2
4
6
8
10 12
min.
14 16 18 20 22
Rtx
®
-5/MXT
®
-5
Capillary Columns
5% diphenyl/95% dimethyl polysiloxane
At-a-Glance
Product
Information
fromRestek
800-356-1688
814-353-1300
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What is theRtx
®
/MXT
®
-5?
ThenonpolarRtx
®
andMXT
®
-5columns are
fused silica and Silcosteel
®
-lined stainless
steel (respectively) capillary columns coated
with a 5% diphenyl/95% dimethyl polysi-
loxane stationary phase.
Why use a 5% diphenyl/95% dimethyl
polysiloxanephase?
TheRtx
®
/MXT
®
-5 column is themost popu-
lar and versatile capillary stationary phase
available. The diphenyl groups impart a se-
lectivity towards aromatic compounds.Rtx
®
/
MXT
®
-5 columns are extremely rugged, ex-
hibiting longcolumn lifetime, lowbleed, and
highmaximum operating temperatures.
Which applications work well using an
Rtx
®
/MXT
®
-5 column?
A5% diphenyl phase is extremely versatile,
permitting the analysis of nonpolar to polar
compounds, andacidic tobasic species, all in
a single analysis. An Rtx
®
/MXT
®
-5 column
is ideal for environmental analyses, such as
semivolatile pollutants, phenols, polynuclear
aromatichydrocarbons,pesticides,herbicides,
and diesel range organics (DRO). The Rtx
®
/
MXT
®
-5 column exhibits excellent inertness
towards highly reactive, trace environmental
compounds andhas low columnbleed to im-
prove detection limits and instrument sensi-
tivity. The phase also is ideal for drugs of
abuse and flavor analyses.
30m, 0.53mm ID, 5.0µmRtx
®
-5 (cat.#10279). 1mLheadspace injectionof 24 common residual solvents
for pharmaceutical processing. Prepared to equal about 500ppm in the bulkpharmaceutical. Samples
shaken andheated at 90°C for 15minutes.
Oven temp.:
35°C (hold10min.) to100°C@5°C/min., to
240°C@25°C/min. (hold5min.);
Inj./det. temp.:
220°C/240°C;
FID sensitivity:
1.05x10
-11
AFS;
Carrier gas:
helium, 35cm/sec. set@35°C;
Split ratio:
2:1.
Vacuum Vu-Union
®
1. methanol
2. ethylene oxide
3. ethanol
4. acetonitrile
5. acetone
6. isopropanol
7. diethyl ether
8. 1,1-dichloroethene
9. methylene chloride
10.
n
-propanol
11. methyl ethyl ketone
12.
n
-hexane
TheRtx
®
-5 phase is extremely versatile and can be used for awide
range of applications, such as organic volatile impurities in
residual solvents.
See ourChromatographyProducts catalogor visit
to
see additional application chromatograms on theRtx
®
/MXT
®
-5 columns!
13. ethyl acetate
14. chloroform
15. tetrahydrofuran
16. 1,1,1-trichloroethane
17. 1,2-dichloroethane
18. benzene
19. carbon tetrachloride
20.
n
-butanol
21. heptane
22. trichloroethylene
23. 1,4-dioxane
24. pyridine
25. toluene
1 2
3
4,5,6
22
24
7
8
9
10
23
13
14
11,12
16
15
17
19,20
21
25
Feature
Benefit
Fused silica&MXT
®
tubing
Low-bleed
Application SpecificColumns
Rtx
®
-5MS
Rtx
®
-5SilMS
Rtx
®
-5Amine
Integra-Guard
™
columns
Tubingmaterial versatility—same price
regardless of tubing.
Increased detector sensitivity, reduced
systemmaintenance.
Low-bleed to improveGC/MS detection
limits and reduce interferencewith trace
analyte identification and detection.
Optimized low-bleedGC/MS column for
semivolatile pollutants.
Basic deactivation layer provides highest
degree of inertness for primary amines and
basic compounds.
Leak-free connection, protects column from
non-volatile sample residue, longer column
lifetime.
Features&Benefits
