GC Ferrules & Sealing Rings
D44
Scientific Instrument Services, Inc.
™
Phone: 908-788-5550
www.sisweb.com/catalog/08/D44
A
wide variety of materials are utilized for ferrules for use on
gas chromatographs. The chromatographer must deter-
mine the type of ferrule to use based on the properties of
the ferrule material and the chromatography conditions.
Scientific Instrument Services
™
provides a wide selection of fer-
rules manufactured by SGE and S.I.S.
A summary table of the properties of each type of ferrule appears
below:
Material
Temp. Limit
Sealing Properties
Strength
Reusability
Temp. Cycle
Graphite
450°C
Excellent
Poor
Good
Excellent
Graphitized Vespel
300°C
Good
Excellent
Excellent
Excellent
Vespel
™
350°C
Good
Excellent
Excellent
Excellent
PTFE
™
250°C
Excellent
Fair
Good
Poor
Glass-Filled PTFE
250°C
Excellent
Fair
Good
Fair
Silicone ‘O’ Rings
230°C
Good
Fair
Poor
Fair
Ferrules For Gas Chromatographs
Dimensions of fused silica capillary columns
(I.D. vs O.D.) for selection of ferrules
1. Graphitized Vespel may shrink and loosen at
subambient temperatures.
2. Graphitized Vespel will expand and shrink with
changing temperature. Connections should be
retightened a few times when first installed until the
ferrule has settled.
3. Function of ferrule cross sectional area. (1/16"
ferrules may be acceptable while 1/8" and 1/4" ferrule
may be unacceptably permeable).
4. Function of ferrule cross sectional area.
5. Graphite absorbs organics. Avoid contact with flow
path.
6. Small amounts of graphite can enter capillary tubing
during installation. Remove the first 2-3cm of tubing
after insertion to ensure that no particles remain in
the flow path.
7. Due to the hardness of graphitized vespel the ferrule
should be closely matched to the tubing OD to obtain
a good seal.
8. Graphitized Vespel ferrules can sometimes be
reused, but normally will seize.
0.05mm ID x 0.4mm OD
0.10mm ID x 0.4mm OD
0.18mm ID x 0.4mm OD
0.25mm ID x 0.4mm OD
0.32mm ID x 0.5mm OD
0.53mm ID x 0.8mm OD
Part No.
Needs Back
Size
Quant./pkg.
Price / pkg*
Ferrule
I.D.
GTF4-10
Yes
1/4"
10
OTF4-10
No
1/4"
10
OTF8-10
No
1/8"
10
OTF16-10
No
1/16"
10
OTF005
No
0.5mm
10
OTF008
No
0.8mm
10
OTF10
No
1.0mm
10
OTF000
No
No Hole
10
•
Recommended for use on
Glass Jet Separators on Mass
Spectrometers
•
Also Recommended for Glass
GC Columns
•
Maintains the Sealing
Properties of PTFE, but
unlike PTFE, Exhibits Less
Flow at High Temperature
•
Does Not Flake Off Like
Graphite to Clog Jets
•
Maximum Usable
Temperature is 250°C
•
Two Styles Available; Type
GTF Requires A Back
Ferrule, Type OTF Does Not
•
Will Not Stick to Metal or
Glass
*10% discount when purchasing 10 or more packages.
T
hese ferrules are constructed
from glass filled PTFE, giving the
ferrules the sealing properties of
PTFE but minimizing the flow problems
normally encountered with pure PTFE. All
ferrules fit the standard Swagelok, Parker,
SGE and other GC fittings. Glass filled
PTFE ferrules are ideal for use on mass
spectrometer jet separators, glass and
metal GC columns and for glass and fused
silica capillary columns.
Glass Filled PTFE
™
Ferrules
D45
GC Ferrules & Sealing Rings
Scientific Instrument Services, Inc.
™
FAX: 908-806-6631
www.sisweb.com/catalog/08/D45
In addition to the performance features of graphite ferrules
detailed above, the significant advantage of one piece ferrules
is they do not require a back ferrule.
