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Formula: FEP
Form: Disk
Material: Fluorinated ethylene propylene (FEP)
CAS Number: 25067-11-2
Commodity: Polymers
Transparency: Clear/Transparent
The FEP Copolymer Disk is part of Goodfellow's extensive range of polymer disks. With 120 variations, this fluoropolymer product offers a balance of properties like high melt viscosity, chemical inertness and electrical insulation. These disks are used across a range of applications like wire and cable insulation, and chemical-resistant linings. The wide selection of sizes and thicknesses makes FEP Copolymer disks suitable for prototyping, research and small-scale production across industries.
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Tolerances

Disk
Thickness ±20%

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

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