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  1. Chromservis
  2. Chromatography
  3. Stationary phases
  4. More about chromatography
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Chromatography

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          More about chromatography

          Rtx-35 MS

          (Crossbond® 35% diphenyl/65% dimethyl polysiloxane)GC column

          • Midpolarity phase.
          • Column specifically tested for low bleed performance.
          • Equivalent to USP G42 phase.
          • Rtx®-35 columns are available with Integra-Guard™ built-in guard column.

          An Rtx®-35 column is a popular confirmation column for pesticides and herbicides, in conjunction with an Rtx®-5 or Rtx®-1701 column. The higher phenyl content causes useful elution order and retention time changes.

          Applications
          • Organochlorine pesticides
          • PCB congeners or Aroclor mixes
          • Herbicides
          • Pharmaceuticals
          • Sterols
          • Rosin acids
          • Phtalate esters
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.25 0.10 40 to 320/340
          0.25 0.25 40 to 320/340
          0.25 0.50 40 to 310/330
          0.25 1.00 40 to 290/310
          0.32 0.10 40 to 320/340
          0.32 0.25 40 to 320/340
          0.32 0.50 40 to 310/330
          0.32 1.00 40 to 290310
          0.53 0.50 40 to 300/320
          0.53 1.00 40 to 290
          0.53 1.50 40 to 280/300

          Rtx-50

          (Crossbond® 100%methylphenyl polysiloxane)GC column

          • Midpolarity phase.
          • Equivalent to USP G3 phase.

          The high thermal stability of Rtx®-50 columns makes possible dual-column analysis with common phases such as Rtx®-1ms or Rtx®-5ms. Between analyses, high temperatures can be used to drive less volatile contaminants off of the column.

          Applications
          • Organochlorine pesticides
          • Herbicides
          • Rosin acids
          • Sterols
          • Triglycerides
          • Phtalate esters
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.18 0.20 40 to 310/330
          0.18 0.40 40 to 300/320
          0.25 0.25 40 to 300/320
          0.25 0.50 40 to 290/310
          0.25 1.00 40 to 280/300
          0.32 0.25 40 to 300/320
          0.32 0.50 40 to 290/310
          0.32 1.00 40 to 280/300
          0.53 0.25 40 to 280/300
          0.53 0.50 40 to 270/290
          0.53 0.83 40 to 270/290
          0.53 1.00 40 to 260/280
          0.53 1.50 40 to 250/270

          Rtx-65

          (Crossbond® 65% diphenyl/35%dimethyl polysiloxane)GC column

          • Mid to high polarity phase.
          • Equivalent to USP G17 phase.

          The Rtx®-65 phase contains the highest phenyl content of any bonded stationary phase available, to improve separation of aromatic compounds through increased phase-analyte interaction. A unique polarity makes these columns ideal for a variety of analyses, from phenols to FAMEs. As a confirmation column for EPA Method 604 phenols, an Rtx®-65 column produces a different elution order, compared to the primary Rtx®-5 column. Rtx®-65 columns elute FAMEs according to equivalent chain length, similar to bonded Carbowax® columns, but the Rtx®-65 phase does not suffer the thermal stability limitations of other polar stationary phases.

          Applications
          • Phenols
          • Fatty acids
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.25 0.25 50 to 300
          0.25 0.50 50 to 280/300
          0.25 1.00 50 to 260/280
          0.32 0.25 50 to 300
          0.32 0.50 50 to 280/300
          0.32 1.00 50 to 300
          0.53 0.25 40 to 290/300
          0.53 0.50 40 to 270/290
          0.53 1.00 40 to 250/270

          Rtx-440

          (Proprietary Crossbond® phase)GC column

          • Intermediate polarity phase.
          • Low bleed
          • High-resolution columns with unique selectivity.
          • Ideal for low/trace level analysis.
          Applications
          • Pesticides
          • PAHs
          • Semivolatiles
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.18 0.18 20 to 320/340
          0.25 0.25 20 to 320/340
          0.25 0.50 20 to 320/340
          0.32 0.25 20 to 320/340
          0.32 0.50 20 to 320/340
          0.53 0.50 20 to 320/340
          0.53 1.00 20 to 320/340

          Stx-500

          (Crossbond® carborane/dimethyl polysiloxane)GC column

          • Stx™ is used for columns that have been deactivated using Restek´s Siltek® deactivation.
          • Low bleed - ideal for GC/FPD, GC/NPD or GC/MS analyses.
          Applications
          • Brominated flame retardans
          • Coplanar PCB congeners
          • other anates with high boiling temperatures
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.25 0.15 -60 to 380°C
          0.53 0.15 -60 to 380°C

          Rxi-17

          Rxi® Capillary GC ColumnsGC column

          These columns have been designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity. In addition to outstanding performance, this combination of column characteristics assures Rxi® columns will have long lifetimes. The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi® columns will meet your needs every time you install a new column.

          Benefits of Rxi® columns
          • Ultra-low bleed
          • Exceptional inertness
          • Reproducible performance, column after column
          Applications
          • Pesticides
          • Herbicides
          • Rosin acids
          • Phthalate esters
          • Triglycerides
          • Sterols
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.10 0.10 40 to 280/320
          0.25 0.25 40 to 280/320
          0.25 0.50 40 to 280/320
          0.25 1.00 40 to 280/320
          0.32 0.25 40 to 280/320
          0.32 0.50 40 to 280/320
          0.32 1.00 40 to 280/320
          0.53 0.25 40 to 280/320
          0.53 0.50 40 to 280/320
          0.53 0.83 40 to 280/320
          0.53 1.00 40 to 280/320
          0.53 1.50 40 to 280/320

          Rxi-XLB

          (low-polarity proprietary phase)

          Rxi® Capillary GC ColumnsGC column

          These columns have been designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity. In addition to outstanding performance, this combination of column characteristics assures Rxi® columns will have long lifetimes. The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi® columns will meet your needs every time you install a new column.