They can be used in Swagelok type fittings and in SGE fit-
tings that use the SGE extended capture nuts (SSNE-16,
SSNE-8, SSNE-4).
SGE OGF - One Piece - combination front and back Graphite Ferrule
S
GE graphite ferrules are 99.95% pure graphite and are
extremely easy to use, for obtaining reliable leak free
connections.
Graphite ferrules can be used with all types of tubing including
glass and are extensively used in SGE injection systems, valves,
fittings and unions. Because graphite does not stick or bind onto the
tubing, graphite may be removed and reused.
Note:
These ferrules are physically soft and for best results
should be tightened “finger tight” plus “half a turn” at a time until gas
tight. This method will ensure the ferrule is reusable and prevent
overtightening which will cause the graphite to flow.
GFF type ferrules may be used with Swagelok type unions, but
back ferrules are required. Back ferrules are not necessary with
SGE unions.
W
L
W
L
SGE GFF - Graphite Front Ferrules 450°C
Part No.
Order code
Fitting Size
Hole Size
W (mm)
L (mm)
Price/Pk of 10
072623
OGF16-16
1/16"
1/16"
3.2
3.7
072627
OGF16-005
1/16"
0.5mm
3.2
3.7
072626
OGF16-008
1/16"
0.8mm
3.2
3.7
0726283
OGF/8/16
1/8"
1/16"
6.4
6.6
072622
OGF8
1/8"
1/8"
6.4
6.6
0726270
OGF8-008
1/8"
0.8mm
6.4
6.6
072628
OGF-812
1/8"
1.2mm
6.4
6.6
0726282
OGF/4/16
1/4"
1/16"
9.6
7.2
0726281
OGF/4/8
1/4"
1/8"
9.6
7.2
072621
OGF/4
1/4"
1/4"
9.6
7.2
0726212
1/4"
6.0mm
9.6
7.2
Part No.
Order code
Fitting Size
Hole Size
W (mm)
L (mm)
Price/Pk of 10
072610
GFF16-005
1/16"
0.5mm
3.2
2.7
072608
GFF16-008
1/16"
0.8mm
3.2
3.5
072607
GFF16-010
1/16"
1mm
3.2
3.0
072606
GFF16-012
1/16"
1.2mm
3.2
3.0
072609
GFF8-012
1/8"
1.2mm
6.4
4.0
072604
GFF/06
6mm
6mm
9.6
4.4
0726151
GFF4-8
1/4"
1/8"
9.5
4.6
072617
GFF4-5/16
5/16"
5/16"
9.5
4.6
072615
GFF3-3/8
3/8"
3/8"
12.7
5.1
072613
GFF2-2
1/2"
1/2"
17.2
6.4
•
Is used in combination with a back ferrule as an alternative
to brass or stainless steel front ferrules in Swagelok™ fittings
•
Used alone with SGE SSN (short) style nuts
•
Used with HP capillary connecting nuts
•
Used without a back ferrule in Swagelock™ or Parker-
Hannifin™ fittings
•
Used with SGE SSNE (long style) nuts
GC Ferrules & Sealing Rings
D46
Scientific Instrument Services, Inc.
™
Phone: 908-788-5550
www.sisweb.com/catalog/08/D46
Specifically shaped for SGE 1/16”, 1/8” and 1/4” stainless steel union they are supplied as standard with a number of SGE products.
Back ferrules are not required.
*Will seal down on to .17mm O.D. tubing **Ion trap detector ferrule for PE, Thermo Finnigan and Varian
Graphitized Vespel Sealing Rings 350°C (SGE Fittings Only) - VSR
Part No.
