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Aluminum 7050-T7451 vs. Plastic POM/Acetal

Compare Aluminum 7050-T7451 vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.

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Aluminum 7050-T7451Wrought
Plastic POM/AcetalBulk polymer (molded or machined)
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Mechanical
Yield strength469MPasourcetypical, longitudinal, 0.2% offset69MPasourcetypical (single ASTM D638 tensile strength)
Ultimate tensile strength524MPasourcetypical, longitudinal69MPasourcetypical
Compressive strengthnot sourced124MPasourcecompressive stress at 10% deformation
Flexural strengthnot sourced99MPasourceflexural yield strength, typical
Elongation at break11%sourcetypical, longitudinal75%sourcetypical
Young's modulus (stiffness)70.3GPasourcetypical25.1x stiffer2.8GPasourcetypical
Density2,830kg/m³sourcenominal1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')
Strength to weight166kN·m/kg3.41x higher48.6kN·m/kg
Stiffness to weight24.8MN·m/kg12.6x higher1.97MN·m/kg
Poisson's ratio0.33sourcetypical (handbook physical constant)0.35sourcetypical
Shear modulus26.4GPa25.5x stiffer in shear1.04GPa
Bulk modulus68.9GPa3.11GPa
Speed of sound4,984m/s1,404m/s
Thermal
Thermal conductivity157W/m·Ksourcetypical, 20 °C0.4W/m·Ksourcetypical
Thermal expansion23.5µm/m·Ksourcetypical, mean 20-100 °C122µm/m·Ksourcemean, 29 to 60 °C
100 mm part over a 50 °C swing118µm growth5.19x less610µm growth
Specific heat860J/kg·Ksourcetypical, at 100 °C1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific)
Heats up and cools (diffusivity)64.5mm²/s335x faster0.192mm²/s
Thermal shock resistance29,862W/m569x more resistant52.5W/m
Melting point524–635°Csourcemelting range175°Csourcecrystalline melting point
Max service temperaturenot sourced125°CsourceHDT 1.8 MPa (annealed)
Values for7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5JDuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com

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.

Questions

Is Aluminum 7050-T7451 stronger than Plastic POM/Acetal?

Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 69 MPa for Plastic POM/Acetal (6.8x).

Which is lighter, Aluminum 7050-T7451 or Plastic POM/Acetal?

Plastic POM/Acetal is lighter: 1,420 kg/m³ against 2,830 kg/m³ for Aluminum 7050-T7451.

Which is stiffer, Aluminum 7050-T7451 or Plastic POM/Acetal?

Aluminum 7050-T7451 is stiffer: Young's modulus 70.3 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Aluminum 7050-T7451 deflects less under the same load.

Which is lighter for the same job, Aluminum 7050-T7451 or Plastic POM/Acetal?

For the same stiffness or strength: Aluminum 7050-T7451 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 beAluminum 7050-T7451Plastic POM/Acetal
Stiff rod or tie (tension)lighter12.6x heavier
Stiff beam (bending)lighter2.51x heavier
Stiff panel or platelighter47% heavier
Strong rod or tielighter3.41x heavier
Strong beamlighter1.8x heavier
Strong panel or platelighter31% 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 conducts heat better, Aluminum 7050-T7451 or Plastic POM/Acetal?

Aluminum 7050-T7451 conducts heat better: 157 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.

Which expands less with temperature?

Aluminum 7050-T7451 expands less: 23.5 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.

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-H32Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic HDPEPlastic 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 SteelAluminum 7050-T7451Plastic POM/Acetal
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-H32Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickAluminum 7050-T7451Plastic POM/Acetal
Strength against density

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