>I would caution saying that all pH chemicals above or below a certain limit are safe. The characteristics, toxicity and permeation rates need to be thoroughly understood.

Good point, the way I framed the question was overly simplistic. My concern is specific to sodium hydroxide used to dissolve excess materials on 3D printed objects. The question is how many rinses does it take for the rinse water to become non-hazardous.

- Ralph

Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College

ralph.stuart**At_Symbol_Here**keene.edu

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