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Plastic ABS (bulk/injection) vs. Plastic POM/Acetal

Compare Plastic ABS (bulk/injection) vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.

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Plastic ABS (bulk/injection)Bulk polymer (molded or machined)
Plastic POM/AcetalBulk polymer (molded or machined)
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Mechanical
Yield strength45MPasourcetypical, tensile stress at yield 23 °C69MPasourcetypical (single ASTM D638 tensile strength)
Ultimate tensile strengthnot sourced69MPasourcetypical
Compressive strengthnot sourced124MPasourcecompressive stress at 10% deformation
Flexural strength65MPasourcetypical, 23 °C99MPasourceflexural yield strength, typical
Elongation at break10%sourcenominal strain at break, 23 °C75%sourcetypical
Young's modulus (stiffness)2.3GPasourcetypical2.8GPasourcetypical22% stiffer
Density1,040kg/m³sourcetypical1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')
Strength to weight43.3kN·m/kg48.6kN·m/kg12% higher
Stiffness to weight2.21MN·m/kg12% higher1.97MN·m/kg
Poisson's ratio0.39sourcetypical, ABS family (Covestro Part and Mold Design guide, Table 3-1)0.35sourcetypical
Shear modulus0.827GPa1.04GPa25% stiffer in shear
Bulk modulus3.48GPa3.11GPa
Speed of sound1,487m/s1,404m/s
Thermal
Thermal conductivity0.17W/m·Ksourcetypical0.4W/m·Ksourcetypical2.35x more heat through a fin
Thermal expansion80–110µm/m·Ksourcerange122µm/m·Ksourcemean, 29 to 60 °C
100 mm part over a 50 °C swing475µm growth28% less610µm growth
Specific heatnot sourced1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific)
Heats up and cools (diffusivity)not sourced0.192mm²/s
Thermal shock resistance21.4W/m52.5W/m2.46x more resistant
Melting pointnot sourced175°Csourcecrystalline melting point
Max service temperature94°CsourceHDT 1.8 MPa (annealed 4 h/80 °C)125°CsourceHDT 1.8 MPa (annealed)
Values forINEOS Styrolution Terluran GP-22 general-purpose injection-molding ABS, ISO typical values (TDS revision 08/01/2022)DuPont 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 Plastic ABS (bulk/injection) stronger than Plastic POM/Acetal?

Plastic POM/Acetal is stronger: its yield strength is 69 MPa against 45 MPa for Plastic ABS (bulk/injection) (1.53x).

Which is lighter, Plastic ABS (bulk/injection) or Plastic POM/Acetal?

Plastic ABS (bulk/injection) is lighter: 1,040 kg/m³ against 1,420 kg/m³ for Plastic POM/Acetal.

Which is stiffer, Plastic ABS (bulk/injection) or Plastic POM/Acetal?

Plastic POM/Acetal is stiffer: Young's modulus 2.8 GPa against 2.3 GPa for Plastic ABS (bulk/injection), so the same part in Plastic POM/Acetal deflects less under the same load.

Which is lighter for the same job, Plastic ABS (bulk/injection) or Plastic POM/Acetal?

For the same stiffness or strength: Plastic ABS (bulk/injection) is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong beam, strong panel or plate; Plastic POM/Acetal is lighter for a strong rod or tie.

Part that must bePlastic ABS (bulk/injection)Plastic POM/Acetal
Stiff rod or tie (tension)lighter12% heavier
Stiff beam (bending)lighter24% heavier
Stiff panel or platelighter28% heavier
Strong rod or tie12% heavierlighter
Strong beamlighter3% heavier
Strong panel or platelighter10% 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, Plastic ABS (bulk/injection) or Plastic POM/Acetal?

Plastic POM/Acetal conducts heat better: 0.4 W/m·K against 0.17 W/m·K for Plastic ABS (bulk/injection).

Which expands less with temperature?

Plastic ABS (bulk/injection) expands less: 95 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 718Magnesium AZ31B-H24Zinc Zamak 3Plastic 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 ABS (bulk/injection)Plastic 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 718Magnesium AZ31B-H24Zinc Zamak 3Plastic 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 ABS (bulk/injection)Plastic POM/Acetal
Strength against density

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