Large Graphite Ferrules > PDF

Standard

> Swagelok SPECS re DIMS generally
Imperial ( 100=1/16” ) & Metric ( -M_ _ )

Customised

 SFOD-ID-L-SL-G ( “ +detail ? ” )
> -ConeAngle(17deg >Swagelok) ,-ConeTip Thickness
(IF required ! ) > All sizes are in mm
( unless “ ( Inch “)  otherwise specified )

Large

Graphite / Teflon (ONLY !) others cost prohibitive > but  ASK !
Metal ? NOT Custom

OUR Standard > Swagelok Fittings ( “typical” DIMs )
> other OEM “copies” may NOT be identical re ALL ( “exact” ) DIMs

Imperial (in)

Metric (mm)

where “100”

=1/16”

Actual OD

/L

/SL

some Dims Actual/Typical

ActualOD

/Lmm

/SL

SFM4-G

6.3

6.4

3.7

SF400PI

1/4”ID

0.373

0.283

0.110

SF400G

0.384

0.268

0.120

SF600G

3/8” ID

SF400/M6G

SF800G

1/2”

SFM8G

SF1000G

5/16”

SFM10.6G(.3.4.5)

13.5

8.3

4.6

SF1200G

3/4”

SFM12G

SF1400G

7/8”

1.15

0.40
(11.27)

0.18

SFM14G(.6)

17.8

(10.0)”

SF1600G

1.0”

1.25”
31.9mm

0.39”
10.8

 0.18
4.8mm

SFM16G

SF2000G

1-1/4”

1.475
31.65 mm

0.55
4.28

0.26
7.23

SFM20G

SF2400G

1-1/2”

1.87

0.79

(0.06)
0.40

SFM25G

30.0

10.2

4.9

SF2800G

1-3/4”

SFM28G

SF3000G

1-7/8”

SFM32G

42.18
31.93

18.62

SF3200G

2.0”

2.56

1.05

0.30
(0.07)>

see pic >
more details

? but to be confirmed

( Imperial Swagelok )

actual ODn”/in

L

SL

{ Metric
Swagelok )

actual ODmm

L

SL

large GFs (1-1//2-2”ID ) we are recommending using a SL metal backing Ferrule (yours), L can be easily adjusted to suit > Now(2022+) as our Standard !
smaller(<<1.5”) ID GFs are still a one-piece design ! BUT ASK ! > Confirm !
Typical Tolerance L +/- 0.1mm OD +/-0.1 ID +0.05mm

SF2.56/2.00/1.05/0.30/(0.07)-G

Imperial +/-  in / ” Tolerance

+0.002

-0.002

0.005

0.005

Overall Length
is an “easy” adjustment for Us !

NO Tooling Costs Apply for “Standard” Ferrules . . . 
> OR NON-Standard “negotiable”  !
> with YOUR Fitting sample & DIMS provided > but depending on difficulty !
ie re >Wall Thckness & Length

• Graphite Ferrules are UNIQUE

• Soft > Malleable & squash into Shape > in-situ !
  BUT STILL relatively FRAGILE > Handle with Care !

• DISCLAIMER > over-ride
  Thread & Inner profile of NUT invariably results in extrusion of the Graphite into the threads etc > some applications the ferrules may be marginally COMPROMISED re compression Density !

• ASK > for recommendations in these “extreme” situations !

• NOT All DIMS are in fact feasible > a L and Wall Thickness compromise !

• Custom Tooling : Small <1/2”ID $100; Large >1/2” - 1”ID; $175 1-2”$210 - IF required ?
  > ASK !

• “some” Limitations > Size vs Wall thickness vs Length > ASK !

• Graphite Ferrules are NOT machined as such \ but compressed in a “Die Set” !)

• > Soft / Malleabe & CAN be squashed in-situ into shape ( but marginally ? > by a few “thous” w/o losing integrity )

• BUT High Compression Moulding in a Tooling “Die Set”
  Extreme Pressures R used ( but Graphite is “elastic”) and the laminated format whilst a good compromise can still result in trace Air infusion / leaks under high vacuum (GC/MS Apps).
  This is minimised by high torque tightening in a “truly captured” fitting format ! In situ torque tightening The NUT > much higher compression  ( straight GFs “properly captured )
    
  Limit Overtightening breaking fragile tubes with an appropriate” Torque Wrench “ !
   

• ALWAYS TRIAL TEST RE- SAFETY ! > & Can be highly APP DEPENDENT !
  re temperature and Pressure > Graphite has a LOW co-eff of friction ! > re end Pressure !
  RE Supporting extreme weights in a Vertical position > Tube may tend to “slide” > out !
  > an EXTREME situation > TEST Safely . . . but Be-A-Ware !

