restekadv07 - page 37

• 4 • 800-356-1688 •www.restek.com 2004vol. 3
Siltek™ andSilcosteel®-CRTreatedFittings
andTubing forDemandingApplications
by Gary Barone, Restek Performance CoatingsDivision
•Siltek™ treatment for exceptional inertness.
•Silcosteel®-CR treatment for protection from acids or seawater.
•Treated surfaceswill not chip, flake, or delaminate.
•Custom treatment available.
Siltek™ andSilcosteel®-CRTreated
Swagelok® Fittings
Swagelok® fittings areworld-renowned for
meeting demanding standards. Now, awide
selection of Swagelok® products, available from
stockwith Restek's unparalleled surface treat-
ments, set the high-
est standards for
inertness and corro-
sion resistance.
Siltek™ treated fit-
tings ensure ultimate
inertness, and are
the ideal choice for
systems used to col-
lect, store, and trans-
fer active compounds.*Themost reactive sam-
ple components can be retained in a Siltek™
treated system: even at parts-per-billion levels,
sulfur-containing compounds, chlorinated pesti-
cides, or other very active compounds exhibit
virtually no adsorption. And, unlike coatings, the
protective layer produced by Siltek™ or other
Restek treatments is integral with the surface -
it will not chip, flake, or delaminate, not even in
themost stressful applications.
Silcosteel®-CR treatment is highly effective pro-
tection for stainless steel exposed to hydrochlo-
ric acid, nitric acid, or sulfuric acid, or tomarine
environments. In independent tests, Silcosteel®-
CR treatment upgraded the corrosion resistance
of 300-grade stainless steel by an order of mag-
nitude (Table 1) and totally protected samples
against crevice corrosion (Figure 1).
If you need to construct a tubing system for a
demanding application, youwill not findmore
suitable fittings than the Siltek™ and Silcosteel®-
CR treated Swagelok® fittings listed on page 5.
If you already have the components of your sys-
tem, or need unusual parts, Siltek™, Silcosteel®-
CR, or other Restek surface treatments can be
applied to these parts on request. For informa-
tion, contact ourTechnical Service chemists or
your Restek representative.
Siltek™ andSilcosteel®-CRTreated
ElectropolishedStainless Steel Tubing
Restek also sets the highest standard of inert-
ness for transfer tubing for analytical and
process applications.The near-mirror finish
inside our electropolished tubing (surface
roughness of only 5-7micro-inches), in combina-
tionwith our unequalled surface treatments,
ensures superior inertness or greatly enhanced
corrosion resistance.We can provide continuous
coils of treated 1/8" tubing up to 100
feet/30.5m long, or coils of 1/4" tubing up to
300 feet/91.4m long; these lengths of treated
electropolished tubing are not available any-
where else.
Extremely inert, Siltek™ treated tubing is ideal in
systems used for transferring active sulfur-con-
taining compounds, for testing automotive
exhaust or sampling stack gas, for processmon-
itoring, or in any other application inwhich a
representative sample of chemically active com-
poundsmust be transferredwithout loss.
In systems used to transfer hydrochloric, nitric,
or sulfuric acid, or seawater, Silcosteel®-CR
treated electropolished stainless steel tubing
will last longer and require lessmaintenance
than untreated tubing.Table 1 and Figure 1
show Silcosteel®-CR treated stainless steel is
verywell protected from both pitting and
crevice corrosion, compared to untreated stain-
less steel.
Total Protection
Formaximum inertness, we recommend a sam-
ple transfer system constructed fromRestek
treated electropolished stainless steel tubing
and Restek
treated
Swagelok® fit-
tings.To find out
how these com-
ponents can
improve the reli-
ability of your
data, and/or
minimize costly,
time-consuming
maintenance, contact ourTechnical Service
Group (ext. 4), or your Restek representative,
and speakwith our surface treatment experts.
*Siltek™ treatment is themultiple-purpose equivalent to
Sulfinert® treatment, the surfacewe apply specifically to sys-
tems used to collect, store, and transfer active sulfur-contain-
ing compounds.
RestekSurface
TechnologyEarnsR&D
100Award
Our newest surface treatment,
Silcosteel®-UHV, has been
recognized by a panel of
independent judges and editors of R&D
Magazine as one of the 100most technologi-
cally significant products introduced in 2003.
Silcosteel®-UHV treatment minimizes the
migration of water and oxygenmolecules from
the surfaces of ultra high vacuum system com-
ponents into the vacuum chamber, allowing the
system to be evacuatedmuchmore quickly,
with less costly pumping equipment.
NewPublicationFeaturesRestek
SurfaceTechnology
Learnmore about our precisely applied, highly
durable surface treatments: request our new
38-page brochure today (lit. cat.# 59493),
or review it on our new Performance Coatings
Divisionwebsite:
www.restekcoatings.com
Figure1 Silcosteel®-CR treated316L stainless
steel coupons showno crevice corrosionand
only slight pitting corrosion; untreated coupons
exhibit severe crevice corrosion.
Table1 Silcosteel®-CR treated stainless steel
coupons show littleweight loss after exposure
to6%w/w ferric chloride solution.
Sample Weight Loss (g/m2)
Silcosteel®-CR 19
Silcosteel®-CR 25
Silcosteel®-CR 25
Bare Steel 231
Bare Steel 20
Bare Steel 228 Silcosteel®-CR treated untreated