Vespel
®
Ring
Inlet Seals
Leak-tight inlet seals forAgilent GCs!
At-a-Glance
Product
Information
fromRestek
800-356-1688
814-353-1300
InAgilent split/splitless injection ports, it can be difficult tomake and
maintain a good seal with a conventional metal inlet disk. Themetal-
to-metal seal dictates that the analyst apply considerable torque to the
reducing nut, and, based on our testing, this does not ensure a leak-
tight seal.Over the courseof oven temperature cycling,metal seals are
prone to leaks,whichultimately candegrade the capillary column, and
cause other analytical difficulties.
Restek designed theVespel
®
Ring Inlet Seal to greatly improve injec-
tion port performance. TheVespel
®
Ring Inlet Seal ismade from high-
quality stainless steel and features a Vespel
®
ring embedded into its
face (Figure 1). This softVespel
®
ringwill not harm the critical seal on
the bottom of the injector body, and is outside the sample flow path,
for worry-free chromatography.
The Vespel
®
Ring Inlet Seal is designed to seal even after repeated
temperaturecycles andwithout retightening the reducingnut!Todeter-
mine the variances between traditional seals and theVespel
®
Ring Inlet
Seal, we compared the leak rate for each type of seal at increasing
torque (Figure 2), using a high sensitivity leak detector. Notice how
well theVespel
®
Ring Inlet Seal performs at all levels; it seals equally
effectively at torques of 5lb. or 60lb. (Figure 2).Why trust ametal-to-
metal seal when you can get leak-tight seals quickly, easily, andmore
reliablywith aRestekVespel
®
Ring Inlet Seal?
Vespel
®
Ring Inlet Seals are available in stainless steel, gold-plated,
orwith a Silcosteel
®
coating. Use the stainless steel seals for analyses
of unreactive compounds. To reduce breakdown and adsorption of
active compounds, use gold-plated or Silcosteel
®
-treated seals. The
gold surface offers better inertness than standard stainless steel;
Silcosteel
®
treatment provides inertness similar to that of fused silica
capillary columns.
Feature
Benefit
Lower leak rate thanOEM
metal seals.
Low torque, soft seal,
patent pending design.
Exclusive Vespel
®
ring seals first
time, every time.
Leak-tight connections:
no oxygen leaks into your
carrier gas.
Greater sensitivity (less detector
noise) and longer column life
(no phase oxidation).
Reduceswear, prevents damage
at critical seal: no unexpected
downtime.
Features&Benefits
Figure 2.
AVespel
®
Ring Inlet Seal achieves
leak-tight seals even at low torque, reducing the
chance of leaks.
Torque (in. lbs.)
Leak Rate (Log
10
atm cc/sec.)
0 5 10 15 20 25 30 35 40 45 50 55 60 65
0.01
1E-3
1E-4
1E-5
1E-6
1E-7
1E-8
1E-9
1E-10
Vespel
®
Ring Inlet Seal
Traditional Design
Vespel
®
Ring Inlet Seal Design
Vespel
Figure 1.
the
advantage
The soft ring in a Vespel
®
Ring Inlet Seal will not harm the
critical seal or contaminate your sample,
and you’ll get a leak-tight seal every time!
®
Stainless Steel
Original Equipment
Inlet Seal