          Benefits of Rxi®-XLB columns
          • Ultra-low bleed
          • Exceptional inertness
          • Unique selectivity
          • Reproducible performance, column after column

          Improvements in polymer synthesis and tubing deactivation enable us to make inert, stable Rxi®-XLB columns especially well-suited for analyzing active, high molecular weight compounds with sensitive GC/MS systems, including ion trap detectors. Excellent efficiency, coupled with inertness, low bleed, and high thermal stability, make Rxi®-XLB columns ideal for analyzing semivolatile compounds in drinking water (e.g., US EPA Method 525).

          Applications
          • Pesticides
          • PCB congeners or (e.g.) Aroclor mixes
          • PAHs
          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.10 0.10 30 to 340/360
          0.18 0.18 30 to 340/360
          0.20 0.33 30 to 340/360
          0.25 0.10 30 to 340/360
          0.25 0.25 30 to 340/360
          0.25 0.50 30 to 340/360
          0.25 1.00 30 to 340/360
          0.32 0.10 30 to 340/360
          0.32 0.25 30 to 340/360
          0.32 0.50 30 to 340/360
          0.32 1.00 30 to 340/360
          0.53 0.50 30 to 320/340
          0.53 1.50 30 to 320/340

          Rxi-5sil MS

          Rxi® Capillary GC ColumnsGC column

          These columns have been designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity. In addition to outstanding performance, this combination of column characteristics assures Rxi® columns will have long lifetimes. The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi® columns will meet your needs every time you install a new column.

          Benefits of Rxi® columns
          • Ultra-low bleed
          • Exceptional inertness
          • Reproducible performance, column after column

          The Rxi®-5Sil MS stationary phase incorporates phenyl groups in the polymer backbone. This improves thermal stability, reduces bleed, and makes the phase less prone to oxidation. Rxi®-5Sil MS columns are ideal for GC/MS applications requiring high sensitivity, including use in ion trap systems.

          Applications
          • Chlorinated hydrocarbons
          • Phthalates
          • Phenols
          • Amines
          • Organochlorine pesticides
          • Organophosphorus pesticides
          • Drugs
          • Solvent impurities
          • Hydrocarbons

          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.10 0.10 -60 to 330/350
          0.18 0.18 -60 to 330/350
          0.18 0.36 -60 to 330/350
          0.25 0.10 -60 to 330/350
          0.25 0.25 -60 to 330/350
          0.25 0.50 -60 to 330/350
          0.25 1.00 -60 to 325/350
          0.32 0.25 -60 to 330/350
          0.32 0.50 -60 to 330/350
          0.32 1.00 -60 to 330/350
          0.53 0.25 -60 to 325/350
          0.53 1.50 -60 to 310/330

          Rxi-5 MS

          GC columnRxi® Capillary GC Columns

          These columns have been designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity. In addition to outstanding performance, this combination of column characteristics assures Rxi® columns will have long lifetimes. The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi® columns will meet your needs every time you install a new column.

          Benefits of Rxi® columns
          • Ultra-low bleed
          • Exceptional inertness
          • Reproducible performance, column after column
          Applications
          • Semivolatiles
          • Phenols
          • Amines
          • Residual solvents
          • Drugs of abuse
          • Pesticides
          • PCB congeners or (e.g.) Aroclor mixes
          • Solvent impurities

          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.10 0.10 -60 to 330/350
          0.18 0.18 -60 to 330/350
          0.18 0.30 -60 to 330/350
          0.18 0.36 -60 to 330/350
          0.20 0.33 -60 to 330/350
          0.25 0.25 -60 to 330/350
          0.25 0.40 -60 to 330/350
          0.25 0.50 -60 to 330/350
          0.25 1.00 -60 to 330/350
          0.32 0.25 -60 to 330/350
          0.32 0.50 -60 to 330/350
          0.32 1.00 -60 to 330/350
          0.53 0.25 -60 to 330/350
          0.53 0.50 -60 to 330/350
          0.53 1.00 -60 to 330/350
          0.53 1.50 -60 to 330/350

          Rxi-1 MS

          GC columnRxi® Capillary GC Columns

          These columns have been designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity. In addition to outstanding performance, this combination of column characteristics assures Rxi® columns will have long lifetimes. The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi® columns will meet your needs every time you install a new column.

          Benefits of Rxi® columns
          • Ultra-low bleed
          • Exceptional inertness
          • Reproducible performance, column after column
          Applications
          • Drugs of abuse
          • Essential oils
          • Hydrocarbons
          • Pesticides
          • PCB congeners and Aroclor mixtures
          • Sulphur compounds
          • Amines
          • Solvent impurities
          • Simulated distillation
          • Oxygenates
          • Gasoline
          • Refinery gases

          Temperature limits
          ID (mm) df(µm) Temperature limits (°C)
          0.10 0.10 -60 to 330/350
          0.18 0.18 -60 to 330/350
          0.18 0.36 -60 to 330/350
          0.20 0.33 -60 to 330/350
          0.25 0.25 -60 to 330/350
          0.25 0.50 -60 to 330/350
          0.25 1.00 -60 to 330/350
          0.32 0.25 -60 to 330/350
          0.32 0.50 -60 to 330/350
          0.32 1.00 -60 to 330/350
          0.32 4.00 -60 to 330/350
          0.53 0.50 -60 to 330/350
          0.53 1.00 -60 to 330/350
          0.53 1.50 -60 to 330/350