DualVespel®Ring InletSeals
• Vespel
®
ring embedded inbottom surface eliminates need forwasher.
• Vespel
®
ring embedded in top surface reduces operator variabilityby requiringminimal torque to seal.
• Prevents oxygen frompermeating into the carrier gas, increasing column lifetime.
InAgilent split/splitless injectionports, it can be difficult tomake andmaintain a good seal with a con-
ventional 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
temperaturecycling,metal sealsareprone to leaks,whichultimatelycandegrade thecapillarycolumnand
cause other analytical difficulties.
Our Dual Vespel® Ring Inlet Seal greatly improves injection port performance—it stays sealed, even
after repeated temperature cycles, without retightening the reducing nut! This seal features two soft
Vespel® rings,oneembedded in its top surfaceand theother embedded in itsbottom surface.These rings
eliminate theneed for awasher, andensurevery little torque isneeded tomakea leak-tight seal.The rings
will not harm the critical seal in the injector body, or
any other surface, and are outside the sample flow
path.Tests using ahigh sensitivityhelium leakdetec-
tor showDualVespel®Ring InletSealswill seal equal-
ly effectively at torques from 5 in. lb. to 60 in. lb.
(Figure 1).
Why trust ametal-to-metal seal when you canmake
leak-tight seals quickly and easily—and more reli-
ably—without a washer, with a RestekDual Vespel®
Ring Inlet Seal.Usea stainless steel seal foranalysesof
unreactive compounds. To reduce breakdown and
adsorptionof activecompounds,useagold-platedor
Siltek®-treated seal. The gold surface offers better
inertness than untreated stainless steel; Siltek® treat-
ment provides inertness similar to that of a fused
silica capillary column.
Figure1
TheDualVespel®Ring Inlet Seal achieves
leak-tight seals evenat low torque, reducing the
chanceof leak-relatedproblems.
Inlet Seals
•
800-356-1688
•
12
•
0.8mm IDDual Vespel
®
Ring Inlet Seal
2-pk.
/price
10-pk.
/price
Gold-Plated
21240
$58
21241
$264
Siltek
®
Treated
21242
$58
21243
$264
Stainless Steel
21238
$45
21239
$195
1.2mm IDDual Vespel
®
Ring Inlet Seal
2-pk.
/price
10-pk.
/price
Gold-Plated
21246
$58
21247
$264
Siltek
®
Treated
21248
$58
21249
$264
Stainless Steel
21244
$45
21245
$195
LeakRate (Log
10
atmcc/sec.)
0
20
10
30
40
0.01
1E-3
1E-4
1E-5
1E-6
1E-7
1E-8
1E-9
1E-10
50
60
DualVespel®Ring InletSeal
stainless steel
original equipment
inlet seal
Torque (in. lbs.)
DualVespel®Ring Inlet Seals areavailable in
goldplating, stainless steel, andSiltek® treated.
Vespel® ring seal on top
andbottom surfaces!
Patentpending.
restek
innovation
!
X
ADualVespel®Ring Inlet
Seal eliminates theneed
for awasher!
