| more ABOUT FERRULES 2014 FlipPAGE5 . Price List 2016; (PDF)
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 later being fragile and will not sustain compression by metal ferrules
Metal ferrules normally used by Fittings OEMs such as Swagelok traditionally use metal with their obvious limitations
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
FITTINGS OEMs DON’T necessarily like us as GFs are reusable (with care) and easily slide off the tubing;
The are soft and malleable and deform to fit the shape of the fitting “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
Ther are virtually NO practical temperaure limits (but >450C and up to 1800C in an inert atmosphere)