Interior Surfaces of Capillaries

The interior surface of capillaries made by the etching process is the smooth interface between the polished surfaces of the cladding and the etchable core. After the chemical removal of the etchable core element, few defects larger than 1/100th of a capillary diameter remain. The etched holes can be individually straight and parallel, and (within the limits of the etching process) curved and twisted collectively. Diameter variation from capillary to capillary is typically less than 2% along the length.

For drawn capillaries, the interior is fire polished during the draw process, producing a smooth, virtually defect-free surface. Drawn capillaries are more easily formed into non-parallel, non-linear forms than etched capillaries.



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