210
GC ACCESSORIES |
COLUMN INSTALLATION
Ferrules
Encapsulated Ferrules—For
1
/
16
-Inch Compression Fittings
• Reusable—will not deform and stick in fittings.
• Less torque needed to seal ferrule.
• Restek’s unique blend of graphite minimizes fragmentation and outgassing.
Vespel® Ferrules
• 100% high-temperature polyimide.
• Stable to 350°C.
• Durable, leak-tight.
Graphite Ferrules
• Preconditioned to eliminate out-gassing.
• High-purity, high-density graphite.
• Smoother surface and cleaner edges than conventional graphite ferrules.
• Contain no binders that can off-gas or adsorb analytes.
• Stable to 450°C.
Vespel®/Graphite Ferrules
• 60%/40% Vespel®/graphite blend, offering the best combination of sealing and ease
of workability.
• Seal with minimal torque, reusable, and preferred for vacuum and high-pressure
uses.
• Stable to 400°C.
• Recommended for mass spec transfer lines.
Capillary Ferrules—For
1
/
16
-Inch Compression-Type Fittings
Available in Vespel®, graphite, or Vespel®/graphite.
*For micropacked columns.
**For 0.28mm MXT columns.
Compact Ferrules—For Agilent 5890/6890/6850/7890 GCs
Available in graphite or Vespel®/graphite.
Reusable!
Vespel® ferrules
Ferrule ID
Fits Column ID
qty.
cat.#
price
0.4mm
0.25mm
10-pk.
21036
0.5mm
0.32mm
10-pk.
21037
0.8mm
0.53mm
10-pk.
21038
Ferrule ID Fits Column ID qty.
Vespel
Graphite
Vespel/Graphite
0.3mm
< 0.18mm 10-pk.
22213
20233
20275
0.4mm 0.18/0.25/0.28mm 10-pk.
22214
20200
20211
0.4mm 0.18/0.25/0.28mm 50-pk.
—
—
20227
20229
0.5mm
0.32mm
10-pk.
22215
20201
20212
0.5mm
0.32mm
50-pk.
—
—
20228
20231
0.6mm
0.28mm**
10-pk.
—
—
—
—
20232
0.8mm
0.45/0.53mm 10-pk.
22216
20202
20213
0.8mm
0.45/0.53mm 50-pk.
—
—
20224
20230
1.0mm
0.75mm*
10-pk.
22217
21058
24912
1.2mm
0.75mm
10-pk.
22218
—
—
—
—
1.6mm
1.00mm*
10-pk.
—
—
21060
—
—
Ferrule ID
Fits Column ID
qty.
Graphite
Vespel/Graphite
0.4mm
0.25/0.28mm
10-pk.
20250
20238
0.4mm
0.25/0.28mm
50-pk.
20251
20239
0.5mm
0.32mm
10-pk.
21007
20248
0.5mm
0.32mm
50-pk.
21008
20249
0.8mm
0.45/0.53mm
10-pk.
20252
20263
0.8mm
0.45/0.53mm
50-pk.
20253
20264
1.0mm
0.75mm*
10-pk.
21059
21056
1.6mm
1.00mm*
10-pk.
21061
21057
Choosing the Right Ferrule
Although graphite and Vespel
®
/graphite ferrules each
have advantages and disadvantages, the choice of
ferrule composition is largely a personal preference.
Graphite ferrules are soft, easy to seal, stable to
450°C, and contain no binders that might off-gas.
Vespel
®
/graphite ferrules work better for vacuum and
high-pressure applications (e.g., GC/MS) because
they will not fragment or allow oxygen to permeate
into the system, whereas graphite ferrules will.
Because Vespel
®
/graphite ferrules are made from a
harder material, they might require retightening after
several temperature cycles. Alumaseal™ ferrules are
ideal for GC/MS. They will not crack or fragment and
require no retightening after temperature cycles.
graphite ferrules
graphite ferrules
graphite ferrules
tech
tip
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