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AFlex
Hose's Bioflex Hose Liners
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Virgin PTFE Liner |
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Purpose
- Bioflex GP is the 'General Purpose' grade, for use in all
applications where fluids or gases are being conveyed which
do not generate a risk of static charge development (see
'AS') |
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Design - Bioflex GP is a virgin PTFE liner,
manufactured from hose grade PTFE that conforms to the
requirements of USP Class VI and FDA 21 CFR 177.1550
protocols.
EC - Electrical Continuity (between end fittings) When
EC grade is requested, it is necessary that the hose
assembly supplied is electrically continuous, or conductive,
between metal end fittings 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 Bioflex 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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Antistatic PTFE Liner |
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Purpose
- Bioflex AS is an essential requirement in applications
where there is the risk of an electrostatic charge build-up
on the inside surface 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, non-polar organics
and ultra pure (WFI) water which are being transferred at a
medium to high flow velocity. |
All twin or multi phase
media and any non-mixing media, 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.
If in any doubt, please
contact Aflex Hose.
Design
- Bioflex AS is 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 - this is achieved by creating a
highly polished inside surface using techniques which are
unique to Bioflex Hose.
Specifications - When "AS" (Antistatic) grade
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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