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Subject: Re: [DCHAS-L] DCHAS-L Digest - 7 Sep 2020 to 8 Sep 2020 (#2020-163)
Date: Thursday, September 10, 2020 at 3:55:25 PM
Author: Joe Sabol <jsabol**At_Symbol_Here**CHEM-CONSULT.COM> 		Next by Date:
Subject: Re: [DCHAS-L] Knoxville Fire Dept warns of public distribution of 'dangerous' chemical this week
Date: Thu, 10 Sep 2020 16:08:10 -0400
Author: jeskiekb**At_Symbol_Here**comcast.net

From: edward sage <sage7652**At_Symbol_Here**BELLSOUTH.NET>
Subject: Re: [DCHAS-L] demonstration safety shield material
Date: Thu, 10 Sep 2020 20:03:57 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 1755269945.2711661.1599768237450**At_Symbol_Here**mail.yahoo.com
In-Reply-To


Have been surprised that there has been no mention of tempered glass, or even better, laminated glass or wire-reinforced glass as the best safety shield material for use in a chemical environment. If you are considering a plastic material, strongly suggest that you familiarize yourself with the stress cracking/crazing of polymers, especially polycarbonate.

Here are two articles which can serve as an introduction to a large area of chemistry.

https://scholar.google.com/scholar?q=polycarbonate+stress+cracking&hl=en&as_sdt=0&as_vis=1&oi=scholart

https://www.plasticstoday.com/materials-analyst-part-22stress-cracking-how-avoid-silent-killer-part-1

Ed Sare
On Wednesday, September 9, 2020, 03:57:52 AM EDT, ILPI Support <info**At_Symbol_Here**ilpi.com> wrote:


Polycarbonate (trade name Lexan) is the ideal material.   Better impact and crack resistance than acrylic.  Polycarbonate scratches more easily, but it's worth the impact protection, hands down. Check out this video comparing the two: https://youtu.be/Hsls5ZPCUnE

Rob Toreki

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On Sep 8, 2020, at 2:55 PM, Heather Zimmer <heather_zimmer**At_Symbol_Here**MILTON.EDU> wrote:

Hi everyone - 

We are putting up plexi shields to that clamp on the bench to divide them in half so students can work at opposite ends of the bench, facing each other.  My department chair just suggested that we order some of them in a "thicker plexi" so they can be repurposed as demonstration shields, something I have been advocating for for several years now.  Looking online, the shields I am finding are listed as "thick polycarbonate" (one site specifically said 3/16 in) or "acrylic".  Is there something more specific that you can recommend?  Members of my department really like to push beyond the boundaries of what I consider safe for chemistry demos, so I would love to protect students however I can.  

Thank you,
Heather Wages Zimmer

Science Department
Outreach Team
Norris House Advisor

Milton Academy

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