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FEP (Fluorinated Ethylene Propylene) Detailed Properties

[PDF version]

Simply use the links below to view test reports.
[Silicone] [Viton™] [EPDM] [FEP] [PFA]

The table below lists a generally accepted summary of properties that we believe to be reliable. Please note that many of these resins are produced in several varieties and property characteristics may vary. Therefore, determination of resin is dependent on the application and this table is only meant to serve as a general guideline.

FEP Properties ASTM or Unit FEP


Specific Gravity D792 2.15
Elongation % D638 250~330
Tensile Strength (psi) D638 2,800~5,000
Flexural Strength (psi) D790 no break
Compressive Strength D695 2,200
Tensile Elastic Modulus 
(Young's Modulus) (psi)
D638 50,000
Flexural Modulus
103MPa (103kgf/cm2)
D790 78,000~
D790 0.5-0.6
Flex Life
(MIT cycles)
D2176 5,000~
Hardness Durometer
  Shore D
D636 D55
Coefficient of Friction on steel 0.05
Abrasion Resistance
1000 revs.
Taber 14~20
Impact Strength IZOD
73°F/23°C, notched ft/lbs/in
D256 no break


Melting Point °C
Upper Service
Flame Rating** UL 94 V-0
Thermal Conductivity BTU/hr/ft2/deg F in 1.4
cal/sec/cm2,°C/cm 6 x 10-4
Linear Coefficient of Thermal Expansion 10-5 °C D696 8.3~10.5
Heat of Fusion BTU/LB 11
Heat of Combustion BTU/LB 2200
Low Temperature Embrittlement °C


Dielectric Constant D150/103Hz 2.1
D150/106Hz 2.1
Dielectric Strength
10 mil film
D149 >2000
Volume Resistivity ohm-cm D257 >1018
Surface Resistivity
D257 >1017


D543 Excellent
Water Absorption, 24h % <0.01
Deformation Under Load *D621/100°C 5.0
**D621/25°C 3.0
Refractive Index   1.338
Limiting Oxygen Index >95 >95
Properties ASTM or Unit FEP

Design Recommendation Disclaimer:
Recommendations on application design and material selection are based upon available technical data and are offered as suggestions only. Each user should conduct evaluations to determine the suitability for his particular application. ROW, Inc. offers no express or implied warranties concerning the form, fit, or function of a product in any application.

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