PFA Perfluoroalkoxy: Melt-Processable Fluoropolymer for Ultra-High-Purity Applications
Published: 2026-05-29
Perfluoroalkoxy (PFA) is a fully fluorinated melt-processable fluoropolymer that combines PTFE's near-universal chemical resistance and high-temperature capability (260°C continuous) with the critical advantage of conventional thermoplastic...
Perfluoroalkoxy (PFA) is a fully fluorinated melt-processable fluoropolymer that combines PTFE's near-universal chemical resistance and high-temperature capability (260°C continuous) with the critical advantage of conventional thermoplastic processability—it can be injection molded, extruded, and thermoformed using standard melt-processing techniques. This distinguishes it from PTFE, which cannot be melt-processed and must be compression-molded and sintered. PFA achieves melt processability through the incorporation of a perfluoroalkoxy side group (-O-CF₂-CF₂- or -O-CF(CF₃)-CF₂-) that disrupts the PTFE crystal lattice just enough to allow melt flow at 370-400°C while preserving the fully fluorinated chemistry responsible for chemical inertness.
PFA is the material of choice for semiconductor wet-process components (wafer carriers, diptubes, fittings, valve bodies for ultrapure water and aggressive chemical delivery systems) where PTFE's lack of melt processability limits design complexity and PTFE's microparticle shedding (from machining) is unacceptable. PFA can be injection molded into complex, smooth-surfaced geometries that minimize particle entrapment—a critical requirement for sub-10nm semiconductor manufacturing where sub-ppb metal contamination is the specification. PFA tubing and fittings are the standard for high-purity chemical distribution in semiconductor fabs, pharmaceutical WFI (Water For Injection) loops, and analytical laboratory fluid handling.
Technical Properties
| Density | 2.15 g/cm³ |
|---|---|
| Tensile Strength | 28 MPa |
| Melting Point | 305 °C |
| Shrinkage Rate | 3.0-5.0% |
| Flexural Modulus | 0.6 GPa |
| Hdt | N/A (Low — specify filled grades for structural use) |
| Continuous Service Temp | 260 °C |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Chemours Teflon PFA | |
| Dyneon PFA | |
| Daikin Neoflon PFA |
Frequently Asked Questions
How does PFA compare to PTFE when both are rated for 260°C continuous service?
While both PFA and PTFE share the same 260°C continuous service temperature rating, PFA offers three key advantages: (1) Melt processability—PFA can be injection molded into complex, smooth-surfaced geometries; PTFE requires compression molding and machining, which leaves microscopic surface roughness that traps particles. (2) Mechanical properties at temperature—PFA retains approximately 15% higher tensile strength at 250°C compared to PTFE due to its slightly more rigid backbone from the perfluoroalkoxy side groups. (3) Lower permeation—PFA's gas and vapor permeability is approximately 50% lower than PTFE's due to the side groups reducing free volume in the amorphous phase. The one area where PTFE still excels: cost. PTFE is approximately 50-70% the price of PFA, so for simple geometries (gaskets, seals, bushings) where machining is acceptable, PTFE remains the economic choice.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org