined)
SLA Resin Elastic 50A3D printed (SLA resin)
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Mechanical
Yield strength24MPasourcetypical, tensile stress at yield 23 °C, 50 mm/min ISO 527not given (tensile used)
Ultimate tensile strengthnot sourced3.4MPasourcetypical
Elongation at breaknot sourced160%sourcetypical
Young's modulus (stiffness)0.9GPasourcetypical, tensile modulus 23 °C ISO 527not sourced
Density950kg/m³sourcetypical, ISO 11831,010kg/m³sourcetypical
Strength to weight25.3kN·m/kg7.5x higher3.37kN·m/kg
Stiffness to weight0.947MN·m/kgnot sourced
Poisson's ratio0.4–0.45sourcebase material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)not sourced
Shear modulus0.316GPanot sourced
Bulk modulus2GPanot sourced
Speed of sound973m/snot sourced
Thermal
Thermal conductivity0.4–0.49W/m·Ksourcebase material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)not sourced
Thermal expansion120µm/m·Ksourcebase material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)not sourced
100 mm part over a 50 °C swing600µm growthnot sourced
Specific heat2,250J/kg·Ksourcebase material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)not sourced
Heats up and cools (diffusivity)0.208mm²/snot sourced
Thermal shock resistance56.9W/mnot sourced
Glass transitionnot sourced-34.5°CsourceDMA
Values forLyondellBasell Hostalen 23050 B high density polyethylene, typical ISO valuesFormlabs Elastic 50A Resin V2 (FLELCL02), TDS Rev. 01 24.01.2024; parts printed on Form 3, 100 µm, Elastic 50A V2 settings and post-processing; tensile on Die C specimens cut from printed sheets after 3+ h at 23 °C.

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 Elastic 50A is 3D printed: its properties depend on build direction and print settings; these are typical values.

Questions

Is Plastic HDPE stronger than SLA Resin Elastic 50A?

Plastic HDPE is stronger: its yield strength is 24 MPa against tensile strength 3.4 MPa for SLA Resin Elastic 50A (7.06x).

Which is lighter, Plastic HDPE or SLA Resin Elastic 50A?

Plastic HDPE is lighter: 950 kg/m³ against 1,010 kg/m³ for SLA Resin Elastic 50A.

Which is lighter for the same job, Plastic HDPE or SLA Resin Elastic 50A?

For the same stiffness or strength: Plastic HDPE is lighter for a strong rod or tie, strong beam, strong panel or plate.

Part that must bePlastic HDPESLA Resin Elastic 50A
Strong rod or tielighter7.5x heavier
Strong beamlighter3.91x heavier
Strong panel or platelighter2.82x 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).

Among 59 materials

1k10k0.1110100Density (kg/m³)Young's modulus (GPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonAluminumSteelIronTitaniumSteel AISI 1018Stainless 304Stainless 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless 303Stainless 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelPlastic HDPE
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless 304Stainless 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless 303Stainless 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickPlastic HDPESLA Resin Elastic 50A
Strength against density

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