Extrusion of a Fused-Silica Capillary Column

Three steps are involved in the preparation of a fused-silica column (1) the high-temperature extrusion of the blank capillary tubing from a preform, where the capillary receives a protective outer coating in the same process (2) the deactivation of the inner surface of the column and (3) the uniform deposition of a stationary phase of a desired film thickness on the deactivated inner surface. In this section the extrusion of fused silica is described the procedures employed for the deactivation and coating of fused-silica capillaries are presented in the following section. 

The publications of Macomber et al. are recommended to the interested reader desiring more in-depth knowledge of the properties and process of preparing fused capillaries not only for GC but also for capillary LC, capillary electrophoresis (CE), and capillary electrochromatography (CEC) (15-21). As noted by Macomber 

TABLE 3.6 Fused-Silica Tubing Specifications (jxm) in the Period 1990-2001  

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