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From: Stuart, Ralph <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
Subject: Re: [DCHAS-L] Upper limit of pH hazards
Date: Oct 31, 2016 15:43 UTC
Reply-To:
ACS Division of Chemical Health and Safety
In-Reply-To:
>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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