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Previous by Date: Subject: Re: [DCHAS-L] Upper limit of pH hazards Date: Monday, October 31, 2016 at 1:15:04 PM Author: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**KEENE.EDU> |
Next by Date: Subject: Re: [DCHAS-L] Upper limit of pH hazards Date: Mon, 31 Oct 2016 17:50:09 +0000 Author: DAVID Katz |
Hi Ralph,
The time the material is in contact with the rinse may be just as important as the number of rinses if this material is porous. If the rinse is quick, you could have a fair amount of sodium hydroxide left in the material that could then leach out once it enters the world of things.
Kristi
________________________________________
From: ACS Division of Chemical Health and Safety [DCHAS-L**At_Symbol_Here**PRINCETON.EDU] on behalf of Stuart, Ralph [Ralph.Stuart**At_Symbol_Here**KEENE.EDU]
Sent: Monday, October 31, 2016 1:15 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
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
Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College
ralph.stuart**At_Symbol_Here**keene.edu
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For more information about the list, contact the Divisional secretary at secretary**At_Symbol_Here**dchas.org
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