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Gas Chromatography
CM Scientific is a European distributor for Polymicro Technologies LLC based in Phoenix, Arizona, USA. Polymicro Technologies are specialist in the manufacture of internally Uncoated Flexible Fused Silica Capillary for use in Gas Chromatography (GC) Columns. Polymicro's GC capillary are used by many of the world's leading OEM's in their Gas Chromatography products.
Although capillary tubing is now used over a broad range of applications, its history is inseparable from that of Gas Chromatography. According to the International Union of Pure and Applied Chemistry (IUPAC), “Chromatography is a physical method of separation in which the components to be separated are distributed between two phases, one of which is stationary (stationary phase) while the other (the mobile phase) moves in a definite direction”.[1] In Gas Chromatography (GC), the mobile phase is a gas and the stationary phase is either a solid or a liquid, depending on the type of separation column selected. The actual separation of components in a mixture is achieved due to the differential distribution of solutes between the mobile and stationary phases. Capillary is fundamental to the technique, as it is the support for the stationary phase and the conduit through which the mobile phase travels.
One of the first applications for capillary tubing was in the Gas Chromatography industry. Dandeneau and Zerenner’s pioneering efforts are recognized by many as the cornerstone for the introduction of fused silica based capillary as a support for GC columns.[2] Continued improvements in GC analysis have been aided by the unique properties of synthetic fused capillary tubing, with the majority of new methods rooted in proprietary new stationary phase coatings. Since its first use in the late 70’s, the range of capillary tubing internal diameters (ID) has grown, and specification tolerances have continually tightened to meet the exacting demands of the column manufacturing industry. Numerous GC column manufacturers offer a broad selection of columns used in the analysis of food products, pharmaceuticals, clinical samples, petroleum, and a variety of other applications.
Polymicro produces a wide range of capillary designed specifically for GC applications. Capillary with ID’s ranging from 50mm up to 750mm are routinely used, with the majority of columns employing capillary between 180mm and 530mm. Two product lines are commonly used, these being the standard TSP and high temperature TSG. Although Polymicro communicates the specifications in micrometers, most column manufacturers list column diameters in millimeters. It is common to name a column by a combination of the ID and stationary phase. Buy online now!
[1] McNair, H. M., Miller, J. M., Basic Gas Chromatography, Chapter 1, John Wiley & Sons, Inc. New York, (1997) [2] Dandeneau, R. D., Zerenner, E. H., HRC&CC 2(6), (1979) 351-356. Gas Chromatography information supplied by Polymicro Technologies LLC.
GC Capillary Column Products
Polymicro's standard fused silica capillary range includes polyimide and UV transparent coatings, alternative buffer coatings and custom sizes are available - please contact us to discuss your requirements.
GC Capillary can be purchased in a variety of formats, including:
Bulk: The majority of capillary for GC Columns is supplied to the market in long, continuous lengths on polystyrene reels. Reel length is dependent on customer requirements but is generally 10-100m. Buy online now!
Pre-cut: Capillary is often pre-cut to customer specified dimensions. Different quality of end finishes are available.