GC GsBP Columns

GC Column selection

Stationary Phase

PolysiloxanePolyethylene Glycol (PEG)PLOTPacked ColumnsGuard Columns


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GC Columns by Stationary Phases

GS-Tek offers wide ranges of GC columns coated with the stationary phases equivalent or similar to commercially available phases. All stationary phases are carefully prepared to control its purity, polarity and thermal stability. Table I lists out general information for all stationary phases GS-Tek offers.

1. Polysiloxane Based Stationary Phase

Polysiloxanes are the most common stationary phases for general separations. They are relatively stable, robust and versatile to a wide range of applications. Different functional groups that substitute to the methyl group on the silicon atom characterize the polarity of polysiloxane. Carefully controlling the polymer synthesis, capillary tubing surface treatment and other manufacturing processes can control column characteristics, such as polarity, retention, efficiency and inertness, and replication of column performance with very small variation margins.

GS-Tek offers non-polar and mid-polar polysiloxane phase columns. GsBP-1 and GsBP-5 are examples of non-polar phases, GsBP-35MS, GsBP-50+MS, GsBP-1301, and GsBP-1701 are examples of mid-polar phases. Some examples of specially designed mid-polar phases for environmental applications are GsBP-624, GsBP-VMS and GsBP-XLB. GS-Tek offers a broad line of low bleed columns for GS-MSD, GC and other instrument applications.

Polarity categoryProduct CategoryUSP Code2-digitsDetail
Non-polarGsBP-1, GsBP-1MS, GsBP-1MS-InertG1, G201, 11100% polydimethylsiloxane, crosslinked, maximum temperature limit, equivalent to most -1 phases, with improved thermal stability and inertness, suitable for general applications.
Non-polarGsBP-5, GsBP-5MS, GsBP-5MSUIG2705, 15Poly 5% phenyl 95% dimethyl arylene siloxane, cross-linked, high temperature limit, equivalent to most -5 phases, with improved thermal stability and inertness. Suitable for general applications
Non-polarGsBP-Ultra-1, GsBP-Ultra-2 02, 03 
Non-polarGsBP-XLB 16Poly(dimethyl-diphenyl)siloxane with high phenyl content, with improved selectivity to cyclic and aromatic hydrocarbons
Non-polarGsBP-PONAGsBP-DHAG190100% polydimethylsiloxane, cross-linked, specially designed for hydrocarbon separation
Non-polarGsBP-Sel Alcohol, GsBP-EtOHG141 
Non-polarGsBP-Sulfur, GsBP-AmineG177100% polydimethylsiloxane, cross-linked, after special treatment can improve the inertness of siloxane, used for sulfur and amine analysis
Medium polarityGsBP-35MSG4235Poly(65% dimethyl, 35% diphenyl) siloxane, cross-linked, high thermal stability and inertness. Popular choice for phenol/aromatics separation
Medium polarityGsBP-50 + MS, GsBP-608G350, 51, 52Poly(50% dimethyl, 50% diphenyl) siloxane, cross-linked, high thermal stability and inertness. Equivalent to most -17/-50 phases. Common choice for separation of phenol, cyclic and polar molecules
Medium polarityGsBP-1301G4360Poly(94% dimethyl, 6% cyanopropyl) siloxane, cross-linked, high temperature limit, with improved thermal stability and inertness.
Medium polarityGsBP-624, GsBP-VMS, GsBP-502.2G4362, 63, 64Poly(94% dimethyl, 6% cyanopropyl phenyl) siloxane, specially designed and treated, cross-linked, high temperature limit, with improved inertness, popular choice for volatile organic chemicals (VOC).
Medium polarityGsBP-1701, GsBP-1701MSG4661, 67Poly(86% dimethyl, 14% cyanopropylpropyl phenyl) siloxane, cross-linked, high temperature limit, with improved thermal stability and inertness
Medium polarityGsBP-225MSG2666Poly(50% dimethyl, 50% cyanopropylpropyl phenyl) siloxane, cross-linked, high temperature limit, with improved thermal stability and inertness
Strong polarityGsBP-FAMEG570<High content of cyanopropylphenyl polysiloxane, cross-linked, used for isomer separation

2. Polyethylene glycol based Stationary Phase

GS-Tek offers three types of polyethylene glycol stationary phase chromatography columns: GsBP-Inowax and ultra-low bleed GsBP-Inowax-MS columns; GsBP-FFAP columns and GsBP-CarboWax 20M columns. It is suitable for all applications that require PEG stationary phase chromatography columns.

