TFM-PTFE CF20 vs TFM-PTFE GF25
Polymer · TFM-PTFE grade comparison
TFM-PTFE CF20 and TFM-PTFE GF25 are two grades of the same polymer grade, TFM-PTFE: CF20 (20 % carbon fibre filled modified PTFE) versus GF25 (25 % glass fibre filled modified PTFE). The chemistry is identical, so every difference below comes from the condition. TFM-PTFE GF25 is the more ductile: elongation 250% versus 120% for TFM-PTFE CF20. TFM-PTFE CF20 is lighter (2.05 g/cm³ vs 2.23 g/cm³ for TFM-PTFE GF25) and TFM-PTFE CF20 is stiffer (1.4 GPa vs 1.1 GPa). On the shop floor, TFM-PTFE GF25 welds better (good vs not recommended).
TFM-PTFE CF20Choose it when weight is the constraint.
TFM-PTFE GF25Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
TFM-PTFE CF20 vs TFM-PTFE GF25: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Elongation at Break
Compressive Strength
Flexural Modulus
Shear Strength
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell R
Same in both: Poisson's Ratio 0.46 · Tensile Strength (Ultimate) 17 MPa2.5 ksi · Compressive Modulus 0.7 GPa0.1 Msi
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 327°C621 °F · Glass Transition (Tg) 126°C259 °F · Water Absorption (24 h) 0.01% · Water Absorption (Saturation) 0.01% · Refractive Index 1.35
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Same in both: Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°F · Max Service Temperature (continuous) 260°C500 °F · Min Service Temperature -200°C-328 °F · Limiting Oxygen Index 95% · Max Service Temperature (short-term) 300°C572 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Dielectric Strength 45 kV/mm1,143 V/mil · Dielectric Constant (1 MHz) 2.1 · Dissipation Factor (1 MHz) 2×10⁻⁴ · Volume Resistivity 1×10¹⁸ Ω·cm · Surface Resistivity 1×10¹⁷ Ω · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 96 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Mold Shrinkage
Same in both: Polishability 30 / 100 · Processing Melt Temperature (typ.) 370°C698 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 220 MJ/kg94,583 BTU/lb · Embodied Carbon (primary production) 11 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 0%
Strength versus weight
Yield strength against density for every polymer grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
TFM-PTFE CF20 vs TFM-PTFE GF25 — frequently asked
What is the difference between TFM-PTFE CF20 and TFM-PTFE GF25?
TFM-PTFE CF20 and TFM-PTFE GF25 are two grades of the same polymer grade, TFM-PTFE: CF20 (20 % carbon fibre filled modified PTFE) versus GF25 (25 % glass fibre filled modified PTFE). The chemistry is identical, so every difference below comes from the condition. TFM-PTFE GF25 is the more ductile: elongation 250% versus 120% for TFM-PTFE CF20.
Which grade does FabDigit quote by default, CF20 or GF25?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which welds better, TFM-PTFE CF20 or TFM-PTFE GF25?
TFM-PTFE GF25. Its weldability rates good (55/100) against not recommended (5/100) for TFM-PTFE CF20.
Ready to make it?
Upload a CAD file and FabDigit prices the part in TFM-PTFE CF20 and TFM-PTFE GF25 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.