Capillary silicone phase properties

The use of these constants is described in the table in the section entitled Properties of Some Liquid Phases for Packed Columns. The viscosity data, where available, are presented in cSt, which is 10 m2/sec. Cross-linked silicone phases based on the silicones are especially valuable for capillary gas chromatography. They are not specifically treated in this table since the differences in many properties are quite often subtle. The cross-linked phases have much longer lifetimes due to the effective immobilization. 

The liquid stationary phases used with capillary columns are similar to those used in packed columns. The most common stationary phases are polysiloxanes (silicones) that contain various substituents that modify the polarity of the phase. Polydimethyl siloxane (methyl silicone) is nonpolar. Replacing methyl groups with increasing numbers of phenyl substituents increases the polarity of the silicone. For example, J W DB-1, or a similar stationary phase sold by other companies, has the same properties as methyl silicone (SE-30 or DC-200) and is used with nonpolar... 

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