the
★
2004
vol.2
Advantage
Innovators of HighResolution
Chromatography Products
Dual Vespel
®
Ring
Inlet Seal
Pg.1
Fast Analysis of Semivolatile
Organicswith a 0.18mm ID
Rtx
®
-5Sil MSColumn
Pg.2–3,5
Rtx
®
-35AmineColumn Improves
Analysis of Amines andNitrogen
Heterocyclics
Pg.4-5
GC/ECDAnalysis of OrganochlorinePesticides
or PolychlorinatedBiphenylswith an
Rtx
®
-XLBColumn
Pg.6-8
Recent Literature
Pg.8
Improved SilcoCan
™
Canisters;
Canister Heating Jacket
Pg.9
Inert Fittings andTubing for Demanding
Applications
Pg.10-11
DeactivatingGlass Surfaceswith
Dimethyldichlorosilane
Pg.11
RestekHPLCColumnKits for Faster, Easier
MethodDevelopment
Pg.12
GenuineRestek Replacement Parts for
Beckman andHitachi HPLCSystems
Pg.13
Alumaseal
™
andVespel
®
Ferrules
Pg.14
Restek SolidPhase ExtractionCartridges
for Environmental Applications
Pg.15
Restek-on-the-Road Seminars;
STAR
™
ServiceRewards Program
Pg.16
in this issue
Dual Vespel
®
Ring Inlet Seal
Washerless, Leak-Tight Seal for Agilent GCs
by Donna Lidgett, GCAccessories Product MarketingManager
✔
Vespel
®
ring in bottom surface simplifies installation—eliminates thewasher.
✔
Vespel
®
ring in top surface reduces operator variability by requiringminimal torque to seal.
✔
Prevents oxygen from permeating the carrier gas, increasing column lifetime.
In Agilent split/splitless injection ports, it can be
difficult tomake andmaintain a good seal with a
conventional metal inlet disk. Themetal-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 ametal-to-metal seal when you canmake
leak-tight seals quickly, easily, andmore reliably—
without a washer, with a RestekDual 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.
Restek
Innovation
!
Figure1
TheDualVespel®Ring Inlet Seal
achieves leak-tight seals evenat low torque,
reducing the chanceof leak-relatedproblems.
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 thewasher!
DualVespel®Ring Inlet Seals areavailable in
Siltek™-treated, gold-plated, or untreated
stainless steel.
!
new
★
0.8mm IDDual Vespel
®
Ring Inlet Seal
2-pk./price
10-pk./price
Siltek
™
21242
21243
Gold-Plated
21240
21241
Stainless Steel
21238
21239
1.2mm IDDual Vespel
®
Ring Inlet Seal
2-pk./price
10-pk./price
Siltek
™
21248
21249
Gold-Plated
21246
21247
Stainless Steel
21244
21245
