Economical solutions for
ultra-high purity streams
r
treated surfaces
improvemoisturewet-upor dry
downperformanceby up to 3x
compared to conventional
surfaces.
r
improves corrosion
resistance tenfold, ormore –
increases component lifetime and
maintains pureproduct stream.
r
Custom services:
canbe applied
to existing equipment.
Formore information about
SilcoNert andSilcolloy, visit us online
at
or call us! 814-353-1778.
®
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Improve Moisture Dry-Down and
Corrosion Resistance with SilcoTek
®
SilcoNert
®
2000(Siltek
®
/Sulfinert
®
) treated tubing and
system components offer improved analytical reliability
and longer lifetimes.
Introduction
Gas transfer systems serving industry
often require lowmoisture content
and high resistance to corrosion.
SilcoTek
®
coatings provide signi#cant
added value toconventional stainless
steel substrates, bygreatly reducing
wet-up and dry-down times and
dramatically improving corrosion
resistance.
SilcoNert
®
2000 is an amorphous
silicon layer depositedonto, and into,
the steel surface through apatented
chemical vapor deposition (CVD)
process. TheSilcoNert
®
2000process
(USPatent #6,444,326), has been
optimized to reducemoisture hold-up
and improve surface inertness.
Data for wet-up and dry-down
experiments,measuring the relative
response time formoisture content
change inSilcoNert 2000 treated elec-
tropolished stainless steel tubing, un-
treated electropolished stainless steel
tubing, and standard316L stainless
steel tubing, demonstrate a signi#cant
advantage in treated versus untreated
substrates.
1
Tubingused in thewet-up
/ dry-down experimentswas supplied
byCardinal 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 roughness of 10 to 15micro-
inches. SilcoNert 2000 treated tubing
is #nishedwith up to 0.5µm
of amorphous silicon, followedby
a surface functionalization that
increases inertnessandhydrophobicity.
Wet-up curves for SilcoNert 2000
treated electropolished, conventional
electropolished, and standard tub-
ing are compared inFigure 1. Treated
electropolished tubing reached the
98% saturation limit in 30minutes,
compared to60minutes for electrop-
olished tubing. Standard tubing could
only achieve a 96% uptake, after 180
minutes.
After the tubingwas stabilizedwith
1ppmofmoisture, dry-downproper-
tiesweremeasured.Moisturedry-
down curves for the three tubing
treatments show treated electropo-
lished tubing achieveddry-down in
35minutes, electropolished tubing
required 65minutes, and standard
tubing required 175minutes (Figure
2). Table 1 compares time to various
dry-down levels for tubing saturated
with 10ppmofmoisture.
Commercial 316LStainlessSteel
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
20
0
40
60
80
100
120
140
160
180
0.1
Electropolished 316LStainlessSteel
SilcoNert
®
2000-TreatedElectropolished316LStainlessSteel
Time (minutes)
Cout/Cin
Commercial 316LStainlessSteel
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
20
0
40
60
80
100
120
140
160
180
0.1
0.0
Electropolished 316LStainlessSteel
SilcoNert
®
2000-TreatedElectropolished 316LStainlessSteel
Time (minutes)
Cout/Cin
Figure1
SilcoTek treated electropolished
tubing stabilizes at 1ppmmoisturemuch faster
than conventional surfaces.
1
Figure 2
SilcoTek treated electropolished
tubingdriesmuch faster than
conventional surfaces.
1
Table I
SilcoTek
treated electropolished tubingprovides the shortest drying times.
1
TimeRequired toDetect Change (min.)
Moisture
SilcoNert2000Treated
Untreated
Concentration
Electropolished
Electropolished
Standard
From To
Tubing
Tubing
Tubing
10ppm*
5ppm
4
5
13
5ppm
1ppm
22
46
71
1ppm
500ppb
40
63
96
500ppb
100ppb
80
103
153
100ppb
50ppb
98
121
---
*Initial moisture concentration.
Applications Note
®
®
Lit Cat #ST008
2/28
39
