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Purospher® STAR RP-18 Endcapped 125-4 Hibar® RT HPLC Column, 120 Å, 3 µm, 4 × 125 mm - 150431

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Purospher® STAR RP-18 Endcapped Hibar®

Inner Diameter (I.D.): 4 mm
Length: 125 mm
Package Contents: 1 Column


Purospher® STAR RP-18 endcapped HPLC columns are designed for universal use. Basic, neutral, and metal chelating 
compounds can easily be separated with simple mobile phases – naturally without peak tailing! Thanks to its 
outstanding performance and stability, Purospher® STAR RP-18 endcapped offers maximum flexibility in method 
development. Robust methods can be developed over the entire pH range from 1.5 to 10.5. The high pH-stability up 
to pH 10.5 allows the separation of strongly basic compounds with alkaline eluents. The combination of high purity 
silica, best all-round retention characteristics, outstanding pH stability up to pH 10.5, and suitability for up to 100% 
aqueous mobile phases, make Purospher® STAR RP-18 endcapped an all-round top performance column, almost 
universal in its range of applications.

The traditional heart of HPLC is the “ready-to-use” column with threads at both ends onto which reducers for capillary 
connection are screwed. As a rule, precolumns are coupled with the main column via capillaries. If the column is 
exhausted, the user has two possibilities: Refilling, provided aggressive eluents do not prevent this by causing corrosion 
or worn threads, or the whole column is discarded. Column refilling without tube revision is problematic in view 
of GLP since each column has a different “history” and a different pretreatment for each new assignment.


Purospher® STAR RP-18 endcapped benefits
  • Highest silica purity (99.999%) for excellent peak symmetry
  • High separation efficiency
  • Absolutely reproducible results from run-to-run and from batch-to-batch
  • Best all-round performance according to Tanaka
  • Outstanding pH-stability from pH 1.5 - 10.5
  • No phase collapse when using highly aqueous mobile phases
  • Good suitability for LC-MS applications

Specification of Purospher® STAR RP-18 endcapped

Sorbent characteristics: High purity silica with polymeric C18 modification and endcapping
Metal content: Na, Ca, Mg, Al: 1 ppm; Fe: 3 ppm
Particle shape: spherical
Particle size: 2 μm, 3 μm and 5 μm
Pore size: 12 nm (120 Å)
Pore volume: 1.1 mL/g
Specific surface area: 330 m²/g
Carbon load: 17% C
Coverage of the surface: 3 μmol/m²
Efficiency: 5 μm > 90,000 N/m | 3 μm > 130,000 N/m | 2 μm > 180,000 N/m
pH range: pH 1.5 - 10.5
Shipping eluent: Acetonitrile/Water

  • Model: 1.50431.0001
  • Manufactured by: Merck Chemicals

Product 43/101

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