For some additional perspective, most soaps have a pH between 9 and 10
before dilution. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4171909/
In the world of metalworking, most metalworking fluids are buffered to
between 8.8 and 9.2. Dermatitis becomes a problem above 9.5. Machine
operators have intermittent contact with fluids when handling wet parts.
Gloves are often not worn because they may be a safety hazard for certain
From: ACS Division of Chemical Health and Safety
[mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Stuart, Ralph
Sent: Monday, October 31, 2016 12:15 PM
Subject: Re: [DCHAS-L] Upper limit of pH hazards
>why would one work actively in a chemistry lab without gloves?
The 3D printer pieces will not be used in the lab setting; there is concern
that the printed pieces could have micropores that retain corrosive liquids
longer than other types of materials. The student project will be to
determine the pH of the rinse water after each rinse to see how long it
takes to reach a "safe" level for the piece to leave the lab and enter the
world of things. Hence the question of what "safe" means.
Thanks to everyone for helping me to refine the question.
Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College
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Health and Safety.
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