Materials / Compare
Ceramic Alumina 96% vs. Plastic PTFE
Compare Ceramic Alumina 96% vs. Plastic PTFE 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) | 9MPasourcetypical yield strength at 23 °C (Teflon PTFE, Table 8) |
| Ultimate tensile strength | 221MPasourcetypical tensile strength, 25 °C (ACMA Test #4) | 39.3MPasourcetypical, skived tape 0.13 mm |
| Compressive strength | 2,068MPasourcetypical, 20 °C (ASTM-C773) | not sourced |
| Flexural strength | 358MPasourceflexural strength (MOR), 20 °C (ASTM-F417) | not sourced |
| Elongation at break | not sourced | 350%sourcetypical, skived tape 0.13 mm |
| Young's modulus (stiffness) | 303GPasourcetypical, 20 °C (ASTM-C848) | not sourced |
| Density | 3,720kg/m³sourcetypical (ASTM-C20) | 2,160kg/m³sourcetypical (standard specific gravity, ASTM D4894) |
| Strength to weight | 59.4kN·m/kg14.3x higher | 4.17kN·m/kg |
| Stiffness to weight | 81.5MN·m/kg | not sourced |
| Poisson's ratio | 0.21sourcetypical, 20 °C (ASTM-C848) | 0.46sourcetypical, 23 °C (Teflon PTFE resins, Chemours handbook) |
| Shear modulus | 125GPa | not sourced |
| Bulk modulus | 174GPa | not sourced |
| Speed of sound | 9,025m/s | not sourced |
| Thermal | ||
| Thermal conductivity | 24.7W/m·Ksourcetypical, 20 °C (ASTM-C408) | 0.25W/m·Ksourcetypical, granular resin, 4.6 mm specimen |
| Thermal expansion | 8.2µm/m·Ksourcemean, 25-1000 °C (ASTM-C372) | 100µm/m·Ksourcetypical, granular resin, 23-60 °C (ASTM E228) |
| 100 mm part over a 50 °C swing | 41µm growth12.2x less | 500µm growth |
| Specific heat | 880J/kg·Ksourcetypical, 100 °C (ASTM-E1269) | 1,400J/kg·Ksourcetypical, granular resin, 20 °C (ASTM D4591) |
| Heats up and cools (diffusivity) | 7.55mm²/s91.3x faster | 0.0827mm²/s |
| Thermal shock resistance | 1,736W/m | not sourced |
| Melting point | not sourced | 327°Csourcesecond melting peak (sintered polymer), +/-10 |
| Max service temperature | not sourced | 260°Csourceservice temperature (Chemours general Teflon PTFE statement) |
| 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. | Chemours Teflon PTFE 7C X granular molding resin, typical values (tensile/elongation measured on 0.13 mm skived tape) |
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 PTFE?
Ceramic Alumina 96% is stronger: its tensile strength is 221 MPa against yield strength 9 MPa for Plastic PTFE (24.6x).
Which is lighter, Ceramic Alumina 96% or Plastic PTFE?
Plastic PTFE is lighter: 2,160 kg/m³ against 3,720 kg/m³ for Ceramic Alumina 96%.
Which is lighter for the same job, Ceramic Alumina 96% or Plastic PTFE?
For the same stiffness or strength: Ceramic Alumina 96% is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Ceramic Alumina 96% | Plastic PTFE |
|---|---|---|
| Strong rod or tie | lighter | 14.3x heavier |
| Strong beam | lighter | 4.91x heavier |
| Strong panel or plate | lighter | 2.88x 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, Ceramic Alumina 96% or Plastic PTFE?
Ceramic Alumina 96% conducts heat better: 24.7 W/m·K against 0.25 W/m·K for Plastic PTFE.
Which expands less with temperature?
Ceramic Alumina 96% expands less: 8.2 µm/m·K against 100 µm/m·K for Plastic PTFE.