Teflon™ FEP
Fluoropolymer Film

Properties Bulletin
Description

Mechanical Toughness

Teflon FEP film is a transparent, thermoplastic filmthat can be heat sealed, thermoformed, vacuum formed,
heat bonded, welded, metalized, and laminated to manyother materials, as well as used as an excellent hot-meltadhesive.

• Superior anti-stick and low frictional properties

This wide variety of fabrication possibilities combines withthe following important properties to offer a unique balanceof capabilities not available in any other plastic film.

• Inert to outdoor exposure; no measurable change after
20 years in Florida™

Chemical Compatibility• Teflon™ FEP film is chemically inert and resistant tovirtually all chemicals, except molten alkali metals,gaseous fluorine, and certain complex halogenatedcompounds, such as chlorine trifluoride, at elevatedtemperatures and pressures.
• Low permeability to liquids, gases, moisture, and organicvapors
Electrical Reliability• Superior reliability and retention of properties over large
areas of film
• High dielectric strength, over 6,500 V/mil for 1-mil film
(260 kV/mm for 0.025-mm film)• No electrical tracking, non-wetting, and/or non-charring• Very low power factor and dielectric constant, only slightchange 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• High resistance to impact and tearing• Useful physical properties at cryogenic temperatures
Long Time Weatherability*• High transmittance of ultraviolet and all, but far, infrared
radiation
Reliability• Teflon™ FEP film contains no plasticizers or otherforeign materials.
• Conventional equipment and techniques can be used
for processing; basic composition and properties will
not be influenced.
• Rigid quality control by Chemours ensures uniform
gauge, void-free film.
Teflon™ FEP Film
The convenience of Teflon™ FEP fluoropolymer ineasy-to-use film facilitates the design and fabricationof this low-friction thermoplastic for all sorts of highperformance jobs. It is transparent and can be heatsealed, thermoformed, welded, and heat bonded.
Superior anti-stick properties make it an ideal releasefilm for many applications. A cementable type with aninvisible 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
fluoropolymer and the wide choice of product dimensions
available from Chemours.

*Type C film is not recommended for outdoor use.

Fluoropolymer Film

Teflon™ FEP

Table 1. Types and Gauges of Teflon™ FEP Fluoropolymer Film
Gauge
50100

175

200

300

500

750

1000

2000

0.5

11.75

235

7.5

1020

12.5

25

44

5075

125190250500Approx. area factor, ft /lb

18090

514530181294.5

Approx. area factor, m /kg

361810.3964

3.82.51.90.95

Thickness, milThickness, µm
22Availability
Type A—FEP, general-purpose

X

X

X

X

X

X

X

X

X

Type C—FEP, one side
cementable

—

X

X

X

X

X

——

—

Type C-20—FEP, both sides
cementable

—

X

—

X

—

X

—

—

—

Note: Each roll of Teflon™ film is clearly identified as to resin type, film thickness, and film type.
FEP: Resin type

500: Film thickness, 500 gauge, 5 mil C: Film type, cementable one side

Typical Properties of Teflon™ FEP Fluoropolymer Film
Typical Valuea
Property

Test Method

SI Units

English Units

Tensile Strength at BreakD882

21 N/mm2

3000 psiElongation at Break

D882

Yield Point

D882

12 MPa1700 psi

Elastic Modulus

D882

480 MPa

70,000 psi

Impact Strength

Chemours pneumatic
impact tester

7.7 X 103 J/m

144 ft-lb/in

Mechanical300%

Folding Endurance (MIT)D2176

10,000 cycles

Tear Strength–Initial (Graves)D1004

2.65 N

270 g force

Tear Strength–Propagating (Elmendorf)

D1922

1.23 N

125 g

Bursting Strength (Mullen)

D774

76 kPa11 psi

D3418 (DTA)

260–280 °C

500–536 °F

255 °C

490 °F

Cenco-Fitch

0.195 W/(m·K)

1.35 Btu·in/(hr·ft2·°F)—1172 J/(kg·K)

0.28 Btu/(lb·°F)

70 °C
51 °C

158 °F124 °F

ThermalMelt Point
Zero Strength Temperatureb

Coefficient of Thermal Conductivity
Specific Heat

D648 Tensile Bars

Heat Deflection Temperature
at 0.46 N/mm2 (66 psi)
at 1.82 N/mm2 (264 psi)
Dimensional Stability

30 min at 150 °C (302 °F)

MD = 0.72% expansion
TD = 2.2% shrinkageANSI/UL 94

VTM-0D2863

95%

Flammability Classificationc
Oxygen Index
For 0.025 mm (1 mil) film at 25 °C (77 °F), unless otherwise specified.

aTemperature at which a film supports a load of 0.14 N/mm2 (20 psi) for 5 sec.

bThis classification rating is not intended to reflect hazards presented by this or any other material under actual fire conditions.

