Materials / Compare
Plastic PBT GF30 vs. Plastic PTFE
Compare Plastic PBT GF30 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 | 140MPasourcestress at break, 23 °C | 39.3MPasourcetypical, skived tape 0.13 mm |
| Flexural strength | 210MPasourcetypical, 23 °C | not sourced |
| Elongation at break | 3%sourcestrain at break, 23 °C | 350%sourcetypical, skived tape 0.13 mm |
| Young's modulus (stiffness) | 9.8GPasourcetypical, 23 °C | not sourced |
| Density | 1,530kg/m³sourcetypical | 2,160kg/m³sourcetypical (standard specific gravity, ASTM D4894) |
| Strength to weight | 91.5kN·m/kg22x higher | 4.17kN·m/kg |
| Stiffness to weight | 6.41MN·m/kg | not sourced |
| Poisson's ratio | not sourced | 0.46sourcetypical, 23 °C (Teflon PTFE resins, Chemours handbook) |
| Shear modulus | not sourced | not sourced |
| Bulk modulus | not sourced | not sourced |
| Speed of sound | 2,531m/s | not sourced |
| Thermal | ||
| Thermal conductivity | 0.27W/m·Ksourcetypical (DIN 52612-1) | 0.25W/m·Ksourcetypical, granular resin, 4.6 mm specimen |
| Thermal expansion | 25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C | 100µm/m·Ksourcetypical, granular resin, 23-60 °C (ASTM E228) |
| 100 mm part over a 50 °C swing | 125µm growth4x less | 500µm growth |
| Specific heat | 1,050J/kg·Ksourcetypical, 23 °C | 1,400J/kg·Ksourcetypical, granular resin, 20 °C (ASTM D4591) |
| Heats up and cools (diffusivity) | 0.168mm²/s2.03x faster | 0.0827mm²/s |
| Thermal shock resistance | not sourced | not sourced |
| Melting point | 223°CsourceDSC (ISO 11357) | 327°Csourcesecond melting peak (sintered polymer), +/-10 |
| Max service temperature | 205°CsourceHDT 1.8 MPa | 260°Csourceservice temperature (Chemours general Teflon PTFE statement) |
| Values for | BASF Ultradur B 4300 G6 (PBT, 30% glass fibre), injection moulding grade; product information sheet 09/2026, typical values for uncoloured product at 23 °C. | 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 PBT GF30 stronger than Plastic PTFE?
Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 9 MPa for Plastic PTFE (15.6x).
Which is lighter, Plastic PBT GF30 or Plastic PTFE?
Plastic PBT GF30 is lighter: 1,530 kg/m³ against 2,160 kg/m³ for Plastic PTFE.
Which is lighter for the same job, Plastic PBT GF30 or Plastic PTFE?
For the same stiffness or strength: Plastic PBT GF30 is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Plastic PBT GF30 | Plastic PTFE |
|---|---|---|
| Strong rod or tie | lighter | 22x heavier |
| Strong beam | lighter | 8.8x heavier |
| Strong panel or plate | lighter | 5.57x 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 PBT GF30 or Plastic PTFE?
Plastic PBT GF30 conducts heat better: 0.27 W/m·K against 0.25 W/m·K for Plastic PTFE.
Which expands less with temperature?
Plastic PBT GF30 expands less: 25 µm/m·K against 100 µm/m·K for Plastic PTFE.