Materials / Compare
Plastic PMMA vs. Plastic PTFE
Compare Plastic PMMA vs. Plastic PTFE 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 | not given (tensile used) | 9MPasourcetypical yield strength at 23 °C (Teflon PTFE, Table 8) |
| Ultimate tensile strength | 80MPasourcetypical, 23 °C | 39.3MPasourcetypical, skived tape 0.13 mm |
| Compressive strength | 110MPasourcecompressive yield stress, typical | not sourced |
| Flexural strength | 115MPasourcetypical | not sourced |
| Elongation at break | 5.5%sourcetypical | 350%sourcetypical, skived tape 0.13 mm |
| Young's modulus (stiffness) | 3.3GPasourcetypical, short-term | not sourced |
| Density | 1,190kg/m³sourcetypical | 2,160kg/m³sourcetypical (standard specific gravity, ASTM D4894) |
| Strength to weight | 67.2kN·m/kg16.1x higher | 4.17kN·m/kg |
| Stiffness to weight | 2.77MN·m/kg | not sourced |
| Poisson's ratio | 0.37sourcetypical | 0.46sourcetypical, 23 °C (Teflon PTFE resins, Chemours handbook) |
| Shear modulus | 1.2GPa | not sourced |
| Bulk modulus | 4.23GPa | not sourced |
| Speed of sound | 1,665m/s | not sourced |
| Thermal | ||
| Thermal conductivity | 0.19W/m·Ksourcetypical | 0.25W/m·Ksourcetypical, granular resin, 4.6 mm specimen |
| Thermal expansion | 70µm/m·Ksource0-50 °C | 100µm/m·Ksourcetypical, granular resin, 23-60 °C (ASTM E228) |
| 100 mm part over a 50 °C swing | 350µm growth43% less | 500µm growth |
| Specific heat | 1,470J/kg·Ksourcetypical | 1,400J/kg·Ksourcetypical, granular resin, 20 °C (ASTM D4591) |
| Heats up and cools (diffusivity) | 0.109mm²/s31% faster | 0.0827mm²/s |
| Thermal shock resistance | 41.5W/m | not sourced |
| Melting point | not sourced | 327°Csourcesecond melting peak (sintered polymer), +/-10 |
| Max service temperature | 80°Csourcemax. permanent service temperature | 260°Csourceservice temperature (Chemours general Teflon PTFE statement) |
| Values for | Röhm PLEXIGLAS GS 0F00 cast acrylic sheet, typical values at 23 °C / 50 % RH (Röhm Technical Information Ref. No. 211-1) | 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 Plastic PMMA stronger than Plastic PTFE?
Plastic PMMA is stronger: its tensile strength is 80 MPa against yield strength 9 MPa for Plastic PTFE (8.89x).
Which is lighter, Plastic PMMA or Plastic PTFE?
Plastic PMMA is lighter: 1,190 kg/m³ against 2,160 kg/m³ for Plastic PTFE.
Which is lighter for the same job, Plastic PMMA or Plastic PTFE?
For the same stiffness or strength: Plastic PMMA is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Plastic PMMA | Plastic PTFE |
|---|---|---|
| Strong rod or tie | lighter | 16.1x heavier |
| Strong beam | lighter | 7.79x heavier |
| Strong panel or plate | lighter | 5.41x 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 PMMA or Plastic PTFE?
Plastic PTFE conducts heat better: 0.25 W/m·K against 0.19 W/m·K for Plastic PMMA.
Which expands less with temperature?
Plastic PMMA expands less: 70 µm/m·K against 100 µm/m·K for Plastic PTFE.