•
15
•
800-356-1688 •
2005vol. 3
treated electropolished, electropolished, and standard tubingare compared in
Figure 1. Treated electropolished tubing reached the 98% saturation limit in
30minutes,compared to60minutes forelectropolished tubing.Standard tub-
ing couldonly achieve a 96%uptake, after 180minutes.
After the tubingwas stabilizedwith 1ppm of moisture, dry-down properties
were measured. Moisture dry-down curves for the three tubing treatments
show treated electropolished tubing achieved dry-down in 35minutes, elec-
tropolished tubing required 65 minutes, and standard tubing required 175
minutes (Figure2).Table1compares time tovariousdry-down levels for tub-
ing saturatedwith10ppmofmoisture.
SuperiorCorrosionResistance:Silcosteel®-CR
In addition to rapidwet-up anddry-down, theother key advantageof Restek
treatment for 316L stainless steel is a dramatic improvement in corrosion
resistance. The amorphous silicon layer is insoluble inmany acidic environ-
ments.Figures3,4, and5briefly summarize the resultsof corrosion testingby
ASTMmethods. Comparisons between treated and untreated test samples
illustrate the improvements in corrosion resistance offered by Silcosteel®-CR
treatment. For more information about corrosion resistance, request infor-
mationpacket 59048, or visit ourwebsite.
When moisture considerations and corrosion concerns arise in transfer of
ultra-high purity gas streams, Restek treated tubing and system components
will dramatically improve dry-down, reduce contamination frommoisture
carryover, and extendperiodicmaintenance cycles.
Reference
1.
Relative Response Time of True Tube
™
whenMeasuringMoisture Content in a Sample Stream
Test Report,
Haritec Scientific & Engineering Support, Calgary, Alberta, Canada, May 2004.
Tubing used in thewet-up / dry-down experimentswas supplied by Cardinal UHP (St. Louis, MO). All tubingwas
tested as 100 foot coils of
1
/
4
" OD x 0.020" wall 316L stainless steel. Electropolished tubing had a surface rough-
ness of 10 to 15microinches. Siltek
®
treated tubingwas finishedwith 5µm of amorphous silicon, followed by a
surface functionalization to increase inertness and hydrophobicity.
Reference courtesy of O’Brien Corporation, available on request fromRestek.
Silcosteel®-CR treated
untreated
Silcosteel®-CR treated
untreated
Figure4
Silcosteel®-CR treated316L
stainless steel showsno signof attackafter
4000-hour salt sprayexposure (ASTMB117).
Figure5
Silcosteel®-CR treated316L
stainless steel showsno crevice corrosion
andonly slight pitting corrosionafter 72-
hour exposure to ferric chloride; untreated
steel exhibits severe crevice corrosion.
Siltek
®
Treated 316L Tubing**
Silcosteel
®
-CR -Treated 316L Tubing**
Silcosteel
®
-CR-Treated Electropolished Tubing
Siltek
®
-Treated Electropolished Tubing
Siltek®-andSilcosteel®-CR-TreatedElectropolishedTubing
• Exceptional inertness.
• Improved reliability and reproducibility; longer lifetime.
• Usewith treated fittings for themost inert sample pathway available.
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
Note: (required length inmeters) x (3.2808)= length in feet.
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
0.055" (1.40mm)
1
/
8
" (3.18mm)
22508
0.180" (4.57mm)
1
/
4
" (6.35mm)
22509
0.085"
1
/
8
"
22536
0.180"
1
/
4
"
22537
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
Coiled,Treated,Seamless316GradeStainlessSteelTubing
Figure3
In chlorideenvironments,
Silcosteel®-CR treated stainless steel
outperformsuntreatedmetal byanorder
ofmagnitude (ASTMG48,MethodB).
0
50
100
150 200 250
Untreated 316 SS
Silcosteel
®
-CR
weight loss in grams per squaremeter
for
more
info
Learnmore about our precisely applied,
highly durable surface treatments:
