PFA INJ (Injection-molding grade)
Grade
ASTM D3307 · ISO 12086 · also Hyflon PFA, Perfluoroalkoxy
Pick for thin-wall or complex injection-molded fittings and valve bodies where flow length matters more than ultimate toughness.
Values for the INJ condition
Other PFA grades and fills
PFA is listed in 6 conditions; see the grade overview at PFA.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
INJThis page Injection-molding grade | Pick for thin-wall or complex injection-molded fittings and valve bodies where flow length matters more than ultimate toughness. | 12 | 26 | 300 | 59 Shore D |
General purpose unfilled/natural resin | Standard industrial PFA for chemical-plant linings, hose, gaskets and general moldings where semiconductor purity is not required. | 13 | 28 | 300 | 60 Shore D |
High Purity (Semiconductor)Default HP/HP Plus grade, ultra-low extractable metals | Choose for wafer-fab wet-chemical tubing, fittings, valve liners, bottles and quartz-substitute vessels where ppb-level metal and ion extractables matter. | 14 | 30 | 330 | 60 Shore D |
Rotolining / powder coating grade | Micronised or pelletised very-high-MW resin for pinhole-free rotolined vessels, pipe spools and pump/valve linings. | 14 | 30 | 350 | 60 Shore D |
Antistatic / conductive carbon-filled PFA | Carbon-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. | 16 | 21 | 150 | 63 Shore D |
20% glass-fibre reinforced PFA compound | Compounded PFA for wear parts, seats and bushings needing higher stiffness, lower creep and reduced thermal expansion; loses transparency and some chemical purity. | 20 | 24 | 25 | 65 Shore D |
What is PFA INJ?
PFA INJ is PFA in the INJ grade — pick for thin-wall or complex injection-molded fittings and valve bodies where flow length matters more than ultimate toughness. PFA INJ has a yield strength of 12 MPa (1.74 ksi) and a tensile strength of 26 MPa (3.77 ksi) — weaker than 88% of polymer grades. Elongation at break is 300% and the elastic modulus is 0.6 GPa (0.087 Msi). PFA INJ has a density of 2.15 g/cm³ (0.0777 lb/in³), heavier than 99% of polymer grades. Its glass-transition temperature is 90°C (194 °F). High Purity (Semiconductor) is the default condition FabDigit quotes; INJ is available on request or by drawing note.
Advantages
- Good corrosion resistance — 99/100, better than 100% of polymer grades
- Good UV / weathering resistance — 99/100, better than 100% of polymer grades
- High service temperature — 255°C (491 °F), better than 95% of polymer grades
- Low moisture uptake — 0.02%, better than 92% of polymer grades
- Ductile — tolerates forming and impact — 300%, better than 81% of polymer grades
Limitations
- Heavy — 2.15 g/cm³ (0.0777 lb/in³), worse than 99% of polymer grades
- High mold shrinkage — 4%, worse than 99% of polymer grades
- High embodied carbon — 12 kg CO₂/kg, worse than 91% of polymer grades
- Low strength — 12 MPa (1.74 ksi), worse than 88% of polymer grades
PFA INJ properties
Typical room-temperature values for PFA INJ; 26 are specific to this condition. Other listed values are PFA reference data and may not represent this condition. Bars are the position among polymer grades.
Physical7
PFA INJ has a density of 2.15 g/cm³ (0.0777 lb/in³), heavier than 99% of polymer grades. Its glass-transition temperature is 90°C (194 °F).
Mechanical13
PFA INJ has a yield strength of 12 MPa (1.74 ksi) and a tensile strength of 26 MPa (3.77 ksi) — weaker than 88% of polymer grades. Elongation at break is 300% and the elastic modulus is 0.6 GPa (0.087 Msi).
Thermal11
PFA INJ is rated for continuous service to 255°C (491 °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 130 µm/m·K (72.2 µin/in·°F).
Electrical7
PFA INJ 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 (99/100), better than 100% of polymer grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of PFA INJ takes about 250 MJ of energy and emits 12 kg of CO₂ — more than 92% of polymer grades. Typical recycled content is 0%.
Manufacturability8
PFA INJ's machinability is good (55/100, worse than 64% of polymer grades); weldability very good (72/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PFA INJ
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 INJ — frequently asked
What is PFA INJ used for?
PFA INJ 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 INJ?
PFA INJ has a typical yield strength of 12 MPa (1.74 ksi) and a tensile strength of 26 MPa (3.77 ksi) — weaker than 88% of polymer grades. Strength varies by condition: see the 6 listed tempers.
Is PFA INJ easy to machine?
Reasonably — machinability is rated good (55/100, worse than 64% 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 INJ be welded?
Yes — weldability is rated very good (72/100). 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 INJ?
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 INJ 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 INJ?
PFA INJ is rated for continuous use to about 255°C (491 °F), and briefly to 285°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PFA High Purity (Semiconductor) and PFA GF20?
High Purity (Semiconductor) is the default condition — choose for wafer-fab wet-chemical tubing, fittings, valve liners, bottles and quartz-substitute vessels where ppb-level metal and ion extractables matter. GF20: compounded PFA for wear parts, seats and bushings needing higher stiffness, lower creep and reduced thermal expansion; loses transparency and some chemical purity. Yield strength is 14 MPa in High Purity (Semiconductor) versus 20 MPa in GF20.
Can FabDigit make parts in PFA INJ?
Yes — PFA INJ is available for CNC machining, sheet metal and injection molding; every part is priced by an engineer rather than instantly. 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.