FEP Detailed Properties
 (Fluorinated Ethylene Propylene)

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.  

Properties

ASTM or Unit

FEP

MECHANICAL PROPERTIES

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

(psi)
Flexural Modulus
103MPa (103kgf/cm²)

D790

78,000~
92,000

D790

0.5-0.6
(5.5-6.5)

Flex Life
(MIT cycles)

D2176

5,000~
80,000

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

THERMAL PROPERTIES

Melting Point

°C
(°F)

260
(500)

Upper Service
Temperature(20,000h)

°C
(°F)

200
(392)

Flame Rating**

UL 94

V-0

Thermal Conductivity

BTU/hr/ft²/deg F in

1.4

cal/sec/cm²,ºC/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
(°F)

-268
(-450)

ELECTRICAL PROPERTIES

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
ohm/sq.

D257

>10¹⁷

GENERAL PROPERTIES

Chemical/Solvent
Resistance

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