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
Part #GTF410--Click to request quote
DISCONTINUED
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Yes
1/4"
10
OTF4-10
Part #OTF410--Click to order
Current Price: $14.00
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=45
No
1/4"
10
OTF8-10
Part #OTF810--Click to order
Current Price: $14.00
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=39
No
1/8"
10
OTF16-10
Part #OTF1610--Click to order
Current Price: $16.92
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
No
1/16"
10
OTF005
Part #OTF005--Click to order
Current Price: $23.10
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
No
0.5mm
10
OTF008
Part #OTF008--Click to order
Current Price: $23.10
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
No
0.8mm
10
OTF10
Part #OTF10--Click to order
Current Price: $23.10
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
No
1.0mm
10
OTF000
Part #OTF000--Click to order
Current Price: $22.00
(10 or more: 5% off; 50 or more: 10% off)
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
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
Part #072623--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF16-16
1/16"
1/16"
3.2
3.7
072627
Part #072627--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=1
OGF16-005
1/16"
0.5mm
3.2
3.7
072626
Part #072626--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF16-008
1/16"
0.8mm
3.2
3.7
0726283
Part #0726283--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF/8/16
1/8"
1/16"
6.4
6.6
072622
Part #072622--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF8
1/8"
1/8"
6.4
6.6
0726270
Part #0726270--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF8-008
1/8"
0.8mm
6.4
6.6
072628
Part #072628--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF-812
1/8"
1.2mm
6.4
6.6
0726282
Part #0726282--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF/4/16
1/4"
1/16"
9.6
7.2
0726281
Part #0726281--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF/4/8
1/4"
1/8"
9.6
7.2
072621
Part #072621--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
OGF/4
1/4"
1/4"
9.6
7.2
0726212
Part #0726212--Click to order
Current Price: $30.00
Unit of Measure:
PK
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
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
Part #072610--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF16-005
1/16"
0.5mm
3.2
2.7
072608
Part #072608--Click to order
Current Price: $33.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF16-008
1/16"
0.8mm
3.2
3.5
072607
Part #072607--Click to order
Current Price: $33.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF16-010
1/16"
1mm
3.2
3.0
072606
Part #072606--Click to order
Current Price: $33.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF16-012
1/16"
1.2mm
3.2
3.0
072609
Part #072609--Click to order
Current Price: $30.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF8-012
1/8"
1.2mm
6.4
4.0
072604
Part #072604--Click to order
Current Price: $33.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF/06
6mm
6mm
9.6
4.4
0726151
Part #0726151--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF4-8
1/4"
1/8"
9.5
4.6
072617
Part #072617--Click to order
Current Price: $56.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=2
GFF4-5/16
5/16"
5/16"
9.5
4.6
072615
Part #072615--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GFF3-3/8
3/8"
3/8"
12.7
5.1
072613
Part #072613--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
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
Part #072661--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/000
1/16"
no hole
3.2
3.7
0726632
Part #0726632--Click to order
Current Price: $60.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/002
1/16"
0.2mm
3.2
3.7
072659
Part #072659--Click to order
Current Price: $57.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=2
GVF16/003*
1/16"
0.3mm
3.2
3.7
072663
Part #072663--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=22
GVF16/004
1/16"
0.4mm
3.2
3.7
072654
Part #072654--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=10
GVF16/005
1/16"
0.5mm
3.2
3.7
072655
Part #072655--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/008
1/16"
0.8mm
3.2
3.7
072658
Part #072658--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/009
1/16"
0.9mm
3.2
3.7
072656
Part #072656--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/010
1/16"
1.0mm
3.2
3.7
072657
Part #072657--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=5
GVF16/16
1/16"
1/16"
3.2
3.7
072660
Part #072660--Click to order
