Chromatography Products from Nacalai Tesque and Alltech distributed by Timtec

Cosmosil and Cosmogel HPLC columns and packing materials

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5C18-PAQ column

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The COSMOSIL 5C18-PAQ is the new member of our C18 column family already including the monomeric type MS-II, the polymeric type AR-II. This new column maintains stable retention time even in 100% aqueous mobile phases because the silica is only partially coated with C18 chains. The new polymeric linking style gives a strong acidic resistance to this column.
  • Stable retention time in 100% aqueous mobile phase
  • Good separation of hydrophilic compounds
  • Resistance for acidic mobil phase
  • Low carbon content controlled packing material
  • Polymeric type linked C18
The figure shows the change of retention time for Thymine with 100% aqueous mobile phase (20mmol/l phosphate buffer pH7). After analyzed 4 times (1 hour), flow of mobile phase were stopped for 1 hour, and then similarly analyzed again. The conventional C18 showed change of retention time, but COSMOSIL 5C18-PAQ mantained stable retention time.

Material characteristics

Silicagel high purity porous spherical silica
Average particle size 5m
Average pore size approx. 120
Specific surface area approx. 300m2/g
Stationary phase polymeric octadecyl group
End capping treatment near-perfect treatment
Carbon content approx. 11%

Ordering information
COSMOSIL 5C18-PAQ Guard Column 4.6mm I.D.10mm 02484-71 Waters type
COSMOSIL 5C18-PAQ Packed Column 4.6mm I.D.150mm 02486-71
4.6mm I.D.250mm 02485-81


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