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• 4 • 800-356-1688 • 2004 vol. 3
Siltek ™ and Silcosteel®-CR Treated Fittings
and Tubing for Demanding Applications
by Gary Barone, Restek Performance Coatings Division
•Siltek™ treatment for exceptional inertness.
•Silcosteel®-CR treatment for protection from acids or seawater.
• Treated surfaces will not chip, flake, or delaminate.
•Custom treatment available.
Siltek™ and Silcosteel®-CR Treated
Swagelok® Fittings
Swagelok® fittings are world-renowned for
meeting demanding standards. Now, a wide
selection of Swagelok® products, available from
stock with 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.* The most 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
the most stressful applications.
Silcosteel®-CR treatment is highly effective pro-
tection for stainless steel exposed to hydrochlo-
ric acid, nitric acid, or sulfuric acid, or to marine
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, you will not find more
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 our Technical Service chemists or
your Restek representative.
Siltek™ and Silcosteel® -CR Treated
Electropolished Stainless 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 5-7 micro-inches), in combina-
tion with 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 process mon-
itoring, or in any other application in which a
representative sample of chemically active com-
pounds must be transferred without 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 less maintenance
than untreated tubing. Table 1 and Figure 1
show Silcosteel®-CR treated stainless steel is
very well protected from both pitting and
crevice corrosion, compared to untreated stain-
less steel.
Total Protection
For maximum inertness, we recommend a sam-
ple transfer system constructed from Restek
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 our Technical Service
Group (ext. 4), or your Restek representative,
and speak with our surface treatment experts.
*Siltek™ treatment is the multiple-purpose equivalent to
Sulfinert® treatment, the surface we apply specifically to sys-
tems used to collect, store, and transfer active sulfur-contain-
ing compounds.
Restek Surface
Technology Earns R&D
100 Award
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 100 most technologi-
cally significant products introduced in 2003.
Silcosteel®-UHV treatment minimizes the
migration of water and oxygen molecules from
the surfaces of ultra high vacuum system com-
ponents into the vacuum chamber, allowing the
system to be evacuated much more quickly,
with less costly pumping equipment.
New Publication Features Restek
Surface Technology
Learn more 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
Division website:
Figure 1 Silcosteel®-CR treated 316L stainless
steel coupons show no crevice corrosion and
only slight pitting corrosion; untreated coupons
exhibit severe crevice corrosion.
Table 1 Silcosteel®-CR treated stainless steel
coupons show little weight loss after exposure
to 6% 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