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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 ultimately can degrade the capillary
column and cause other analytical difficulties.
Our patented Dual Vespel® Ring Inlet Seal greatly
improves injection port performance—it stays sealed, even after repeated tem-
perature cycles, without retightening the reducing nut! This seal features two
soft Vespel® rings, one embedded in its top surface and the other embedded in
its bottom surface. These 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 surface, and are outside the
sample flow path. Tests using a high sensitivity helium leak detector show Dual
Vespel® Ring Inlet Seals will seal equally effectively at torques from 5 in. lb. to
60 in. lb. (Figure 1).
Why trust a metal-to-metal seal when you can make leak-tight seals quickly
and easily—and more reliably—without a washer, with a Restek Dual Vespel® Ring Inlet Seal. Use a stainless steel seal for analyses of
unreactive compounds. To reduce breakdown and adsorption of active compounds, use a gold-plated or Siltek®-treated seal. The
gold surface offers better inertness than untreated stainless steel; Siltek® treatment provides inertness similar to that of a fused silica
capillary column.
Figure 1
The Dual Vespel® Ring Inlet Seal
achieves leak-tight seals even at low
torque, reducing the chance of leak-related
problems.
•
22
•
2007 vol. 4
GC Accessories
Dual Vespel® Ring Inlet Seals
Washerless, Leak-Tight Seal for Agilent GCs
• Prevents oxygen from permeating the carrier gas, increasing column lifetime.
• Vespel® ring in top surface reduces operator variability by requiring minimal torque to seal.
• Vespel® ring in bottom surface simplifies installation—eliminates the washer.
Washerless, leak-tight seals for Agilent GCs
0.8mm ID Dual 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 ID Dual 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
Dual Vespel® Ring Cross-Disk Inlet Seals for Agilent GCs
• Ideal for high-flow split applications.
• Washerless, leak-tight seals.
0.8mm ID Dual Vespel
®
Ring Cross-Disk Inlet Seal
2-pk.
/price
10-pk.
/price
Gold-Plated
22083
$66
22084
$295
Siltek
®
Treated
22085
$66
22086
$295
Stainless Steel
22087
$53
22088
$239
Leak Rate (Log
10
atm cc/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
Dual Vespel® Ring Inlet Seal
stainless steel
original equipment
inlet seal
Torque (in. lbs.)
Dual Vespel® Ring Inlet Seals are available in gold plating, stainless steel, and Siltek® treated.
Vespel® ring seal on top
and bottom surfaces!
Patented.
new
!