Description General description Grease-free design eliminates contamination and frozen joints. Consists of column and flow controller. Order solvent reservoir separately. See the Air-Sensitive section for a description of the threaded joint. Application Flash chromatography is useful for rapid, preparative separations with moderate resolutions. As first described in J. Org. Chem., 43, 2923 (1978), it is commonly performed with silica gel although the use of reversed phase packings has become popular in recent years. Linkage See the Threaded Ground Glass Tutorial to see how threaded joints work.