FEP Dispersion
Grade
ASTM D3368 · ISO 21138 · also Fluorinated Ethylene Propylene, Teflon FEP
Chosen for non-stick and anti-corrosion coatings on metal (tanks, rolls, cookware, glass-cloth impregnation) rather than for structural parts.
Values for the Dispersion condition
Other FEP grades and fills
FEP is listed in 4 conditions; see the grade overview at FEP.
- IM-HighMFI
- Dispersion
- Ext-LowMFI
- GF20
Compare all 4 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Injection-moulding grade, high MFI (e.g. FEP 4100-type) | Use for thin-wall or complex injection-moulded fittings, valve parts and connectors needing easy cavity fill. | 12 | 20 | 290 | 55 Shore D |
DispersionThis page Aqueous dispersion / coating powder grade | Chosen for non-stick and anti-corrosion coatings on metal (tanks, rolls, cookware, glass-cloth impregnation) rather than for structural parts. | 12 | 20 | 250 | 54 Shore D |
Extrusion grade, low MFI / high molecular weight (e.g. FEP 140-type) | Pick for thick-wall tube, rod, liners and heavy cable jackets where stress-crack resistance and melt strength matter more than cycle time. | 14 | 25 | 340 | 57 Shore D |
20 % glass-fibre reinforced FEP compound | Use where FEP's chemical resistance is needed but creep, stiffness and dimensional stability of the unfilled resin are inadequate. | — | 24 | 15 | 63 Shore D |
What is FEP Dispersion?
FEP Dispersion is FEP in the Dispersion grade — chosen for non-stick and anti-corrosion coatings on metal (tanks, rolls, cookware, glass-cloth impregnation) rather than for structural parts. FEP Dispersion has a yield strength of 12 MPa (1.74 ksi) and a tensile strength of 20 MPa (2.9 ksi) — weaker than 88% of polymer grades. Elongation at break is 250% and the elastic modulus is 0.45 GPa (0.0653 Msi). FEP Dispersion 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 (-130 °F).
Advantages
- Good corrosion resistance — 98/100, better than 99% of polymer grades
- Good UV / weathering resistance — 98/100, better than 99% of polymer grades
- Low moisture uptake — 0.01%, better than 97% of polymer grades
- High service temperature — 200°C (392 °F), better than 87% of polymer grades
- Ductile — tolerates forming and impact — 250%, better than 79% 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
FEP Dispersion properties
Typical room-temperature values for FEP Dispersion; 17 are specific to this condition. Other listed values are FEP reference data and may not represent this condition. Bars are the position among polymer grades.
Physical7
FEP Dispersion 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 (-130 °F).
Mechanical11
FEP Dispersion has a yield strength of 12 MPa (1.74 ksi) and a tensile strength of 20 MPa (2.9 ksi) — weaker than 88% of polymer grades. Elongation at break is 250% and the elastic modulus is 0.45 GPa (0.0653 Msi).
Thermal10
FEP Dispersion is rated for continuous service to 200°C (392 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 56% of polymer grades. Thermal expansion is 100 µm/m·K (55.6 µin/in·°F).
Electrical7
FEP Dispersion is an electrical insulator with a dielectric strength of 60 kV/mm (1,524 V/mil) and a resistivity of 1×10¹⁶ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (98/100), better than 99% of polymer grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of FEP Dispersion takes about 220 MJ of energy and emits 12 kg of CO₂ — more than 90% of polymer grades. Typical recycled content is 0%.
Manufacturability8
FEP Dispersion's machinability is good (55/100, worse than 64% of polymer grades); weldability very good (70/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with FEP Dispersion
Is FEP easy to machine?
Machines easily but is soft and springy — use sharp positive-rake carbide tools, high speed, light feed, and support thin walls; expect elastic recovery, so cut slightly oversize and allow parts to relax before final measurement.
Can FEP be welded?
Fully melt-fusible: hot-gas, heat-sealing, impulse and butt-fusion joining all work above ~300 °C; adhesive bonding requires sodium-etch or plasma surface treatment.
Can FEP be formed, bent or molded?
Extrude/injection mould at 315–380 °C melt with corrosion-resistant (Hastelloy/nickel-alloy) screws and dies; use ~200 °C tool temperature, slow cooling to limit voids, and mandatory HF-rated ventilation.
What surface finishes work on FEP?
Cannot be painted or plated without sodium-naphthalene etch or plasma activation; normally used as-moulded with a naturally low-friction, non-stick, translucent surface.
FEP 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 |
|---|---|---|
| tetrafluoroethylene (TFE)wt% of copolymer backbone | 85 – 95 | 88 |
| hexafluoropropylene (HFP)comonomer that lowers Tm and enables melt processing | 5 – 15 | 12 |
| perfluoro(alkyl vinyl ether) (PPVE)optional third monomer in modified FEP (e.g. FEP-100 series) for crack resistance | 0 – 1 | 0.3 |
FEP Dispersion — frequently asked
What is FEP Dispersion used for?
FEP Dispersion is typically used for high-frequency coaxial cable insulation, corrosion-resistant tubing and pipe linings, transparent chemical labware, solar module and chemical process film, medical catheters and tubing and heat-shrink sleeving. In short: high-heat chemical resistant.
What is the yield strength of FEP Dispersion?
FEP Dispersion has a typical yield strength of 12 MPa (1.74 ksi) and a tensile strength of 20 MPa (2.9 ksi) — weaker than 88% of polymer grades. Strength varies by condition: see the 4 listed tempers.
Is FEP Dispersion easy to machine?
Reasonably — machinability is rated good (55/100, worse than 64% of polymer grades). Machines easily but is soft and springy — use sharp positive-rake carbide tools, high speed, light feed, and support thin walls; expect elastic recovery, so cut slightly oversize and allow parts to relax before final measurement.
Can FEP Dispersion be welded?
Yes — weldability is rated very good (70/100). Fully melt-fusible: hot-gas, heat-sealing, impulse and butt-fusion joining all work above ~300 °C; adhesive bonding requires sodium-etch or plasma surface treatment.
What surface finishes work on FEP Dispersion?
Cannot be painted or plated without sodium-naphthalene etch or plasma activation; normally used as-moulded with a naturally low-friction, non-stick, translucent surface.
Can FEP Dispersion be formed, bent or molded?
Extrude/injection mould at 315–380 °C melt with corrosion-resistant (Hastelloy/nickel-alloy) screws and dies; use ~200 °C tool temperature, slow cooling to limit voids, and mandatory HF-rated ventilation.
What is the maximum service temperature of FEP Dispersion?
FEP Dispersion is rated for continuous use to about 200°C (392 °F), and briefly to 230°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in FEP Dispersion?
Yes — FEP Dispersion 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
- ASTM D2116 – Standard Specification for FEP-Fluorocarbon Molding and Extrusion Materials — ASTM International (2018)
- ASTM D3159 – FEP Fluorocarbon Film (Extruded) — ASTM International (2015)
- Teflon FEP Fluoroplastic Resin – Properties Handbook — Chemours (formerly DuPont) (2019)
- Neoflon FEP Technical Information — Daikin Industries (2020)
- Dyneon FEP Product Comparison Guide — 3M / Dyneon (2018)
- Fluoroplastics Vol. 1 & 2 (Melt-Processible Fluoropolymers) — Ebnesajjad / Elsevier (2015)
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.