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Plastic POM/Acetal vs. Titanium Ti-6Al-4V

Compare Plastic POM/Acetal vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Plastic POM/AcetalBulk polymer (molded or machined)
Titanium Ti-6Al-4VWrought
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Mechanical
Yield strength69MPasourcetypical (single ASTM D638 tensile strength)885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength69MPasourcetypical940MPasourcetypical, plate, annealed
Compressive strength124MPasourcecompressive stress at 10% deformationnot sourced
Flexural strength99MPasourceflexural yield strength, typicalnot sourced
Elongation at break75%sourcetypical16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)2.8GPasourcetypical107–122GPasourcetypical range, 20 °C
Density1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')4,430kg/m³sourcenominal
Strength to weight48.6kN·m/kg200kN·m/kg4.11x higher
Stiffness to weight1.97MN·m/kg25.8MN·m/kg13.1x higher
Poisson's ratio0.35sourcetypical0.342sourcemean of TIMET measurements
Shear modulus1.04GPa42.7GPa41.1x stiffer in shear
Bulk modulus3.11GPa121GPa
Speed of sound1,404m/s5,084m/s
Thermal
Thermal conductivity0.4W/m·Ksourcetypical6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion122µm/m·Ksourcemean, 29 to 60 °C9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing610µm growth45µm growth13.6x less
Specific heat1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific)580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)0.192mm²/s2.57mm²/s13.4x faster
Thermal shock resistance52.5W/m3,730W/m71x more resistant
Melting point175°Csourcecrystalline melting point1,630–1,650°Csourcemelting range
Max service temperature125°CsourceHDT 1.8 MPa (annealed)400°Csourceupper recommended use temperature
Values forDuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.comTIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties

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 Plastic POM/Acetal stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against 69 MPa for Plastic POM/Acetal (12.8x).

Which is lighter, Plastic POM/Acetal or Titanium Ti-6Al-4V?

Plastic POM/Acetal is lighter: 1,420 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

Which is stiffer, Plastic POM/Acetal or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Plastic POM/Acetal or Titanium Ti-6Al-4V?

For the same stiffness or strength: Titanium Ti-6Al-4V 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 bePlastic POM/AcetalTitanium Ti-6Al-4V
Stiff rod or tie (tension)13.1x heavierlighter
Stiff beam (bending)2.05x heavierlighter
Stiff panel or plate10% heavierlighter
Strong rod or tie4.11x heavierlighter
Strong beam1.76x heavierlighter
Strong panel or plate15% heavierlighter

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, Plastic POM/Acetal or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V conducts heat better: 6.6 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.

Which expands less with temperature?

Titanium Ti-6Al-4V expands less: 9 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-T7451Brass 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 SteelPlastic POM/AcetalTitanium Ti-6Al-4V
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-T7451Brass 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 SteelBrickPlastic POM/AcetalTitanium Ti-6Al-4V
Strength against density

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