Process for etching glass capillaries for chromatography

Details Process for etching glass capillaries for chromatography Process for etching glass capillaries for chromatography

B - Operations, Transporting

44

C

252/34

B44C 1/22 (2006.01) B01D 15/08 (2006.01) C03C 15/00 (2006.01)

Patent

CA 1187065

ABSTRACT OF THE DISCLOSURE An improved process for etching a surface of a glass capillary column in which ammonium bifluoride in an organic solvent is passed slowly through the capillary bore for a prolonged period, followed by rinsing with an organic solvent, thereafter a gradually diluting rinse mixture of an organic solvent and water, and finally a pure water rinse. A very fine structured etch of uniform depth is produced with no apparent air entrainment making the columns suitable for all standard stationary phase coating procedures.

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