• 10 •
800-356-1688
Swagelok
®
fittings areworld-renowned formeeting
demanding standards. Now, Restek is pleased to set
the new standard for inert or corrosion-resistant
tubing system components: Swagelok
®
products with
Restek's unparalleled surface treatments—Siltek
™
or Silcosteel
®
-CR treatment—available from stock.
Siltek
™
treatment, which is equivalent to Sulfinert
®
treatment, is the ideal choice for ultimate inertness,
intended specifically for systems used to collect,
store, and transfer active compounds. Themost
reactive sample components can be stored and
transferred via a Siltek
™
treated system: even at
parts-per-billion levels, sulfur-containing or other
very active compounds exhibit virtually no adsorp-
tion. And, unlike coatings, Siltek
™
and other Restek
treatments produce a layer that is integral with the
fitting surface—it will not chip, flake, or delaminate,
even in themost stressful applications.
Silcosteel
®
-CR treatment is highly effective protection
for stainless steel exposed to hydrochloric, nitric, or
sulfuric acid, or tomarine environments. In inde-
pendent tests, Silcosteel
®
-CR treatment upgraded the
corrosion resistance of 300-grade stainless steel
samples by an order of magnitude (Table 1) and
totally protected them against crevice corrosion
(Figure 1).
Inert, High-Quality Fittings
and Tubing for
Demanding Applications
by Gary Barone, Restek Performance Coatings Division
Siltek™/Sulfinert®andSilcosteel®-CRTreatedSwagelok®Fittings
✔
Siltek
™
/Sulfinert
®
treatment* ensures ultimate inertness.
✔
Silcosteel
®
-CR treatment enhances acid resistance tenfold, ormore.
✔
Restek treatments cannot chip, flake, or delaminate.
✔
Custom treatment available.
Fitting Type
Similar to
Siltek
™
/Sulfinert
®
Silcosteel
®
-CR
Size
Swagelok
®
# qty.
cat.# price qty.
cat.# price
Union
1
/
16
"
SS-100-6
ea.
22540
ea.
22575
1
/
8
"
SS-200-6
ea.
22541
ea.
22576
1
/
4
"
SS-400-6
ea.
22542
ea.
22577
Tee
1
/
16
"
SS-100-3
ea.
22543
ea.
22578
1
/
8
"
SS-200-3
ea.
22544
ea.
22579
1
/
4
"
SS-400-3
ea.
22545
ea.
22580
ReducingUnion
1
/
8
" to
1
/
16
"
SS-200-6-1
ea.
22546
ea.
22581
1
/
4
" to
1
/
16
"
SS-400-6-1
ea.
22547
ea.
22582
1
/
4
" to
1
/
8
"
SS-400-6-2
ea.
22548
ea.
22583
Union Elbow
1
/
8
"
SS-200-9
ea.
22549
ea.
22584
1
/
4
"
SS-400-9
ea.
22550
ea.
22585
Plug
1
/
16
"
SS-100-P
ea.
22572
ea.
22619
1
/
8
"
SS-200-P
ea.
22573
ea.
22620
1
/
4
"
SS-400-P
ea.
22574
ea.
22597
Cross
1
/
8
"
SS-200-4
ea.
22551
ea.
22586
1
/
4
"
SS-400-4
ea.
22552
ea.
22587
Tube End Reducer
1
/
8
" tube to
1
/
16
"
SS-100-R-2
ea.
22553
ea.
22588
1
/
4
" tube to
1
/
16
"
SS-100-R-4
ea.
22554
ea.
22589
1
/
8
" tube to
1
/
4
"
SS-400-R-2
ea.
22555
ea.
22590
1
/
4
" tube to
1
/
8
"
SS-200-R-4
ea.
22556
ea.
22591
Port Connector
1
/
8
"
SS-201-PC
ea.
22557
ea.
22592
1
/
4
"
SS-401-PC
ea.
22558
ea.
22593
1
/
8
" tube to
1
/
4
"
SS-401-PC-2
ea.
22559
ea.
22594
Male Connector
1
/
8
" to
1
/
8
" NPT
SS-200-1-2
ea.
22561
ea.
22595
1
/
4
" to
1
/
4
" NPT
SS-400-1-4
ea.
22562
ea.
22596
1
/
16
" to
1
/
8
" NPT
SS-100-1-2
ea.
22563
ea.
22610
1
/
8
" to
1
/
4
" NPT
SS-200-1-4
ea.
22564
ea.
22611
1
/
4
" to
1
/
8
" NPT
SS-400-1-2
ea.
22565
ea.
22612
Female Connector
1
/
8
" to
1
/
8
" NPT
SS-200-7-2
ea.
22566
ea.
22613
1
/
4
" to
1
/
4
" NPT
SS-400-7-4
ea.
22567
ea.
22614
1
/
4
" to
1
/
8
" NPT
SS-400-7-2
ea.
22568
ea.
22615
1
/
8
" to
1
/
4
" NPT
SS-200-7-4
ea.
22569
ea.
22616
BulkheadUnion
1
/
8
"
SS-200-61
ea.
22570
ea.
22617
1
/
4
"
SS-400-61
ea.
22571
ea.
22618
Figure1
Silcosteel®-CR treated316L stainless
steel coupons showno crevice corrosionand
only slight pitting corrosion (top),whilebare
316L stainless steel coupons exhibit severe
crevice corrosion (bottom).
Table1
Silcosteel®-CR treated stainless steel
coupons show littleweight loss after exposure to
6%w/w ferric chloride solution.
Sample
Weight Loss (g/m
2
)
Silcosteel
®
-CR 17
19
Silcosteel
®
-CR 28
25
Silcosteel
®
-CR 47
25
Bare Steel 27
231
Bare Steel 34
209
Bare Steel 37
228
If you need to construct a system for a demanding
application, youwill not findmore suitable fittings
thanRestek treated Swagelok
®
fittings. Siltek
™
,
Silcosteel
®
-CR, or other Restek surface treatments
can be applied to other fittings or parts on
request—contact our Technical Service chemists or
your Restek representative.
