There are a number of methods and devices used for connection of capillary.  Selecting an appropriate connector depends on the application(s) and size of capillary being used. Suggestions are discussed below.

There are two basic connection types used in GC applications. 1) A Swagelok^® or equivalent compression fitting with appropriate Vespel^® insert is common for end of column connections. The capillary is held by a compression fit to the polyimide buffer, making this a robust connection. A number of options are available from most GC Column manufacturers. 2) Capillary to capillary connections are often accomplished using tapered silica or quartz micro components called Inner-Loks™. These connectors accept a range of capillary sizes and offer a simple, clean method for coupling. Using silica, as opposed to borosilicate, as the coupling material provides a good thermal expansion match. The capillary can be bonded after insertion into the Inner-Lok™ making a more permanent connection.

Connections in LC and related fluidic applications normally employ compression fittings made of polymeric materials, such as PEEK™. A number of manufacturers offer connector products compatible with Polymicro capillary. Many of these fittings are pressure rated, and are designed for simple, fast assembly of capillary into instrumentation.

Custom connections and terminations of capillary are available from Polymicro. Key design considerations include end finish, ID cleanliness, strain relief, pressure requirements, operating temperature, solvent compatibility, and construction of the mating fitting.