more ABOUT FERRULES 2014+ FlipPAGE5 More about Ferrules FLIP-HTML5 Price List 2016; (PDF) more About Ferrules 
Ferrules as used in the Chromtechs’ context . . .
Are leak-tight Pipe-fitting seals connecting Tube Fittings and various type of Tubing; SS, polymeric, glass ceramic , fused silica . . .  in capillary and larger sizes; the latter being “fragile” and will just not sustain compression by metal ferrules.

Metal ferrules normally used by Fittings OEMs such as Swagelok traditionally use metal with their obvious limitations
It’s not even in their pecuniary interest to even make OR re-sell Graphite Ferrules
Metal Once-off use - then you’re /they’re “buggared” !
Graphite Ferrules “slide-off” can be re-used many times but do tend to be  “captured’ in the Nut if over-tightened.

Applications include chromatography connections where gas-tight seals are essential both in positive pressure but also under high Vacuum such as GC/MS where the material used must be high purity and sustainable at up to 450degC nowadays.
Common sizes range from (1/32, 1/16, 1/8, 1/4”OD with IDs tube size as small as 0.3mm up to 2.0”ID and larger for more exotic applications ? ASK!
AS far as we know we are the ONLY OEM of GFS with IDs larger than 1/2” . . . ANYWHERE !

In fact there are few OEMs who make GFS at all . Most Suppliers are in fact Distributors ONLY ( such as Agilent, Thermo, Shimadzu etc and AT MANY TIMES THE PRICE

Graphite Ferrules by FAR are the most Universally applicable

& where the Metal Ferrules are just NOT Good Enough !

FITTINGS OEMs DON’T necessarily like us > as GFs are reusable (with care) and easily slide off the tubing;
They are soft and malleable and deform to fit the shape of the fittings “internals” . . . and help to reduce dead-volume.
They also have similar co-effs of thermal expansion as metal and will not leak under temperature cycling
There are virtually NO practical temperaure limits (but >450C as constraints impose by current Gas Chromatography practices and up to 1800C in an inert atmosphere)

Pressure Limits are at customers discretion
( Straight>> Reducing Type ) >100s psig size gas dependant
DONT USE with Hydrogen/Oxygen Air/ at High Temp >300c ?

see Also >

Graphite Ferrules Graphite Ferrules htm-button

VICI-Valco VICI-Valco acrobat-but

 VICI-AG (Jour)  > VICI-Jour htm-button

Restek acrobat-but

 NEW Biotech (Upchurch) > Biotech htm-button

Ferrules, Graphite Ferrules - ALL Sizes 1/6"  to 2.0"ID

FERRULES Chromalytic Technology  > SHOP: Ferrules

Graphite Ferrules - made in Australia
& the original “Big Deal” !

Graphite Ferrules
Graphite-PolyImide Ferrules

Graphite Ferrules (Shiny Black) Subambient ->450C & > Higher

temps15% Graphite-Polyimide(Vespe)
l Matt Black ~325C long term

vespe lferrules
TeflonFerrules

100% Vespel Ferrules
 (Bown-Orange very hard) ~300C brittle at low

Teflon Ferrules ( to~ 225C ) but Note
 >flow transition at ~28C

ideal for GC ! glass/Packed and fused silica Capillary Columns
but > can diffuse in air > at ultra High Vacuum eg GC/MS inlet / column outlet use ( but at Only ppM levels )

 polyimide > various “subtle” thermal expansion effects !
& generally TOO Hard x for Glass / Ceramic tube useage !
Hardness : 100%Vespel
> 15% Graphite/Vespel > Teflon
>> Graphite ( & malleable )

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