ETCHING PASTE Russian patent published in 2012 - IPC C09K13/00 C03C15/00 

FIELD: chemistry.

SUBSTANCE: invention relates to materials for processing glass, glass-ceramic and quartz surfaces, and can be used in optoelectronics to make optical components. The paste contains ammonium hydrofluoride (NH₄F·HF), barium sulphate (BaSO₄), sulphuric acid (H₂SO₄), isoamyl acetate, granular alkali-earth metal fluoride with granule size 25-63 mcm and water. Components are in the following ratio, wt %: ammonium hydrofluoride - 10-34; barium sulphate - 17-22; sulphuric acid - 2-4; isoamyl acetate - 1-2; alkali-earth metal fluoride - 10-34; water - the rest. The disclosed paste has low toxicity due to low concentration of active fluoride ions as a result of using ammonium hydrofluoride instead of hydrofluoric acid.

EFFECT: use of the paste enables to obtain a coarse-grained surface with roughness of up to 65 mcm.

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