Order code
Fitting Size
Hole Size
W (mm)
L (mm)
Price / Pk of 10
072661
GVF16/000
1/16"
no hole
3.2
3.7
0726632
GVF16/002
1/16"
0.2mm
3.2
3.7
072659
GVF16/003*
1/16"
0.3mm
3.2
3.7
072663
GVF16/004
1/16"
0.4mm
3.2
3.7
072654
GVF16/005
1/16"
0.5mm
3.2
3.7
072655
GVF16/008
1/16"
0.8mm
3.2
3.7
072658
GVF16/009
1/16"
0.9mm
3.2
3.7
072656
GVF16/010
1/16"
1.0mm
3.2
3.7
072657
GVF16/16
1/16"
1/16"
3.2
3.7
072660
GVF16/(2)-003
1/16" (2 hole)
2 x 0.3mm
3.2
3.7
072662
GVF16/(2)-004*
1/16" (2 hole)
2 x 0.4mm
3.2
3.7
072664
GVF16/(2)-005
1/16" (2 hole)
2 x 0.5mm
3.2
3.7
0726640
GVF16/(2)-005-003
1/16" (2 hole)
0.5 & 0.3mm
3.2
3.7
0726641
GVF16/(2)-004-003
1/16" (2 hole)
0.4 & 0.3mm
3.2
3.7
0726642
GVF16/(2)-005-004
1/16" (2 hole)
0.5 & 0.4mm
3.2
3.7
072665
GVF16/(3)-004*
1/16" (3 hole)
3 x 0.4mm
3.2
3.7
072670
GVF8/000
1/8"
no hole
6.4
7.4
0726701
GVF8/16
1/8"
1/16"
6.4
7.4
072669
GVF8/8
1/8"
1/8"
6.4
7.4
0726703
GVF8/04
1/8"
0.4mm
6.4
7.4
0726702
GVF8/05
1/8"
0.5mm
6.4
7.4
072671
GVF8/08
1/8"
0.8mm
6.4
7.4
0726700
GVF8/2.4
1/8"
2.4mm
6.4
7.4
072674
GVF8(2)-008
1/8" (2 hole)
2 x 0.8mm
6.4
7.4
072666
GVF4/000
1/4"
no hole
9.5
7.4
0726660
GVF4/005**
1/4"
0.5mm
9.5
7.4
072673
GVF4/16
1/4"
1/16"
9.5
7.4
072668
GVF4/8
1/4"
1/8"
9.5
7.4
072667
GVF4/4
1/4"
1/4"
9.5
7.4
0726673
GVF4/60
1/4"
6.0mm
9.5
7.4
072694
MGVF/000
For SGE MVSU mini-union
no hole
072695
MGVF/003*
For SGE MVSU mini-union
0.3mm
072696
MGVF/004
For SGE MVSU mini-union
0.4mm
072697
MGVF/005
For SGE MVSU mini-union
0.5mm
072698
MGVF/008
For SGE MVSU mini-union
0.8mm
072693
MGVF/16
For SGE MVSU mini-union
1/16"
Part No.
Order code
Fitting Size
Hole Size
Price / Pk of 10
0726520
GSR16/16(graphite)
1/16"
1/16"
072653
VSR16/16
1/16"
1/16"
072652
VSR8/8
1/8"
1/8"
072651
VSR4/4
1/4"
1/4"
0726003
GSR 4/4(graphite)
1/4"
1/4"
SGE Graphitized Vespel Ferrules 350°C-GVF - the Standard for GC/MS
T
hese Vespel ferrules contain 15% graphite and are ideal for
glass and fused silica capillary columns. Because these
ferrules are harder, they do not distort and flow as much as
other types and are ideal for butt type connections where the flowpath
might need to be disconnected.
For connecting fused silica tubing we recommend a ferrule size
slightly larger than the O.D. of the column to be selected.
No-hole ferrules are available and can be drilled to suit a particu-
lar application or to seal off a fitting.
Two-hole ferrules can be utilized to split the
column effluent between two detectors or one
detector and a collector. The two-hole ferrule
can also be used for inlet splitting between two
fused silica columns.
Three-hole ferrules are also available for
multiple splitting. To suit the SGE range of mini
unions, special small graphitized vespel fer-
rules are available.
W
L
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