PFA · reinforced grade
PFA-GF20
Properties of the GF20 condition, compared with the other PFA grades.
Compounded PFA for wear parts, seats and bushings needing higher stiffness, lower creep and reduced thermal expansion; loses transparency and some chemical purity.
What is PFA-GF20?
PFA-GF20 is PFA in the GF20 grade — compounded PFA for wear parts, seats and bushings needing higher stiffness, lower creep and reduced thermal expansion; loses transparency and some chemical purity. PFA-GF20 has a yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 91% of polymer grades. Elongation at break is 25% and the elastic modulus is 1.5 GPa (0.218 Msi). PFA-GF20 has a density of 2.25 g/cm³ (0.0813 lb/in³), heavier than 100% of polymer grades. Its glass-transition temperature is 90°C (194 °F). High Purity (Semiconductor) is the default condition FabDigit quotes; GF20 is available on request or by drawing note.
Advantages
- Good UV / weathering resistance — 99/100, better than 100% of polymer grades
- High service temperature — 260°C (500 °F), better than 97% of polymer grades
- Low moisture uptake — 0.02%, better than 92% of polymer grades
- Good corrosion resistance — 90/100, better than 81% of polymer grades
- Readily welded — 75/100, better than 80% of polymer grades
Limitations
- Heavy — 2.25 g/cm³ (0.0813 lb/in³), worse than 100% of polymer grades
- High mold shrinkage — 4%, worse than 99% of polymer grades
- Low strength — 13 MPa (1.89 ksi), worse than 91% of polymer grades
- High embodied carbon — 12 kg CO₂/kg, worse than 91% of polymer grades
- Difficult to machine — 45/100, worse than 77% of polymer grades
PFA-GF20 properties
Typical room-temperature values for PFA-GF20 — 9 properties are specific to this condition; the rest are grade-level values shared by every PFA grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical7
PFA-GF20 has a density of 2.25 g/cm³ (0.0813 lb/in³), heavier than 100% of polymer grades. Its glass-transition temperature is 90°C (194 °F).
Mechanical8
PFA-GF20 has a yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 91% of polymer grades. Elongation at break is 25% and the elastic modulus is 1.5 GPa (0.218 Msi).
Thermal10
PFA-GF20 is rated for continuous service to 260°C (500 °F). It conducts heat at 0.22 W/m·K (0.127 BTU/hr·ft·°F), better than 60% of polymer grades. Thermal expansion is 70 µm/m·K (38.9 µin/in·°F).
Electrical7
PFA-GF20 is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 1×10¹⁶ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 81% of polymer grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of PFA-GF20 takes about 250 MJ of energy and emits 12 kg of CO₂ — more than 93% of polymer grades. Typical recycled content is 0%.
Manufacturability8
PFA-GF20's machinability is fair (45/100, worse than 77% of polymer grades); weldability very good (75/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other PFA grades and fills
PFA is also supplied in 7 other conditions. The full side-by-side table is on the PFA overview.
- High Purity (Semiconductor)DefaultChoose for wafer-fab wet-chemical tubing, fittings, valve liners, bottles and quartz-substitute vessels where ppb-level metal and ion extractables matter.30 MPa tensile
- GF20Compounded PFA for wear parts, seats and bushings needing higher stiffness, lower creep and reduced thermal expansion; loses transparency and some chemical purity.24 MPa tensile
- AS-CCarbon-black or carbon-fibre loaded PFA for static-dissipative chemical hose liners, fuel/solvent handling and semiconductor tools where charge build-up is a hazard.21 MPa tensile
Working with PFA-GF20
Is PFA easy to machine?
Machines like PTFE: very sharp positive-rake tools, high speed with light feed and generous coolant, allow for large springback and 4–5× steel thermal expansion; anneal near 260 °C before finish cuts on precision parts.
Can PFA be welded?
Fully fusion weldable by hot-gas, butt-fusion, IR or flare/heat-forming above 350 °C using PFA filler; keep tooling clean and use inert purge to avoid corrosive decomposition products.
Can PFA be formed, bent or molded?
Injection mould/extrude at 350–400 °C melt with corrosion-resistant (Hastelloy/Xaloy 306) screws and barrels, mould 150–220 °C, and design for 3–5% shrinkage plus generous venting; rotolining and transfer moulding use low-MFR grades.
What surface finishes work on PFA?
Cannot be painted, bonded or printed without surface treatment — use sodium-naphthalene etch, plasma or corona for adhesion; parts are naturally non-stick, low-friction and need no protective coating.
PFA chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| perfluoropropyl vinyl ether (PPVE)comonomer giving melt processability; MFA variants use PMVE instead | 0.5 – 5 | 2 |
| tetrafluoroethylene (TFE)backbone monomer | ≥ 95 (balance) | — |
PFA-GF20 — frequently asked
What is PFA-GF20 used for?
PFA-GF20 is typically used for high-purity semiconductor tubing and fittings, chemical process pipe and vessel linings, semiconductor wet-process parts, valve and pump components, wire and cable insulation and transparent film and sight tubes. In short: corrosion-proof chemical expert.
What is the yield strength of PFA-GF20?
PFA-GF20 has a typical yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 91% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is PFA-GF20 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 77% of polymer grades). Machines like PTFE: very sharp positive-rake tools, high speed with light feed and generous coolant, allow for large springback and 4–5× steel thermal expansion; anneal near 260 °C before finish cuts on precision parts.
Can PFA-GF20 be welded?
Yes — weldability is rated very good (75/100). Fully fusion weldable by hot-gas, butt-fusion, IR or flare/heat-forming above 350 °C using PFA filler; keep tooling clean and use inert purge to avoid corrosive decomposition products.
What surface finishes work on PFA-GF20?
Cannot be painted, bonded or printed without surface treatment — use sodium-naphthalene etch, plasma or corona for adhesion; parts are naturally non-stick, low-friction and need no protective coating.
Can PFA-GF20 be formed, bent or molded?
Injection mould/extrude at 350–400 °C melt with corrosion-resistant (Hastelloy/Xaloy 306) screws and barrels, mould 150–220 °C, and design for 3–5% shrinkage plus generous venting; rotolining and transfer moulding use low-MFR grades.
What is the maximum service temperature of PFA-GF20?
PFA-GF20 is rated for continuous use to about 260°C (500 °F), and briefly to 285°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in PFA-GF20?
Yes — PFA-GF20 is available for CNC machining, sheet metal and injection molding with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Teflon PFA fluoroplastic resin product and property information — Chemours (2023)
- Hyflon PFA/MFA product data sheets — Syensqo (Solvay Specialty Polymers) (2022)
- Neoflon PFA grade list and processing guide — Daikin Industries (2022)
- ASTM D3307 Standard Specification for Perfluoroalkoxy (PFA) Resin Molding and Extrusion Materials — ASTM International (2020)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- CAMPUS / UL Prospector fluoropolymer datasheets — CAMPUS Plastics / UL (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.