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Magnesium AZ31B-H24 vs. Plastic POM/Acetal

Compare Magnesium AZ31B-H24 vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.

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Magnesium AZ31B-H24Wrought
Plastic POM/AcetalBulk polymer (molded or machined)
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Mechanical
Yield strength220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress69MPasourcetypical (single ASTM D638 tensile strength)
Ultimate tensile strength290MPasourcetypical, H24, 0.5-6 mm69MPasourcetypical
Compressive strengthnot sourced124MPasourcecompressive stress at 10% deformation
Flexural strengthnot sourced99MPasourceflexural yield strength, typical
Elongation at break13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A75%sourcetypical
Young's modulus (stiffness)44.8GPasourcetypical (handbook physical constant)2.8GPasourcetypical
Density1,769kg/m³sourcenominal1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')
Strength to weight124kN·m/kg2.56x higher48.6kN·m/kg
Stiffness to weight25.3MN·m/kg12.8x higher1.97MN·m/kg
Poisson's ratio0.35sourcetypical (handbook physical constant)0.35sourcetypical
Shear modulus16.6GPa16x stiffer in shear1.04GPa
Bulk modulus49.8GPa3.11GPa
Speed of sound5,032m/s1,404m/s
Thermal
Thermal conductivity76.9W/m·Ksourcetypical (temper/temperature not stated)0.4W/m·Ksourcetypical
Thermal expansion26.8µm/m·Ksourcetypical (temperature range not stated)122µm/m·Ksourcemean, 29 to 60 °C
100 mm part over a 50 °C swing134µm growth4.55x less610µm growth
Specific heat1,040J/kg·Ksourcetypical1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific)
Heats up and cools (diffusivity)41.8mm²/s217x faster0.192mm²/s
Thermal shock resistance9,159W/m174x more resistant52.5W/m
Melting pointnot sourced175°Csourcecrystalline melting point
Max service temperature149°Csourcestated application limit125°CsourceHDT 1.8 MPa (annealed)
Values forAZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMSDuPont 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 Magnesium AZ31B-H24 stronger than Plastic POM/Acetal?

Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against 69 MPa for Plastic POM/Acetal (3.19x).

Which is lighter, Magnesium AZ31B-H24 or Plastic POM/Acetal?

Plastic POM/Acetal is lighter: 1,420 kg/m³ against 1,769 kg/m³ for Magnesium AZ31B-H24.

Which is stiffer, Magnesium AZ31B-H24 or Plastic POM/Acetal?

Magnesium AZ31B-H24 is stiffer: Young's modulus 44.8 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Magnesium AZ31B-H24 deflects less under the same load.

Which is lighter for the same job, Magnesium AZ31B-H24 or Plastic POM/Acetal?

For the same stiffness or strength: Magnesium AZ31B-H24 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 beMagnesium AZ31B-H24Plastic POM/Acetal
Stiff rod or tie (tension)lighter12.8x heavier
Stiff beam (bending)lighter3.21x heavier
Stiff panel or platelighter2.02x heavier
Strong rod or tielighter2.56x heavier
Strong beamlighter1.74x heavier
Strong panel or platelighter43% 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, Magnesium AZ31B-H24 or Plastic POM/Acetal?

Magnesium AZ31B-H24 conducts heat better: 76.9 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.

Which expands less with temperature?

Magnesium AZ31B-H24 expands less: 26.8 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-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Zinc 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 SteelMagnesium AZ31B-H24Plastic 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-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Zinc 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 SteelBrickMagnesium AZ31B-H24Plastic POM/Acetal
Strength against density

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