Polarity categoryProduct CategoryUSP CodeThe first two digits of the article numberDetail
polarGsBP-Inowax, GsBP-InowaxMSG1620, 24Cross-linked polyethylene glycol is specially treated to increase the operating temperature to 260 – 280°C and increase the inertness of the column. It is very popular in many polar/non-polar chemical analyses.
polarGsBP-FFAPG25, G3521Highly polar nitroterephthalic acid modified polyethylene glycol (PEG) polar chromatography column for the analysis of volatile fatty acids and phenols
polarGsBP-CarbowaxG1622Classic polyethylene glycol, uncrosslinked, can be freeze-dried at -20°C, suitable for food/fragrance and pharmaceutical applications
polarGsBP-Wax-AQG1626Cross-linked polyethylene glycol is specially treated to improve the column life and column inertness of high-concentration aqueous samples. Widely used in pharmaceutical, food, chemical and environmental applications.
polarGsBP-FAMEWaxG1668Cross-linked polyethylene glycol has been specially treated to increase the operating temperature to 260-280C and increase the inertness of the chromatographic column. It is often used for nutritional analysis.

3. PLOT stationary phase

The stationary phase of the porous-layer open-tubular (PLOT) is composed of a variety of particulate adsorbents (layers) . The ultra-high adsorption layer surface area, providing the highest column capacity required for separation. We improved the coating and no longer need to connect the trapping column (device). A variety of stationary phase types are available (high column selectivity), suitable for multiple method applications, especially for the analysis of volatile or gaseous compounds. Besides, it is a ideal alternative for the same type of packed column. PLOT column can be customized according to customer requirements.

Polarity categoryProduct CategoryUSP CodeThe first two digits of the article numberDetail
Aluminum oxideGsBP-Al2O3, KCL 81Porous aluminum hydrate modified with salt KCl, ideal for the analysis of hydrocarbons and diene/alkynes
Aluminum oxideGsBP-Al2O3, S 82Salt “S” modified porous aluminum hydrate, ideal for separation of hydrocarbons and C2 to C5 olefins
Aluminum oxideGsBP-Al2O3 M 83
Salt “M” modified porous aluminum hydrate is a good choice for separation of hydrocarbons, cyclic compounds and diene
Aluminum oxideGsBP-Al2O3 FRGA 80
Special aluminum hydrate
Zeolite molecular sieveGsBP-MS 5A 84
Molecular sieve, type 5A zeolite, ideal for stationary gas separation
Porous silicaGsBP-GasPro 85
Proprietary porous silica with deactivation effect, suitable for halogen and sulfur analysis
Porous polymerGsBP-PLOT QS386polystyrene-divinylbenzene (DVB), highly porous, increasing the temperature limit to 280°C, and inert, used for CO2, H2O, thiamine for C1 to C3 hydrocarbons
Porous polymerGsBP-PLOT UG4587divinylbenzene/ethylene glycol dimethacrylate copolymer, cross-linked, porous, temperature limit increased to 200°C, inert, more selective to CO2, H2O, and thiamine, increasing from C1 to C3 Hydrocarbon resolution

Packed Columns

Packed columns are traditional tools used for separation but are still prevailing in the industry. They are used in many gas chromatograph applications such as petroleum industries, food, chemicals, and others. GS-Tek offers packed columns in stainless steel tubing format, with complete well-known packing materials. GS-Tek also offers micropack columns for separation improvement and custom-made columns.

  • Most packed columns are not preconditioned. End user should precondition column at manufacturers specified maximum temperature prior to use.
  • Packed columns historically have different coil and connection configurations from various Gas Chromatograph brand.
  • Packed columns are not manufacture-tested. Batch variation may exist.

Guard Columns

Guard column is commonly used as a retention gap and guard column or sample transfer line. The column is inert and near neutral surface and used for protecting analytical columns from dirty sample introduction. They can prolong analytical column life, as the trap the most “dirty” or undesired compounds. We offer four types of guard column:

  • Deactivated fused silica tubing: We provide two types of modified surface non-polar with methylsilane and PEG. We can also offer other deactivation methods upon requesting.
  • Deactivated metal column
  • Particle trapped guard column: We provided guard column with proprietary phase for particle trap, which specially used with PLOT column to prevent particle entering detector.
  • Undeactivated fused silica tubing: No deactivated process and affordable price.