Materials / Compare
Aluminum ADC12 vs. Plastic POM/Acetal
Compare Aluminum ADC12 vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 149MPasourceone test result, 0.2% proof stress, as cast, ASTM tensile bar (Daiki) | 69MPasourcetypical (single ASTM D638 tensile strength) |
| Ultimate tensile strength | 345MPasourceone test result, as cast, ASTM tensile bar (Daiki) | 69MPasourcetypical |
| Compressive strength | not sourced | 124MPasourcecompressive stress at 10% deformation |
| Flexural strength | not sourced | 99MPasourceflexural yield strength, typical |
| Elongation at break | 2.3%sourceone test result, as cast, ASTM tensile bar (Daiki) | 75%sourcetypical |
| Young's modulus (stiffness) | 79.8GPasourcestandard value (S.S.Aluminum) | 2.8GPasourcetypical |
| Density | 2,680kg/m³sourcemeasured (Daiki) | 1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties') |
| Strength to weight | 55.6kN·m/kg14% higher | 48.6kN·m/kg |
| Stiffness to weight | 29.8MN·m/kg15.1x higher | 1.97MN·m/kg |
| Poisson's ratio | not sourced | 0.35sourcetypical |
| Shear modulus | not sourced | 1.04GPa |
| Bulk modulus | not sourced | 3.11GPa |
| Speed of sound | 5,457m/s | 1,404m/s |
| Thermal | ||
| Thermal conductivity | 125W/m·Ksourcemeasured on specimens cut from a 50 x 100 x 5 mm flat die casting (Daiki) | 0.4W/m·Ksourcetypical |
| Thermal expansion | 21µm/m·Ksourcemeasured, temperature range not stated (Daiki) | 122µm/m·Ksourcemean, 29 to 60 °C |
| 100 mm part over a 50 °C swing | 105µm growth5.81x less | 610µm growth |
| Specific heat | 911J/kg·Ksourcemeasured (Daiki) | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) |
| Heats up and cools (diffusivity) | 51.2mm²/s266x faster | 0.192mm²/s |
| Thermal shock resistance | not sourced | 52.5W/m |
| Melting point | 515–582°Csourcesolidus-liquidus (Daiki) | 175°Csourcecrystalline melting point |
| Max service temperature | not sourced | 125°CsourceHDT 1.8 MPa (annealed) |
| Values for | JIS ADC12 (Al-Si-Cu, about A383 / EN AC-46100) high-pressure die-casting alloy, as cast; physical properties from Daiki Aluminium Industry (ADC12 ingot producer) measured values; modulus from S.S.Aluminum (ADC12 ingot producer) standard values. | 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 Aluminum ADC12 stronger than Plastic POM/Acetal?
Aluminum ADC12 is stronger: its yield strength is 149 MPa against 69 MPa for Plastic POM/Acetal (2.16x).
Which is lighter, Aluminum ADC12 or Plastic POM/Acetal?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 2,680 kg/m³ for Aluminum ADC12.
Which is stiffer, Aluminum ADC12 or Plastic POM/Acetal?
Aluminum ADC12 is stiffer: Young's modulus 79.8 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Aluminum ADC12 deflects less under the same load.
Which is lighter for the same job, Aluminum ADC12 or Plastic POM/Acetal?
For the same stiffness or strength: Aluminum ADC12 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie; Plastic POM/Acetal is lighter for a strong beam, strong panel or plate.
| Part that must be | Aluminum ADC12 | Plastic POM/Acetal |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 15.1x heavier |
| Stiff beam (bending) | lighter | 2.83x heavier |
| Stiff panel or plate | lighter | 1.62x heavier |
| Strong rod or tie | lighter | 14% heavier |
| Strong beam | 13% heavier | lighter |
| Strong panel or plate | 28% heavier | lighter |
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 ADC12 or Plastic POM/Acetal?
Aluminum ADC12 conducts heat better: 125 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Aluminum ADC12 expands less: 21 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.