Materials / Compare
Plastic Nylon PA66 vs. Plastic PTFE
Compare Plastic Nylon PA66 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 | 85MPasourcetypical, dry | 9MPasourcetypical yield strength at 23 °C (Teflon PTFE, Table 8) |
| Ultimate tensile strength | not sourced | 39.3MPasourcetypical, skived tape 0.13 mm |
| Elongation at break | 30%sourcenominal strain at break, dry | 350%sourcetypical, skived tape 0.13 mm |
| Young's modulus (stiffness) | 3GPasourcetypical, dry | not sourced |
| Density | 1,130kg/m³sourcetypical | 2,160kg/m³sourcetypical (standard specific gravity, ASTM D4894) |
| Strength to weight | 75.2kN·m/kg18.1x higher | 4.17kN·m/kg |
| Stiffness to weight | 2.65MN·m/kg | not sourced |
| Poisson's ratio | 0.4sourcebase material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1) | 0.46sourcetypical, 23 °C (Teflon PTFE resins, Chemours handbook) |
| Shear modulus | 1.07GPa | not sourced |
| Bulk modulus | 5GPa | not sourced |
| Speed of sound | 1,629m/s | not sourced |
| Thermal | ||
| Thermal conductivity | 0.33W/m·Ksourcetypical | 0.25W/m·Ksourcetypical, granular resin, 4.6 mm specimen |
| Thermal expansion | 98µm/m·Ksourcelongitudinal, 23-55 °C | 100µm/m·Ksourcetypical, granular resin, 23-60 °C (ASTM E228) |
| 100 mm part over a 50 °C swing | 490µm growth2% less | 500µm growth |
| Specific heat | 1,700J/kg·Ksourcetypical | 1,400J/kg·Ksourcetypical, granular resin, 20 °C (ASTM D4591) |
| Heats up and cools (diffusivity) | 0.172mm²/s2.08x faster | 0.0827mm²/s |
| Thermal shock resistance | 57.2W/m | not sourced |
| Melting point | 260°CsourceDSC | 327°Csourcesecond melting peak (sintered polymer), +/-10 |
| Max service temperature | 101°CsourceIEC 60216 temperature index, 20000 h | 260°Csourceservice temperature (Chemours general Teflon PTFE statement) |
| Values for | BASF Ultramid A3K (PA66, unreinforced injection-moulding grade), Product Information 02/2026, dry values (ISO methods) | 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 Nylon PA66 stronger than Plastic PTFE?
Plastic Nylon PA66 is stronger: its yield strength is 85 MPa against 9 MPa for Plastic PTFE (9.44x).
Which is lighter, Plastic Nylon PA66 or Plastic PTFE?
Plastic Nylon PA66 is lighter: 1,130 kg/m³ against 2,160 kg/m³ for Plastic PTFE.
Which is lighter for the same job, Plastic Nylon PA66 or Plastic PTFE?
For the same stiffness or strength: Plastic Nylon PA66 is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Plastic Nylon PA66 | Plastic PTFE |
|---|---|---|
| Strong rod or tie | lighter | 18.1x heavier |
| Strong beam | lighter | 8.54x heavier |
| Strong panel or plate | lighter | 5.87x 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 Nylon PA66 or Plastic PTFE?
Plastic Nylon PA66 conducts heat better: 0.33 W/m·K against 0.25 W/m·K for Plastic PTFE.
Which expands less with temperature?
Plastic Nylon PA66 expands less: 98 µm/m·K against 100 µm/m·K for Plastic PTFE.