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.

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

Cosmosil 5C18-PAQ Column

Item Catalog Price ($U.S.) Buy
5C18-PAQ – Analytical Guard Column, 4.6 x 10.0 mm 02484-91 $206.00 Add to cart
5C18-PAQ – Analytical Column, 4.6 x 250 mm 02485-81 $422.00 Add to cart
5C18-PAQ – Analytical Column, 4.6 x 150mm 02486-71 $391.00 Add to cart