caustic etch

caustic etch, frosted finish

A decorative matte texture produced on aluminum alloys by an etching treatment in an alkaline solution, generally caustic soda.
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While meeting and exceeding all AAMA 611 specifications for anodizing, the acid etch anodic process is far better in hiding extrusion surface imperfections than caustic etch anodizing.
More environmentally friendly and greener than a conventional caustic etch process, the acid etch process requires less etching time, which significantly reduces the amount of waste sludge disposal by as much as 90%.