NOTE : CHROMTECH is the ONLY known OEM WW of these
Unique Large Graphite Ferrules !
even Swagelok ! > Not in THEIR Interest ? > Scope !
ie Just too Good ! . . . for some APPs !
> but “even” SS Ferrules Can Be “problematic” !

AND WE were the “prime” Inventor of GFs for Chromatogtaphy Use !
( from > the ‘70s+ ) & the source of Many OEM “copy-cats” since !

Small GFs : Ferrules in General
SHOP Cart Ferrules
MalsCart > some Ferrules
also this Site >
 * https://www.chromtech.net.au/
chrom-ferrules-ct.htm

Large GFs PDF
GF Spec Data Sheet PDF
PDF Ferrules List
FlipHTML5 Ferrules
* ALT SHOP GFs

Large GFs >10mm

* Custom Tooling Cost >
( <12mm ID) $115 )
12-25mm ID $175; 25-50mmID
$220.00 ea perSet
“once-off” charge if the size is NOT already an in-stock Melb item !

We will ask firm order(er)s to specify / verify the exact DIMs preferred and
We THEN Supply OUR  nearest “suitable” re OD /L /SL /
 ( & the Cone“Tip” strengthened >
re fragility ! where necessary ! ( > ~0.5mm )
> else a Tooling Cost Applies
INSUFFICIENT Details THEN
> NO Order will be processed !
Nor for “impossible” specs !

* for YOUR “DIM” Inaccuracies ?
> NO Returns accepted !

some
APPS

• General Purpose Ferrules -

• Replaceable ( IE Nut & GF simply slides OFF! ), ( cost savings ! > eg for protypes & re-usable ! ) The GF actually “extrudes” into the thread of the Nut and can’t be easily removed intact !
  > LOW Cost> re-Usable ! ( with Care ! ) compared to Metal(SS)

• Reducing Ferrule Apps ( compared to expensive metal fittings )

• Mainly Low(er) Pressure ! ( <<1000psi depending on size ? )

• HIgh Temperature APPS >1000C in inert atmosphere ( furnace tubes )

• Gas Chromatography Columns, Inlet Liners

• Glass / Ceramic ( Catalyst )Tubes  > eg Gas Generators

• HighTemp Spectra Cells “ Glass / Quartz { for  eg IR, FTIR
  ( higher VOCs > ~C20 )

• -    where Size DIMs eg OD are far more critical to fit & seal !
  NOT RECOMMENDED For High/Vacuum OR many GC/MS APPs > Use OK IFUpstream +ve Pressure and/or custom “Capture-Type” GF Fittings > ASK !
  eg Fisons> CarloErba

In Fact

The UNIVERSAL Ferrule for many APPS
SOFT & Malleable material NOT Amorphous ! NOT Fragile ! Except large Ferrules Handle with Care ! > certainly
NOT like  “Hard”  “pencil-type” amorphous Graphite !
 where normal metal Ferrules might be Useless ! in fact ?
> & tend to break or distort glass, ceramic > metal tubing !
( & fittings particularly IF / When Overtightened !
always use a Torque Wrench for these ! )

• what’s-more ! with care the GFs can be reused !
  > & the Nut & GF simply slides-off the tube !
  Retain the GF inside the NUT as It extrudes into the Nut Thread
  trying to remove it will in fact destroy the GF !
  > The “captured” GF inside the “nut” is Then re-useable  !
  with Care > & Many Times ? > a significant cost saving !

• GFs do NOT require any metal “backing” ferrule !
   . . . except for large sizes 1.5, 1.75, 2.0”ID where
  Your “existing” SL backing ferrule may be required > useful  ! . . .
  ( and they use much less graphite for us & thus easier to make ! )

for OPTIMUM Performance > Use OUR recommended SPECs
> as many compromises are possible ELSE > a DISCLAIMER !
NOT ALL Your wishes are necessarily Practical ! either !
Large GFs ( >1.5:ID) >  Default WE Now assume you will use a Swagelok SS Backing Ferrule ( yours ! ) ASK ! _ 4 Our ease of production !

> THE Perfect “Universal“ Ferrule material !
& “proven” over 45 years since we first “adopted “ IT !
But IF U Ever happen to Find Anything better ? > then TELL US !
as we are always interested in NEW > Innovative Ideas !

GF Tooling Cost ONLY IF NOT in Stock in Melbourne
Small AUD $120  ~ 1/16 to 1/2”ID
Medium $160 > 1/2 to 1”
Large $220 >1.0” to 2.0 ”ID
A ONCE -OFF Charge ! . . . ONLY ! > initially !

Applies ONLY for Custom OD or ID
> Variable Overall Length @ No Extra Charge !
Cone Shape is “Fixed” ~17deg for Standard Swagelok

Chromtech.net.au > Chromtech-AUS.com > Chromalytic.net.au

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