ADV01-05_1-298

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www.restekcorp.com

800-356-1688

The rugged Silcosteel

tubing will hold up indefi-

nitely to temperatures in excess of 430°C, so col-

umn lifetime is not limited by the tubing. To

demonstrate the utility of this innovative product,

we analyzed Polywax

1000 using the MXT

-1HT

Sim Dist column (Figure 2). Notice the excellent

peak shape of hydrocarbons up to C110.

To maintain the low bleed and high performance of

the MXT

-1HT Sim Dist column, it is critical to pre-

vent oxygen from entering the column. This can be

achieved by electronically leak checking your entire

system. We also recommend the use of graphite fer-

rules; Vespel

or Vespel

/graphite ferrules are

more likely to loosen over time.

The MXT

-1HT Sim Dist column is available in a

5m, 0.53mm ID, 0.1µm film to conform to the

requirements of ASTM Method D-6352. It exceeds

the criteria for resolution, peak shape, and bleed

for hydrocarbons ranging up to C110.

columns are manufactured using polyimide-coated

fused silica tubing. At temperatures above 380°C,

even the best polyimide coating becomes brittle,

which leads to very short column lifetimes. In addi-

tion, the methyl silicone stationary phase recom-

mended in the method also must survive these high

temperatures.

Extensive research by scientists at Restek has led to

a major improvement in columns for high-tempera-

ture simulated distillation. By combining a new

proprietary polymer synthesis technology, Siltek

™

deactivation chemistry, and rugged Silcosteel

tub-

ing, we developed a capillary column that meets all

the criteria of ASTM Method D-6352. Because the

MXT

-1HT Sim Dist column is coated with a 100%

dimethyl polysiloxane polymer, it will give the cor-

rect retention time/boiling point curve. The MXT

1HT Sim Dist column exhibits low bleed at 430°C

and excellent peak shape due to the unique poly-

mer synthesis and Siltek

™

deactivation (Figure 1).

MXT

-1HT SimDist

(metal column)

Length (m)

ID (mm)

df(µm)

Temp. Limits

cat.#

0.53

0.10

-60 to 430°C

Please note:

For high-temperature analyses such as simulated distillation,

Restek strongly recommends the use of the following accessories to ensure low

bleed and maintain high performance.

Capillary Graphite Ferrules

For

" compression-type fittings

Ferrule ID (mm)

Fits Column ID (mm)

10-pack

50-pack

0.8

0.53

For Agilent GCs (compact ferrules)

Ferrule ID (mm)

Fits Column ID (mm)

10-pack

50-pack

0.8

0.53

For M4 fittings for QCQ ThermoQuest 8000 & Trace GCs

Ferrule ID (mm)

Fits Column ID (mm)

2-pack

10-pack

0.8

0.53

Standard Graphite Ferrules

For

" fittings

Fitting Size (")

Ferrule ID (")

10-pack

D6352-98 Polywax

Standards

These high molecular weight hydrocarbon

waxes are useful for simulated distillation

and other high-temperature GC work.

Ea.

cat.#

qty.

Polywax 500

36224

1 gram

Polywax 655

36225

1 gram

Polywax 850

36226

1 gram

Polywax 1000

36227

1 gram

Triple Filter: Removes xygen/moisture and hydrocarbon impurities. cat.# 22020, (ea.) $130

Single-Position Baseplate:

Ultra-High Capacity Oxygen Filter:

Leak Detective

™

Electronic Leak Detector

• Compact, lightweight, hand-held design.

• Lowest-cost thermal conductivity leak detector available.

• Contamination-free leak detection.

• Detects helium or hydrogen trace leaks at 3 x 10

-4

cc/sec. or 200ppm.

• Audible alarm and LED readout.

• Responds in less than 2 seconds to trace leaks of gases.*

• Operates on two 9-volt batteries or AC adaptor, both included.

*Not designed for use in explosive atmospheres.

Many GC problems can be avoided by

electronic leak checking the system dur-

ing the plumbing process. Thorough leak

checking will prevent loss of GC gases,

damage to capillary columns, and

increased detector maintenance. Oxygen

can move into the system via a leak due

to the Venturi effect, and irreversible

damage can occur if a column is exposed

to oxygen at high temperatures, such as

those needed for simulated distillation.

Also, some detectors are very sensitive to

oxygen. Leak checking the instrument

before column installation and condition-

ing prevents column degradations indicat-

ed by high bleed and short lifetimes. Leak

checking should be performed on the

entire gas system and GC. Begin by

checking all fittings inside the GC. Next

check the external fittings along the carri-

er gas lines, all the way to the tanks.

Never use liquid leak detectors that con-

tain soap or surfactants because liquids

can be drawn inside the fitting at the site

of the leak and contaminate the system.

Hot Tech Tip

Super-Clean

™

SGT Gas Filters

• High-purity output (99.9999% purity).

• Features a “quick connect” for fast and simple cartridge

changes.

• Full glass/metal design with easy-to-read indicators.

70100

20224

20202

20252

20284

20285

20253

20210

European 2-prong plug (220 VAC):

cat.# 21382 (ea.)

(110 VAC):

cat.# 21607, (ea.)

cat.# 22029, (ea.)

cat.# 22025, (ea.)

(220 VAC):

cat.# 21609, (ea.)