HPLC COLUMNS
Kromasil® Columns
32
Phone: 800-356-1688 or 814-353-1300
Kromasil®C18Columns (USPL1)
average carbon load: 20%
also
available
For guard cartridges for these
columns, see page39.
• Perfectly spherical, totallyporousHPLC silicaproducts fromKromasil.
• Wide range of bondedphases andparticle sizes.
• Excellent chemical purity and stability, for highly efficient, reproducible separations.
Kromasil®HPLC silicaproducts consistof highly spherical,porousparticles in sizes from3.5µm to16µm
and larger. The surface properties of the silica have been optimized, and include a narrowpore size dis-
tribution and a well-defined pore structure. For chromatographic separations, these properties ensure
higher efficiencies, lower pressure drops, and excellent lot-to-lot reproducibility.
Kromasil® spherical silicas are produced using a sol-gel technique, which yields amechanically strong
particlewith a large surface area (330m
2
/g for 100Å silica).Metal impurities are carefullymonitored, as
tracemetals in the silica structure increase the surface acidity and can lead to tailing peaks for basic or
chelating compounds.Typicalmetal content forKromasil® silicas is shown inTable I.
Kromasil® bonded phases aremanufactured usingmonofunctional silanes, for higher surface coverage
and greater reproducibility. Bonding is followed by an end-capping procedure, which further increases
chemical stability.
Restek offers all Kromasil® phases, in a full range of column dimensions and silica particle sizes. A
samplingof ourproductoffering is shownhere.For further informationaboutKromasil®productsavail-
able fromRestek, please contact Restek technical service at 800-356-1688, ext. 4, 814-353-1300, ext. 4, or
Kromasil®ChromatographyProducts
Table I
Typical
chemical purity for
Kromasil® spherical
silicas.
Content
Metal
(ppm)
Na
<20
Al
<10
Fe
<10
Values based onAAS or ICP
measurements.
Kromasil®HPLCColumns
PhysicalCharacteristics:
particle size: 3.5µmor 5µm, spherical
pore size: 100Å
endcap: fully endcapped
pH range: 1.5 to10
Kromasil®C4Columns (USPL26)
average carbon load: 8%
2.1mm ID
3.2mm ID
4.6mm ID
Length
cat.#
price
cat.#
price
cat.#
price
5µmColumns
30mm
9202532
$273
9202533
$273
9202535
$273
50mm
9202552
$273
9202553
$273
9202555
$273
100mm
9202512
$298
9202513
$298
9202515
$298
150mm
9202562
$334
9202563
$334
9202565
$334
200mm
9202522
$344
9202523
$344
9202525
$344
250mm
9202572
$364
9202573
$364
9202575
$364
2.1mm ID
3.2mm ID
4.6mm ID
Length
cat.#
price
cat.#
price
cat.#
price
3.5µmColumns
30mm
9204332
$240
—
—
9204335
$240
50mm
9204352
$265
—
—
9204355
$265
100mm
9204312
$315
—
—
9204315
$315
150mm
9204362
$350
—
—
9204365
$350
5µmColumns
30mm
9204532
$273
9204533
$273
9204535
$273
50mm
9204552
$273
9204553
$273
9204555
$273
100mm
9204512
$298
9204513
$298
9204515
$298
150mm
9204562
$334
9204563
$334
9204565
$334
200mm
9204522
$344
9204523
$344
9204525
$344
250mm
9204572
$364
9204573
$364
9204575
$364
