After the tubingwas stabilizedwith 1ppm of
moisture, dry-down propertiesweremeasured.
Moisture dry-down curves for the three tubing
treatments show treated electropolished tubing
achieved dry-down in 35minutes, electropol-
ished tubing required 65minutes, and standard
tubing required 175minutes (Figure 2).Table 1
compares time to various dry-down levels for
tubing saturatedwith 10ppm of moisture.
In addition to rapidwet-up and dry-down, the
other key advantage of Restek treatment for
316L stainless steel is a dramatic improvement
in corrosion resistance.The amorphous silicon
layer is insoluble inmany of the acidic environ-
ments encountered in the semiconductor indus-
try. Figures 3, 4, and 5 briefly summarize the
results of corrosion testing by ASTMmethods.
Comparisons between treated and untreated
test samples illustrate the improvements in
corrosion resistance offered by Silcosteel
®
-CR
treatment. Formore information about
corrosion resistance, request information
packet 59048., or visit our website.
Whenmoisture considerations and corrosion
concerns arise in transfer of ultra-high purity
gas streams, Restek treated tubing and system
componentswill dramatically improve dry-down,
reduce contamination frommoisture carryover,
and extend periodicmaintenance cycles.
Figure4
Silcosteel®-CR treated316L stainless
steel coupons showno signof attackafter
4000-hour salt sprayexposure, perASTMB117.
Silcosteel®-CR treated
untreated
Siltek®-andSilcosteel
®
-CR-Treated
ElectropolishedTubing
• Exceptional inertness.
• Improved reliability and reproducibility; longer
lifetime.
• Usewith treated fittings for themost inert sample
pathway available.
Price-per-foot
ID
OD
cat.#
5-24 ft.
25-199 ft.
200-399 ft.
>400 ft.
0.055" (1.40mm)
1
/
8
" (3.18mm)**
22896
0.180" (4.57mm)
1
/
4
" (6.35mm)**
22897
We offer awide variety of
treated fittings
and custom treatment.
For information and
ordering, call us or
visit us online.
110Benner Circle • Bellefonte, PA 16823
800-356-1688•814-353-1300• fax: 814-353-1309
Restek
Performance
Coatings
Lit. Cat.#580001
© 2005 Restek Corporation.
free
literature
Learnmore about our precisely applied, highly
durable surface treatments: request our
brochure lit. cat.# 59493.
Restek trademarks:
Silcosteel, Siltek, the RPC
logo. Other trademarks:
TrueTube (O'Brien Corp.)
*
1
/
8
" OD: 5 ft. to 100 ft. in one continuous coil;
1
/
4
" OD: 5 ft. to 300 ft. in one continuous coil. Longer lengthswill bemore than one coil.
**0.035" wall thickness
Figure3 In chlorideenvironments,
Silcosteel®-CR treated stainless steel
outperformsuntreatedmetal byanorder of
magnitude (ASTMG48,MethodB).
Figure5
Silcosteel®-CR treated316L stainless
steel coupons showno crevice corrosionand
only slight pitting corrosionafter 72-hour
exposure to ferric chloride; untreated coupons
exhibit severe crevice corrosion.
Silcosteel®-CR treated
untreated
0
50
100
150 200 250
Untreated 316 SS
Silcosteel
®
-CR
weight loss in grams per squaremeter
Reference
1.
Relative Response Time of True Tube
™
whenMeasuring
Moisture Content in a Sample Stream
Test Report, Haritec
Scientific & Engineering Support, Calgary, Alberta, Canada,
May 2004.
Reference courtesy of O'Brien Corporation, available on
request fromRestek.
Price-per-foot
ID
OD
cat.#
5-24 ft.
25-99 ft.
100-299 ft.
>300 ft.
0.085"
1
/
8
"
22538
0.180"
1
/
4
"
22539
Price-per-foot
ID
OD
cat.#
5-24 ft.
25-99 ft.
100-299 ft.
>300 ft.
0.085"
1
/
8
"
22536
0.180"
1
/
4
"
22537
Siltek®-TreatedElectropolishedTubing
Silcosteel®-CR-TreatedElectropolishedTubing
CoiledSiltek®-andSilcosteel®-CR-TreatedSeamless316LGrade
StainlessSteelTubing
Price-per-foot
ID
OD
cat.#
5-24 ft.
25-199 ft.
200-399 ft.
>400 ft.
0.055" (1.40mm)
1
/
8
" (3.18mm)**
22508
0.180" (4.57mm)
1
/
4
" (6.35mm)**
22509
Siltek®-Treated316LTubing
Silcosteel®-CRTreated316LTubing
