Process for etching glass capillaries for chromatography

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

1983-07-22

1984-07-10

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

65 31, 252 793, 252 794, 427309, B44C 122, C03C 1500, C03C 2506

Patent

active

044591730

ABSTRACT:
An improved process for etching (eroding) the inner surface of a glass capillary column in which ammonium bifluoride in liquid methanol is passed slowly through the capillary bore for a prolonged period, followed by rinsing with methanol, thereafter a gradually diluting rinse mixture of methanol 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.

REFERENCES:
American Chemical Society, Dec. 1978, Etching and Deactivating Glass Capillary Columns for Gas Chromatography by R. Heckman et al., pp. 2157-2158.

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