Current Price: $62.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/(2)-003
1/16" (2 hole)
2 x 0.3mm
3.2
3.7
072662
Part #072662--Click to order
Current Price: $60.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/(2)-004*
1/16" (2 hole)
2 x 0.4mm
3.2
3.7
072664
Part #072664--Click to order
Current Price: $62.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/(2)-005
1/16" (2 hole)
2 x 0.5mm
3.2
3.7
0726640
Part #0726640--Click to order
Current Price: $62.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/(2)-005-003
1/16" (2 hole)
0.5 & 0.3mm
3.2
3.7
0726641
Part #0726641--Click to order
Current Price: $62.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/(2)-004-003
1/16" (2 hole)
0.4 & 0.3mm
3.2
3.7
0726642
Part #0726642--Click to order
Current Price: $62.00
Unit of Measure:
PK
Quantity in Stock=1
GVF16/(2)-005-004
1/16" (2 hole)
0.5 & 0.4mm
3.2
3.7
072665
Part #072665--Click to order
Current Price: $70.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF16/(3)-004*
1/16" (3 hole)
3 x 0.4mm
3.2
3.7
072670
Part #072670--Click to order
Current Price: $51.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/000
1/8"
no hole
6.4
7.4
0726701
Part #0726701--Click to order
Current Price: $48.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/16
1/8"
1/16"
6.4
7.4
072669
Part #072669--Click to order
Current Price: $46.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/8
1/8"
1/8"
6.4
7.4
0726703
Part #0726703--Click to order
Current Price: $48.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/04
1/8"
0.4mm
6.4
7.4
0726702
Part #0726702--Click to order
Current Price: $48.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/05
1/8"
0.5mm
6.4
7.4
072671
Part #072671--Click to order
Current Price: $52.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/08
1/8"
0.8mm
6.4
7.4
0726700
Part #0726700--Click to order
Current Price: $48.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8/2.4
1/8"
2.4mm
6.4
7.4
072674
Part #072674--Click to order
Current Price: $61.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF8(2)-008
1/8" (2 hole)
2 x 0.8mm
6.4
7.4
072666
Part #072666--Click to order
Current Price: $48.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=1
GVF4/000
1/4"
no hole
9.5
7.4
0726660
Part #0726660--Click to order
Current Price: $48.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF4/005**
1/4"
0.5mm
9.5
7.4
072673
Part #072673--Click to order
Current Price: $46.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF4/16
1/4"
1/16"
9.5
7.4
072668
Part #072668--Click to order
Current Price: $46.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF4/8
1/4"
1/8"
9.5
7.4
072667
Part #072667--Click to order
Current Price: $46.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=8
GVF4/4
1/4"
1/4"
9.5
7.4
0726673
Part #0726673--Click to order
Current Price: $48.00
Unit of Measure:
PK
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GVF4/60
1/4"
6.0mm
9.5
7.4
072694
Part #072694--Click to order
Current Price: $45.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
MGVF/000
For SGE MVSU mini-union
no hole
072695
Part #072695--Click to order
Current Price: $45.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
MGVF/003*
For SGE MVSU mini-union
0.3mm
072696
Part #072696--Click to order
Current Price: $45.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
MGVF/004
For SGE MVSU mini-union
0.4mm
072697
Part #072697--Click to order
Current Price: $45.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
MGVF/005
For SGE MVSU mini-union
0.5mm
072698
Part #072698--Click to order
Current Price: $45.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
MGVF/008
For SGE MVSU mini-union
0.8mm
072693
Part #072693--Click to order
Current Price: $45.00
Unit of Measure:
PK
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
MGVF/16
For SGE MVSU mini-union
1/16"
Part No.
Order code
Fitting Size
Hole Size
Price / Pk of 10
0726520
Part #0726520--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
GSR16/16(graphite)
1/16"
1/16"
072653
Part #072653--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
VSR16/16
1/16"
1/16"
072652
Part #072652--Click to order
Current Price: $40.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
VSR8/8
1/8"
1/8"
072651
Part #072651--Click to order
Current Price: $45.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
VSR4/4
1/4"
1/4"
0726003
Part #0726003--Click to order
Current Price: $41.00
Unit of Measure:
PK
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
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.
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