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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.

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.

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.

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.