FEP Film / Sheet

Dupont FEP (fluorinated ethylene propylene) film is a transparent, thermoplastic film that can be heat sealed, thermoformed, vacuum formed, heat bonded, welded, metalized, laminated—combined with dozens of other materials, and can also be used as an excellent hot-melt adhesive and low frictional properties.  This wide variety of fabrication possibilities combines with the following important properties to offer a unique balance of capabilities not available in any other plastic film.

Chemical Compatibility
• DuPont FEP film is chemically inert and resistant to virtually all
chemicals, except molten alkali metals, gaseous fluorine, and
certain complex halogenated compounds such as chlorine
trifluoride at elevated temperatures and pressures.
• Low permeability to liquids, gases, moisture, and organic vapors

Electrical Reliability
• Superior reliability and retention of properties over large areas
of film
• High dielectric strength, over 6500 V/mil for 1 mil film
(260 kV/mm for 0.025 mm film)
• No electrical tracking, non-wetting, and non-charring
• Very low power factor and dielectric constant, only slight
change over wide ranges of temperature and frequency

Wide Thermal Range
• Continuous service temperature –240 to 205°C (–400 to 400°F)
• Melting range 250 to 280°C (500 to 540°F)
• Heat sealable

Mechanical Toughness
• Superior anti-stick and low frictional properties
• High resistance to impact and tearing
• Useful physical properties at cryogenic temperatures
Long Time Weatherability
• Inert to outdoor exposure; no measurable change after 20
years in Florida
• High transmittance of ultraviolet and all but far infrared radiation

• DuPont FEP f lm contains no plasticizers or other foreign
• Conventional equipment and techniques can be used for
processing: basic composition and properties will not be
inf uenced
• Rigid quality control by DuPont ensures uniform gauge,
void-free film

The convenience of FEP f uoropolymer in easy-to-use f lm
facilitates the design and fabrication of this low-friction
thermoplastic for all sorts of high-performance jobs. It is
transparent and can be heat sealed, thermoformed, welded,
and heat bonded.

Superior anti-stick properties make it an ideal release f lm for
many applications. A cementable type with an invisible surface
treatment is available for bonding to one or both sides with
adhesives. This versatility is augmented by the superior
properties of a true melt-processible f uorocarbon and by the
wide choice of product dimensions available from DuPont.