cFluoropolymer Film

Teflon™ FEP

Typical Properties of Teflon™ FEP Fluoropolymer Film (cont'd.)
Typical Valuea
Property

Test Method

SI Units

English Units

260 kV/mm
70 kV/mm6500 V/mil
1800 V/mil

Electrical
Dielectric Strength, short-time, in air at
23 °C (73 °F), 6.35 mm (1/4 in) diameterelectrode, 0.79 mm (1/32 in) radius
60 Hz, 500 V/s rate of rise:
0.025 mm (1 mil) film
0.5 mm (20 mil) film

ASTM D149 Method A

Dielectric Constant
25 °C (77 °F), 100 Hz–1 MHz–40–225 °C (–40–437 °F), 1000 Hz

ASTM D150

Dissipation Factor
25 °C (77 °F), 100 Hz–1 MHz–40–225 °C (–40–437 °F), 1000 Hz–40–240 °C (–40–464 °F), 1 MHz

ASTM D150

Volume Resistivity–40–240 °C (–40–464 °F)

ASTM D257

Surface Resistivity–40–240 °C (–40–464 °F)

ASTM D257

Surface Arc Resistance

ASTM D495>165 secb

Insulation Resistanceat 100 °C (212 °F)
at 150 °C (302 °F)
at 200 °C (392 °F)

Based upon 0.2 MF
wound capacitor sections,using single layer,
Teflon™ 50A film

350,000 Mohm·µF
250,000 Mohm·µF
65,000 Mohm·µF—<0.01%

Continuous exposurein Florida

No adverse effects after 20 yr

ASTM D1434

cm3/m2·24 hr·atmc

2.0
1.93–2.02
0.0002–0.0007
0.00020.0005>1 X 1018 ohm·cm>1 X 1016 ohm/sq

ChemicalMoisture Absorption
Weatherability
Permeability, Gas:
Carbon Dioxide
Hydrogen
Nitrogen
OxygenPermeability, Vapor:
Acetic Acid
AcetoneBenzeneCarbon Tetrachloride
Ethyl Alcohol
HexaneWater

25.9 X 103
34.1 X 103
5.0 X 10311.6 X 103
ASTM E96

g/m2·dg/100 in2·24 hr

6.3
14.7
9.9
4.8
10.7
8.7
7.0

0.41
0.95
0.64
0.31
0.69
0.56
0.40

For 0.025 mm (1 mil) film at 25 °C (77 °F), unless otherwise specified.

aSamples melted in arc did not track.

b

To convert to cm3/(100 in2·24 hr·atm), multiply by 0.0645.

cTeflon™ FEP fluoropolymer is chemically inert and solvent-resistant to virtually all chemicals, except molten alkali metals,
gaseous fluorine, and certain complex halogenated compounds, such as chlorine trifluoride, at elevated temperaturesand pressures.

Fluoropolymer Film

Teflon™ FEP

Property Values of Teflon™ FEP Fluoropolymer Film (cont'd.)
Typical Valuea*
Property

Test Method

SI Units

English UnitsDensity

ASTM D1505

2150 kg/m3

134 lb/ft3

Coefficient of Friction, Kinetic(Film-to-Steel)

ASTM D1894

0.1–0.3

Refractive Index

ASTM D542

1.341–1.347

Solar Transmission

ASTM E-424

96%

Miscellaneous*For 0.025 mm (1 mil) film at 25 °C (77 °F), unless otherwise specified.

HOW TO USE THE TEFLON™ BRAND NAME WITH YOUR PRODUCTTeflon™ is a registered trademark of Chemours for its brand of fluoropolymer resins, coatings, films, and dispersions. The Teflon™ brand name is licensed by Chemours in association with approved applications.
Without a trademark license, customers may not identify their product with the Teflon™ brand name, as Chemours does not sell such offerings with the Teflon™ trademark. Unlicensed customers may refer tothe Chemours product offering with only the Chemours name and product code number descriptor as Chemours sells its product offerings. There are no fair use rights or exhaustion of rights to use the Teflon™
trademark from buying from Chemours, a Chemours customer, or a distributor without a trademark license from Chemours.
If you are interested in applying for a trademark licensing agreement for the Teflon™ brand, please visit www.teflon.com/license
CAUTION: Do not use or resell Chemours materials in medical applications involving implantation in the human body or contact with internal bodily fluids or tissues unless agreed to by Seller in a writtenagreement covering such use. For further information, please contact your Chemours representative. For medical emergencies, spills, or other critical situations, call (866) 595-1473 within the UnitedStates. For those outside of the United States, call (302) 773-2000.
The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

For more information, visit teflon.com/industrial
For sales and technical support contacts, visit teflon.com/industrialglobalsupport© 2017 The Chemours Company FC, LLC. Teflon™ and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and the Chemours Logo aretrademarks of The Chemours Company.
Replaces: K-26941-1
C-10597 (9/17)