Fluoropolymer Comparison - Typical Properties
The values shown represent average experiences from numerous testing sources and are not intended to be specifications.
Mechanical Properties
|
|
ASTM Standard |
Unit |
PTFE
|
FEP |
PFA |
ETFE |
|
Specific Gravity |
D792 |
-- |
2.15 |
2.15 |
2.15 |
1.76 |
|
Tensile Strength |
D1457
D1708
D638 |
MPa
(psi) |
21-34
(3,000-5,000) |
23
(3,400) |
25
(3,600) |
40-46
(5,800-6,700) |
|
Elongation |
D1457
D1708
D638 |
% |
300-500 |
325 |
300 |
150-300 |
|
Flexural Modulus |
D790 |
MPa
(psi) |
496
(72,000) |
586
(85,000) |
586
(85,000) |
1,172
(170,000) |
|
Folding Endurance |
D2176 |
(MIT)
cycles |
>106 |
5-80 x 103 |
10-500 x 103 |
10-27 x 103 |
|
Impact Strength |
D256 |
J/m
(ft·lb/in) |
189
(3.5) |
No Break |
No Break |
No Break |
|
Hardness |
D2240 |
Shore D pencil |
50-65 HB |
56
HB |
60 |
72 |
|
Coefficient of Friction, Dynamic |
D1894 |
-- |
0.05-0.10 |
0.08-0.3 |
-- |
0.3-0.4 |
Thermal Properties
|
|
ASTM Standard |
Unit |
PTFE
|
FEP |
PFA |
ETFE |
|
Melting Point |
D3418 |
°C
(°F) |
327
(621) |
260
(500) |
306
(582) |
267
(512) |
|
Cure
Temperature |
-- |
°C
(°F) |
379-429
(715-805) |
360-385
(680-725) |
379-399
(715-750) |
302-323
(575-615) |
|
Flame Rating* |
UL94 |
-- |
V0 |
V0 |
V0 |
V0 |
|
Limiting Oxygen Index |
D2863 |
% |
>95 |
>95 |
>95 |
30-36 |
|
Heat of Combustion |
D240 |
MJ/kg
(Btu/lb) |
5.1
(2,200) |
5.1
(2,200) |
5.3
(2,300) |
13.7
(5,900) |
* Statements regarding behavior in a flame situation are not intended to reflect hazards presented by this or any other material when under actual fire conditions.
Chemical Properties
|
|
ASTM Standard |
Unit |
PTFE
|
FEP |
|
ETFE |
|
Chemical/Solvent Resistance |
D543 |
-- |
Excellent |
Excellent |
Excellent |
Excellent |
|
Water Absorption, 24 h |
D570 |
% |
<0.01 |
<0.01 |
<0.03 |
<0.03 |
|
Salt Spray Resistance (1)
-on aluminum
-on steel |
B-117 |
Hours
Hours |
744+
192 |
744+
-- |
1000
-- |
1000
-- |
|
Detergent Resistance (2)
-on aluminum
-on grit-blasted aluminum
-on grit-blasted steel |
-- |
Hours
Hours
Hours |
264
624
24 |
744
600
480 |
--
--
-- |
--
--
-- |
|
Weather Resistance |
Florida Exposure |
Years Unaffected |
20 |
20 |
10 |
15 |
Notes:
1. Salt Spray Resistance: 5% NaCl at 35°C/95°F, hours to failure
2. Detergent Resistance: hours to failure
Electrical Properties
|
|
ASTM Standard |
Unit |
PTFE |
FEP |
|
ETFE |
|
Dielectric Constant |
D150 |
1 MHz |
2.1 |
2.1 |
2.1 |
2.6 |
|
Dielectic Strength* |
D149 |
V/µm |
18 |
53 |
80 |
79 |
|
Dissipation Factor |
D150 |
1 MHz |
<0.0001 |
0.0006 |
0.0001 |
0.007 |
|
Arc Resistance |
D495 |
sec |
>300 |
300 |
>180 |
122 |
|
Volume Resistivity |
D257 |
ohm·cm |
>1018 |
>1018 |
>1018 |
>1017 |
|
Surface Resistivity |
D257 |
ohm/sq |
>1018 |
>1016 |
>1017 |
>1015 |
* Dielectric Strength: 100 micrometers film
Vapor Transmission Rates
Vapor Transmission Rates of FEP Film, 25 µm (1 mil) thickness/per ASTM E-96 (modified)
Values measured on thicker specimens and converted to 25 µm (1 mil)
|
|
|
|
|
Acetic Acid |
35 |
0.41 |
|
Acetone |
35 |
0.95 |
|
Acetophenone |
25 |
0.50 |
|
Benzene |
35 |
0.64 |
|
Carbon Tetrachloride |
35 |
0.31 |
|
Etyl Acetate |
35 |
0.76 |
|
Hexane |
35 |
0.56 |
|
Hydrochloric Acid, 20% |
25 |
<0.01 |
|
Piperidine |
25 |
0.04 |
|
Red Fuming Nitric Acid |
25 |
7.5-1.4 |
|
Sodium Hydroxide, 50% |
25 |
<0.01 |
|
Sulfuric Acid, 98% |
25 |
0.00001 |
|
Water |
39.5 |
0.40 |
|
|
