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Figure 3 Silcosteel®-CR treated stainless
steel shows no sign of attack after 4000-
hour salt spray exposure, per ASTM B117.
• 17 • 2007 vol. 2
Restek Performance Coatings
Visit us at for:
• Siltek®/Sulfinert® treated and Silcosteel®-CR treated
Swagelok® and Parker fittings
• Siltek®/Sulfinert® treated and Silcosteel®-CR treated valves
• Siltek® treated in-line filters
• Sulfinert ® treated Swagelok® sample cylinders
• Sulfinert ® treated Alta-Robbins sample cylinder valves
• Additional treated stainless steel tubing
Siltek®/Sulfinert ® treated, electropolished, 316L grade
Siltek®/Sulfinert ® treated, 316L grade
Siltek®/Sulfinert ® treated, 304 grade
Silcosteel ®-CR treated, electropolished, 316L grade
Silcosteel ®-CR treated, 316L grade
Treat the entire sample pathway for maximum benefit.
Fittings
Connections can be a source of adsorption and sample loss, and there is ben-
efit to employing Restek surface treatment on many of these components. In
corrosive environments, Silcosteel®-CR treatment will extend the useful life of
system fittings, as well as tubing. We offer extensive lines of treated Swagelok®
and Parker fittings, in sizes from 1/16" to 3/8".
Valves
The sample flow path through a valve can prolong contact between the sam-
ple stream and the valve components. Restek surface treatments have been
applied to many valve geometries, to eliminate adsorption to bodies, stems,
diaphragms, or other components.
Filters
Frits and other filtering devices trap particles and prevent them from entering
the analytical instrument, but they also very effectively adsorb active compo-
nents in sample streams. Their large surface areas can increase sample/system
contact by orders of magnitude. Siltek ®/Sulfinert® treatment of frits and filters
creates an inert flowpath. Our chemical vapor deposition technology ensures
the treatment penetrates even the smallest pores in sintered metal frits.
Sample Vessel Equipment
Restek treated sampling containers prevent active components from adsorb-
ing to vessel, valve, or outage tube surfaces. We offer a complete line of high
pressure sampling equipment for applications involving liquefied petroleum
gases, ethylene, natural gas, or propylene.
Sampling Probes
An untreated probe contributes to the active surface area in the system, and
this should be considered when identifying potential adsorption sites during
active stream transfer.
Heated Transport Lines
Active compounds in the sample quickly can be adsorbed onto the hot tub-
ing in a heated “trace line”. Restek surface treatment prevents adsorption of
active compounds.
Summary
Surface treatments from the Restek Performance Coatings group prevent
adsorption of active compounds or corrosion in process systems, and always
should be considered in applications in which active or corrosive streams are
to be sampled, transferred, or analyzed.
Figure 2 Silcosteel®-CR resists pitting
and crevice corrosion when exposed to
ferric chloride, per ASTM G48, B.
Silcosteel®-CR treated untreated
0 50 100 150 200 250
Untreated 316 SS
Silcosteel ®-CR
weight loss in grams per square meter
Silcosteel®-CR treated untreated
Figure 4 Silcosteel®-CR demonstrates sig-
nificant cost savings, compared to untreated
stainless steel or alloys (US dollars).
$600,000
$400,000
$200,000
0
untreated
stainless
steel
Silcosteel®-CR high
performance
alloy
get more info
rust
Siltek®/Sulfinert® Treated Coiled 316L Grade Stainless Steel Tubing
*0.020" wall thickness **0.035" wall thickness ***0.049" wall thickness
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 $19.40/ft. $15.50/ft. $12.90/ft. $10.40/ft.
0.180" (4.57mm) 1 /4 " (6.35mm)** 22509 $19.40/ft. $15.50/ft. $12.90/ft. $10.40/ft.
0.277" (7.04mm) 3/8" (9.52mm)*** 22914 $18.75/ft. $15/ft. $12.50/ft. $10/ft.
Silcosteel®-CR Treated Coiled 316L Grade Stainless Steel Tubing
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 $19.40/ft. $15.50/ft. $12.90/ft. $10.40/ft.
0.180” (4.57mm) 1 /4 ” (6.35mm)** 22897 $19.40/ft. $15.50/ft. $12.90/ft. $10.40/ft.
0.277” (7.04mm) 3/8” (9.52mm)*** 22915 $18.75/ft. $15/ft. $12.50/ft. $10/ft.
Price-per-foot
ID OD cat.# 5-24 ft. 25-99 ft. 100-299 ft. >300 ft.
0.085" (2.16mm) 1/8 " (3.18mm)* 22538 $25.90/ft. $20.70/ft. $17.40/ft. $14.50/ft.
0.180" (4.57mm) 1/4" (6.35mm)** 22539 $25.90/ft. $20.70/ft. $17.40/ft. $14.50/ft.
Siltek®/Sulfinert® Treated Coiled Electropolished
316L Grade Stainless Steel Tubing