Materials / Compare
Ceramic Alumina 96% vs. Plastic POM/Acetal
Compare Ceramic Alumina 96% vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.
| Try it on a partA sample part to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | not given (tensile used) | 69MPasourcetypical (single ASTM D638 tensile strength) |
| Ultimate tensile strength | 221MPasourcetypical tensile strength, 25 °C (ACMA Test #4) | 69MPasourcetypical |
| Compressive strength | 2,068MPasourcetypical, 20 °C (ASTM-C773) | 124MPasourcecompressive stress at 10% deformation |
| Flexural strength | 358MPasourceflexural strength (MOR), 20 °C (ASTM-F417) | 99MPasourceflexural yield strength, typical |
| Elongation at break | not sourced | 75%sourcetypical |
| Young's modulus (stiffness) | 303GPasourcetypical, 20 °C (ASTM-C848) | 2.8GPasourcetypical |
| Density | 3,720kg/m³sourcetypical (ASTM-C20) | 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 | 59.4kN·m/kg22% higher | 48.6kN·m/kg |
| Stiffness to weight | 81.5MN·m/kg41.3x higher | 1.97MN·m/kg |
| Poisson's ratio | 0.21sourcetypical, 20 °C (ASTM-C848) | 0.35sourcetypical |
| Shear modulus | 125GPa121x stiffer in shear | 1.04GPa |
| Bulk modulus | 174GPa | 3.11GPa |
| Speed of sound | 9,025m/s | 1,404m/s |
| Thermal | ||
| Thermal conductivity | 24.7W/m·Ksourcetypical, 20 °C (ASTM-C408) | 0.4W/m·Ksourcetypical |
| Thermal expansion | 8.2µm/m·Ksourcemean, 25-1000 °C (ASTM-C372) | 122µm/m·Ksourcemean, 29 to 60 °C |
| 100 mm part over a 50 °C swing | 41µm growth14.9x less | 610µm growth |
| Specific heat | 880J/kg·Ksourcetypical, 100 °C (ASTM-E1269) | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) |
| Heats up and cools (diffusivity) | 7.55mm²/s39.2x faster | 0.192mm²/s |
| Thermal shock resistance | 1,736W/m33x more resistant | 52.5W/m |
| Melting point | not sourced | 175°Csourcecrystalline melting point |
| Max service temperature | not sourced | 125°CsourceHDT 1.8 MPa (annealed) |
| Values for | CoorsTek AD-96, nominal 96% Al2O3 sintered alumina, typical values; CoorsTek "Ceramic Seal Material Properties" (© 2018, 01899 F). AD-96 is the general 96% grade, not the ADS-96R substrate grade. | 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 Ceramic Alumina 96% stronger than Plastic POM/Acetal?
Ceramic Alumina 96% is stronger: its tensile strength is 221 MPa against yield strength 69 MPa for Plastic POM/Acetal (3.2x).
Which is lighter, Ceramic Alumina 96% or Plastic POM/Acetal?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 3,720 kg/m³ for Ceramic Alumina 96%.
Which is stiffer, Ceramic Alumina 96% or Plastic POM/Acetal?
Ceramic Alumina 96% is stiffer: Young's modulus 303 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Ceramic Alumina 96% deflects less under the same load.
Which is lighter for the same job, Ceramic Alumina 96% or Plastic POM/Acetal?
For the same stiffness or strength: Ceramic Alumina 96% 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 | Ceramic Alumina 96% | Plastic POM/Acetal |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 41.3x heavier |
| Stiff beam (bending) | lighter | 3.97x heavier |
| Stiff panel or plate | lighter | 1.82x heavier |
| Strong rod or tie | lighter | 22% heavier |
| Strong beam | 21% heavier | lighter |
| Strong panel or plate | 46% 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, Ceramic Alumina 96% or Plastic POM/Acetal?
Ceramic Alumina 96% conducts heat better: 24.7 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Ceramic Alumina 96% expands less: 8.2 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.
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