Graphite/Polyimide Ferrules* for GC & GC/MS

Sizes

Made in Australia by Chromalytic Technology

for Standard Swagelok's / HP Inlet fittings & Other OEM's

Capillary Column ID

Restek Column OD

Cat.#

Ferrule Hole Sizes

Actual Hole Sizes**

0.25mm ID
0.32mm ID
0.53mm ID
0.8mm ID
1/16" ID

0.37 +- 0.04mm
0.45 +- 0.04mm
0.69 +- 0.05mm
0.75mm
1/16"

SF100/M0.4VG
SF100/M0.5VG
SF100/M0.8VG
SF100/M1.0VG
SF100VG

+0.05 -0.00mm
( +0.002 -0.000")
on ALL sizes

0.016-0.018"
0.020-0.022"
0.030-0.033"

0.064-0.065

"Short" HP Vespel Ferrules

NEW !

Cat. #

Ferrule Hole Sizes

Actual Hole Sizes**

0.25mm ID
0.32mm ID
0.53mm ID

0.37 +- 0.04mm
0.45 +- 0.04mm
0.69 +- 0.05mm

VG100/M0.4HP
VG100/M0.5HP
VG100/M0.75HP

+0.05 -0.00mm
(+0.002 -0.000")
on ALL sizes

0.016-0.018"
0.019-0.021"
0.029-0.031"

Packed Column Ferrules

Use with SS columns and glass ( with care )

1/'16" ID
1/8" ID
1/4" ID
3/8" ID
1/2" ID

SF100-VG
SF200-VG
SF400-VG

micropacked columns
Packed columns
ditto
Semi-preparative

NOTE :
Graphite is generally preferred for MOST GC applications

* Tolerances on ID are far more critical compared to Graphite Ferrules

• Please check your actual column OD size before ordering
• Fused Silica capillary columns OD's DO vary from one column manufacturer to another.
• Graphite/PI is extremely hard (relatively non-squashable) and a close fit ( no more than 0.002" oversize ) is necessary, particularly so with the "short" HP ferrule with it's blunt profile.

Above measurements relate to Fused Silica columns produced by Restek

General
Chromalytic Technology actually machines Graphite/Polyimide ferrules in order to obtain the maximum precision - Other "moulded" ferrules do not necessarily have the accuracy or the variation in profile or size that may be required for custom applications

We will machine ferrules to YOUR specifications including reducing ferrules

Tolerances

Lengths ID OD +- 0.002" +0.002 - 0.000" +0.001 -0.000

the Polyimide used by CT is a similar polymer to Vespel. 15% graphite material is preferred as it is harder and less likely to jam in fittings compared to softer 40% graphite material

Vespel and Graphite / Vespel ferrules are also supplied by Chromalytic Tech from Restek
( see latest Restek catalog for details )

Graphite/Polyimide is very hard and will squash down max of
0.05mm (0.002"  )
Graphite will squash
0.25mm (0.010" easily)

Restek Column ID

Column OD

Ferrule ID
Nominal

ID Actual

To Order

Fused Silica

0.10mm

0.363mm+/-0.012

0.40mm

0.016"

SF100/0.4G

0.18

0.363+/-0.012

0.40

0.016"

SF100/0.4G

0.25

0.363+/-0.012

0.40

0.016"

SF100/0.4G

0.32

0.45+/-0.04

0.50

0.021"

SF100/0.5G

0.53

0.69 +/-0.05

0.75

0.029"

SF100/0.75G *

MXT

0.28

0.53 +/-0.025

0.50

0.021"

SF100/0.5VG

0.53

0.74 +/-0025

0.80

0.031"

SF100/0.8VG *

Graphite/Polyimide - Do up finger-tight - then requires 1/2 turn with spanner . Feel is relatively progressive until max pressure with short spanners ( Go by feel until silica in ferrule doesn't slip )
Note : the silica is almost impossible to break inside the ferrule

NEW ! 2005 Graphite/Polyimide now in SHORT Version ( similar to Agilent short GFs )
Works perfectly in standard Swagelok 1/16" Nut - Price 25% less use eg Cat# SF0.4VG

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