RestekCorporation
(800) 356-1688
CapillaryColumns
TheNewRtx
®
-WaxColumn
note
A
pplications
cat.#59571
Restek’snewRtx
®
-Wax columnhas:
• a20°Cminimumoperating
temperature.
• thermal stabilitywithguaranteed
lowbleed to250°C.
• the capability to resolvexylene
isomers forBTEX analysis.
• excellent inertness for aldehyde
analysis.
Restek’sRtx
®
-Wax columns aremade
with anewCrossbond
®
polyethylene
glycol (PEG) stationaryphase.This new
innovation inpolymer technologyhas
produced themost inert and efficient
PEGcolumns currentlyavailable. The
extendedoperating temperature range
allows the analysis of compoundswith
awide volatility range,while the
Crossbond
®
technologyensures low
bleed at temperatures as high as 250°C.
* Selectivity data available upon request.
The selectivityof theRtx
®
-Wax is
comparable toother bondedCarbowax
®
columns*, yieldingexcellent resolution
of compounds ranging from intermedi-
ate tohighpolarity. This exceptional
inertness andefficiencyallowsversatil-
ity indifficult analyses such as isomeric
separations, aldehydes, and alcohols.
ReducedMinimumOperating
Temperature
ManyPEG columns undergo a solid-
liquidphase transition at temperatures
below40°C that results in a loss of
efficiency, reduced samplecapacity, and
poor retention time reproducibility
1
.The
newRtx
®
-Waxcolumncaneffectively
operate at 20°Cwithout displaying any
adverse effects. This is especially
advantageous forapplications involving
purge& trap andheadspace analyses
wherevolatile componentsmust be
cold-trappedonto the column. Figures 1
and2demonstrate thedifference in
PEG columnperformance at 20°C.
Figure 1
is a chromatogramof eight
volatile components on theRtx
®
-Wax
column.
Figure 2
(on thenext page)
shows the same analysis and conditions
on aStabilwax
®
column.TheRtx
®
-Wax
columnprovidesbetter column
efficiency and resolutionof the analytes
demonstrating its superior suitability for
low temperatureanalyses.
1. acetaldehyde
2. acetone
3. ethyl formate
4. ethyl acetate
5. methanol
6. ethanol
7. n-propanol
8. isobutanol
TheRtx
®
-Waxmaintains column efficiencyat 20°Callowing separationof volatile components.
c-gram #5031
30m, 0.53mm ID, 1.0µmRtx-Wax (cat.# 12455). 0.1µl split injection of volatile solvents.
Oven temp.:
20°C (hold 10min.) to 100°C@ 5°C/min.;
Inj./det. temp.:
200°C;
Carrier gas:
helium;
Linear velocity:
40cm/sec. set@ 20°C;
FID sensitivity:
8 x 10
-11
AFS;
Split ratio:
10:1
Figure 1
Questions?
Call our technical
service staff at
800-356-1688, ext. 4
min. 5
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