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 Encapsulated O-rings
A circular shaped seal with a round cross section consisting of two
components, a PTFE jacket and an internal (core) energizer, which imparts memory to the seal. The encapsulated
o-ring is intended to close off potential leak paths between mating surfaces in both static and dynamic applications.
Encapsulated o-rings are offered in two PTFE grades,
FEP and
PFA with a selection
of three different energizers which give the user a choice depending on temperature and operating environment.
PTFE grades:
FEP
The most versatile when considering overall corrosion resistance, sealing capability and temperature. Temperature
range -450'F to +400'E (-267'C to 205'C).
PFA
A fluorocarbon copolymer similar to FEP but it also offers greatly improved mechanical and creep properties at
elevated operating temperatures. Temperature range -450'F to + 500'E (-267'C to +260'C).
Features:
When considering the encapsulated concept, one should take into account
the many features which FEP and PFA PTFE have to offer:
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Corrosion resistance
Ultra low moisture absorption
Uniformity
Low cold flow
Broad temperature range
Good dialectic properties
Flexibility
Low coefficient of friction
Permeation resistance
Abrasion resistance
Non-flammable
Good impact strength
Excellent resilience
Lubricity
No swelling
Reusable |
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ENCAPSULATED MATERIALS CHART
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| Comparison of Properties |
FEP 160
|
PFA
|
| Excellent resiliency |
1
|
1
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| Corrosion resistance |
1
|
1
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| Mechanical properties of elevated temp |
2
|
1
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| Dielectric properties |
1
|
1
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| Flexibility |
1
|
1
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| Low moisture absorption |
2
|
2
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| Permeation resistance |
2
|
2
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| Cold flow |
4
|
3
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| Non-stick characteristics |
1
|
1
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| Low coefficient of friction |
1
|
1
|
| Abrasion resistance |
3
|
3
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| Operating temperature range |
2
|
1
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| Impact strength |
3
|
2
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| Non-flammability |
1
|
1
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| F.D.A. approval |
yes
|
yes
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| Shore Durometer (D) |
55
|
60
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| Temperature High F |
400
|
500
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| Temperature Low L |
-400
|
-400
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1 - excellent 2 = good 3 = fair 4 = poor
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FDA Approval The United States Federal Food and Drug Administration
has published amendment 21 CFR 177.1550 which permits the use of FEP and PFA as articles or components of articles
intended for use in contact with food. There is no general approval for use of these grades in medical applications.
Please see below for a list of helpful o-ring specific
information.
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O-ring Numbers:
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O-ring Information & Data:
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Shop:
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