min. 20 24 28 32 36 40 44 48 52 56 60 64 68
Carborane Dimethyl Polysiloxane
ProductListing
distribution forpetroleum samplescontainingaromatichydrocar-
bons.TheMXT
®
-500SimDist stationaryphasehas increased
relative retentionof aromatichydrocarbonscompared to the
methyl siliconeMXT
®
-1SimDist stationaryphase. This causes
thecalculatedboilingpointsof aromatics tobe slightlyhigher
using theMXT
®
-500SimDist phase, although they are closer to
the true value (seeTable I).
Whilebothcolumns canbeoperated to430°C, theMXT
®
-500
SimDist columnhas lowerbleedand longer lifetime.TheMXT
®
-1
SimDist columnoffersmethyl siliconepolarity thatmatches
publisheddata.
High-temperatureGCanalyses challenge the limitsof existing
tubingand stationaryphase technology.Restek’sMXT
®
tubing is
ideally suited to the taskwhencompared to fused silicaor
aluminumclad tubing.Thehigh temperaturesnecessary for
simulateddistillationanalyses alsopushGCpolymers to the limit
of thermal stability.TheMXT
®
-500andMXT
®
-1SimDist
columnsareprovenperformersunder theseextremeconditions.
Whenproperlyconditioned to430°C, thesecolumnsgive stable
baselines, lowbleed, and repeatable retention times for simulated
distillationandother high-temperatureGCanalyses.
Figure 2
MXT
®
-500 SimDist Polymer—designed by incorporating
carborane into the backbone of themethyl silicone polymer
chain topromote thermal stability.
Figure 3
MXT
®
-500SimDist Column is anExcellent Choice for LowerBleedandExtendedLifetime.
6m, 0.53mm ID, 0.15µmMXT
®
-500 SimDist (cat.# 70104).
1.0µL injection of Polywax
®
655 in CS
2
, cold on-column.
Oven temp.:
40°C to 430°C@ 6°C/min.;
Det. temp.:
430°C;
FID sensitivity:
2.5 x 10
-10
AFS;
Carrier gas:
hydrogen;
Linear velocity:
45cm/sec. set @ 40°C.
Dimethyl Polysiloxane
Table I
Differences in theCalculatedBoilingPoints ofAromatics
Using theMXT
®
-500SimDist Phase.
Compound
Boiling Point
MXT
®
-1
MXT
®
-500
°C (°F)
∆
°C (°F)
∆
°C (°F)
toluene
128 (231)
-1 (-2)
8 (14)
p-xylene
157 (282)
-2 (-3)
4 (8)
naphthalene
236 (424)
-19 (-34)
-4 (-8)
acenaphthene
297 (534)
-28 (-51)
-11 (-19)
chrysene
465 (837)
-74 (-134)
-48 (-87)
coronene
543 (977)
-59 (-106)
-23 (-42)
Restek Trademarks:
MXT, Silcosteel.
Other Trademarks:
Polywax (Petrolite Specialty Polymers Group).
Description
Cat.#
MXT
®
-1 SimDist (6m, 0.53mm ID, 0.15µm)
70101
MXT
®
-500 SimDist (6m, 0.53mm ID, 0.15µm)
70104
Description
Cat.#
Polywax
®
Standard (655CalibrationMaterial, 1g)
36225
