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 OEM such as Swagelo 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, with IDs as small as 0.3mm up to 1/”ID and larger for more exotic applications 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 neceessarily like us as GFs are reusable (with care) and easily slide off the tubing; The are soft and maleable and deform to fit the shape of the fitting “internals” . . . help to reduce dead-volume Thay also have similar co-effs of thermal expansion as metal and will not leak under temperature cycling Ther ar virtually NO practical temperaure limits (but >450C in an inert atmospher)
100% Vespel Ferrules (Bown-Orange very hard) ~300C brittle at low temps
15% Graphite-Polyimide(Vespel Matt Black~325C long term
Teflon Ferrules ( to~ 225C) but flow transition at ~28C
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