FEP Copolymer Filament

FEP Copolymer Filament, composed of poly(tetrafluoroethylene-co-hexafluoropropylene), combines the outstanding chemical inertness, high thermal stability, and low surface energy of PTFE with the improved melt processability afforded by hexafluoropropylene incorporation. This balance allows for precision extrusion into continuous filament form with excellent flexibility, low dielectric constant, and minimal moisture absorption. Its chemical resistance extends to virtually all acids, bases, and solvents, while its electrical properties remain stable across wide frequency and temperature ranges. Industries utilizing FEP Copolymer Filament include aerospace, telecommunications, and chemical processing. Specific applications include high-frequency cable insulation, chemically resistant braided sleeving for process equipment, and fiber-based components in sensors and piezoelectric devices. In research, FEP filaments serve as robust, low-loss dielectric materials in microwave applications and as base fibers for functional coatings in extreme environments. Their durability, processability, and multifunctional performance secure their importance for both advanced manufacturing and frontier scientific exploration.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Filament

Diameter		±20%
Length		+5% / -1%

Material Properties for Polymers

Chemical Resistance

Element	Value
Acids - concentrated	Good
Acids - dilute	Good
Alcohols	Good
Alkalis	Good
Aromatic hydrocarbons	Good
Greases and Oils	Good
Halogenated Hydrocarbons	Good
Halogens	Good
Ketones	Good

Mechanical Properties

Element	Value
Coefficient of friction	0.27-0.67
Hardness - Rockwell	R25-45, 60 Shore D
Poisson's ratio	0.48
Elongation at break( % )	150-300
Tensile modulus( GPa )	0.5-0.6
Izod impact strength( J m⁻¹ )	999999No Break
Tensile strength( MPa )	14-30

Electrical Properties

Element	Value
Dielectric constant @1MHz	2.1
Dissipation factor @ 1MHz	0.0007
Dielectric strength( kV mm⁻¹ )	20@3.2mm
Surface resistivity( Ohm/sq )	10¹⁶
Volume resistivity( Ohmcm )	10¹⁸

Physical Properties

Element	Value
Flammability	V0
Radiation resistance	Poor
Refractive index	1.344
Resistance to Ultra-violet	Excellent
Limiting oxygen index( % )	95
Water absorption( % )	0.01
Density( gcm⁻³ )	2.15

Thermal Properties

Element	Value
Heat-deflection temperature - 0.45MPa( C )	50
Heat-deflection temperature - 1.8MPa( C )	70
Lower working temperature( C )	-250
Upper working temperature( C )	150-200
Specific heat( J K⁻¹ kg⁻¹ )	1100
Thermal conductivity( W m⁻¹ K⁻¹ )	0.19-0.24@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	83-104