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Corroflon Hose Liners
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GP - General Purpose Natural PTFE
Liner |
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Purpose
- Corroflon GP,SS is the general purpose grade of hose and
has been carefully designed to satisfy the widest range of
application requirements. |
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Design - The hose liner is
manufactured from hose quality grade PTFE conforming to FDA
requirements 21 CFR 177.1550 and USP Class VI, extruded in
to tube and helically convoluted. It also includes a heavy
gauge Grade 304 stainless steel reinforcing wire helically
wound into the hose against internal pressure and external
abrasion. |
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AS - Antistatic PTFE Liner |
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Purpose
-
Corroflon AS grade is an essential
requirement in applications where there is the risk of an
electrostatic build up on the inside of the PTFE tube which
may then discharge through the tube wall. Media passing
through which create such a risk are fluids which have a
Conductance of less than 10-7 S/m (Siemens per Meter), such
as fuels, solvents, freons, and non polar organics which are
being transferred at a medium to high flow velocity.
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All twin or multi phase media, and any non mixing, such as
powder in air, or water droplets in steam, in gases or in
oil, also colloidal fluids constitute a particular hazard
for static charge generation, and always require grade AS.
Design
- Corroflon AS
grade has an anti static PTFE liner manufactured from FDA
approved PTFE, and less than 2.5% of "high purity" Carbon
Black material to FDA requirement 21 CFR 178.3297. The
carbon is encapsulated by the PTFE and in normal, non
abrasive applications will not come loose to contaminate any
fluid passing through.
Specifications - When
"AS" (Antistatic) grade hose is specified, then the hose
supplied will be in accordance with the requirements of
BS5958 Part 2, 1991 Clause 19.3, when tested in accordance
with EN ISO 8031 Clause 3.1, which requires that the
resistance between a plug inserted 25mm into the bore at the
end of the hose assembly, and one of the metallic end
fittings should be less than 108 ohms.
NOTE
When in service, at least one end fitting must be connected
to earth, to permit dissipation of the static charge from
the end fitting.
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SP- Special Purpose Liner |
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Purpose
- For application requiring a higher temperature/pressure
rating, greater flexibility and improved kink and
crush resistance. Also for applications requiring
full vacuum resistance for hose sizes larger than
2". |
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Design -
The convolutions
are closer together, yielding greater radial
strength to the hose design.
Specifications -
As for Corroflon
GP, except that the maximum working pressure for
wire braided grades is increased by 25%, the weight
per meter is increased by 30%, the actual through
bore is reduced by 50%, the minimum bend radius is
reduced by 25% and the angle of cleanability is
<80°. Available as SP (Natural) and SP,AS
(Antistatic) Grades.
EC -
Electrical Continuity -
When EC grade is
requested, it is necessary that the hose assembly
supplied is electrically continuous, or conductive,
between metal end fitting at each end of the hose.
The requirements for this are specified in the
German Document BRG132, and the Specification EN ISO
12115, tested to EN ISO 8031 Clause 3.7, which
requires that for hose assemblies with a resistance
between fittings of 102 ohms, a letter "M" can be
applied, or 106 ohms, a letter "Ω" can be applied.
Braided Corroflon Hose Assemblies all meet the
requirements of both "M" and "Ω".
The only exception is for assemblies without braid.
Grade AS,TO (Antistatic, Tube Only) meets the
requirements of "Ω", 106 ohms, but Grade GP,TO
(Natural Tube Only) does not meet either "M" or "Ω" |
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