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the
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2004 vol. 2
Advantage
Innovators of High Resolution
Chromatography Products
Dual Vespel® Ring
Inlet Seal
Pg. 1
Fast Analysis of Semivolatile
Organics with a 0.18mm ID
Rtx® -5Sil MS Column
Pg. 2–3, 5
Rtx®-35 Amine Column Improves
Analysis of Amines and Nitrogen
Heterocyclics
Pg. 4-5
GC/ECD Analysis of Organochlorine Pesticides
or Polychlorinated Biphenyls with an
Rtx®-XLB Column
Pg. 6-8
Recent Literature
Pg. 8
Improved SilcoCan™ Canisters;
Canister Heating Jacket
Pg. 9
Inert Fittings and Tubing for Demanding
Applications
Pg. 10-11
Deactivating Glass Surfaces with
Dimethyldichlorosilane
Pg. 11
Restek HPLC Column Kits for Faster, Easier
Method Development
Pg. 12
Genuine Restek Replacement Parts for
Beckman and Hitachi HPLC Systems
Pg. 13
Alumaseal™ and Vespel® Ferrules
Pg. 14
Restek Solid Phase Extraction Cartridges
for Environmental Applications
Pg. 15
Restek-on-the-Road Seminars;
STAR™ Service Rewards Program
Pg. 16
in this issue
Dual Vespel® Ring Inlet Seal
Washerless, Leak-Tight Seal for Agilent GCs
by Donna Lidgett, GC Accessories Product Marketing Manager
✔ Vespel® ring in bottom surface simplifies installation—eliminates the washer.
✔ Vespel® ring in top surface reduces operator variability by requiring minimal torque to seal.
✔ Prevents oxygen from permeating the carrier gas, increasing column lifetime.
In Agilent split/splitless injection ports, it can be
difficult to make and maintain a good seal with a
conventional metal inlet disk. The metal-to-metal
seal dictates that you apply considerable torque to
the reducing nut, and, based on our testing, this
does not ensure a leak-tight seal. Over the course of
oven temperature cycling, metal seals are prone to
leaks, which ulti-
mately can degrade
the capillary col-
umn and cause
other analytical dif-
ficulties.
Our Dual Vespel®
Ring Inlet Seal*
greatly improves
injection port per-
formance—it stays
sealed, even after repeated temperature cycles, with-
out retightening the reducing nut! This seal, a new
version of our popular Vespel® Ring Inlet Seal, fea-
tures two soft Vespel ® rings, one embedded in its
top surface and the other embedded in its bottom
surface. The Vespel® rings eliminate the need for a
washer, and ensure very little torque is needed to
make a leak-tight seal. The rings will not harm the
critical seal in the injector body, or any other sur-
face, and are outside the sample flow path. Tests
using a high sensitivity helium leak detector show
Dual Vespel® Ring Inlet Seals will seal equally effec-
tively at torques from 5 to 60 in. lb. (Figure 1).
Why trust a metal-to-metal seal when you can make
leak-tight seals quickly, easily, and more reliably—
without a washer, with a Restek Dual Vespel® Ring
Inlet Seal. Use an untreated stainless steel Dual
Vespel® Ring Inlet Seal for analyses of unreactive
compounds. To reduce breakdown and adsorption
of active compounds, use a Siltek ™ -treated or gold-
plated seal. Siltek™ treatment provides the highest
level of inertness.
Res tek
Innovation !
Figure 1 The Dual Vespel® Ring Inlet Seal
achieves leak-tight seals even at low torque,
reducing the chance of leak-related problems.
Leak Rate (Log
10 atm cc/sec.)
0 10 20 30 40
0.01
1E-3
1E-4
1E-5
1E-6
1E-7
1E-8
1E-9
1E-10
50 60
Dual Vespel® Ring Inlet Seal
stainless steel
original equipment
inlet seal
Torque (in. lbs.)
*Patent pending.
Eliminate the washer!
Dual Vespel® Ring Inlet Seals are available in
Siltek™-treated, gold-plated, or untreated
stainless steel.
!
new
★
0.8mm ID Dual Vespel® Ring Inlet Seal 2-pk./price 10-pk./price
Siltek™ 21242 21243
Gold-Plated 21240 21241
Stainless Steel 21238 21239
1.2mm ID Dual Vespel® Ring Inlet Seal 2-pk./price 10-pk./price
Siltek™ 21248 21249
Gold-Plated 21246 21247
Stainless Steel 21244 21245