On Jul 26, 2018, at 11:33 AM, Nickie Norton <nnorton**At_Symbol_Here**SHEPCHEM.COM> wrote:

If you are looking for heating with stirring of different sized vessels, Chemglass Lifesciences sells hot plate stirrers with temperature control that you can purchase various sized blocks for (different sized vials to small round bottoms) that might meet your needs.  I have used them at a previous job in pharma and they worked well for us.  You can do different sized vials at the same time as long as the temperature setting is the same for all reactions being run.  

Nickie Norton


-----Original Message-----
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of DCHAS Membership Chair
Sent: Thursday, July 26, 2018 11:23 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] RE; Safer heating devices

From: "Tammy M. Lutz-Rechtin" <tlutzrec**At_Symbol_Here**uark.edu>
Date: July 26, 2018 at 11:21:11 AM EDT

A "one size fits all" approach will not work for chemistry. Heating blocks are great for small volumes with multiple repetitions but not for other applications where you could create heat pockets within the solutions. Specifics are important when choosing a heating method.  Depending on the temperature required, heating rate, length of heating, apparatuses involved, potential chemical and physical hazards, and mixing requirements, I might choose one method over another.  The chemists should know the best method to be used.

One might want to demonstrate different methods to students. Every experiment does not need to be in a "kit" format. Personally, I am getting tired of everyone making everything so streamlined that students have no idea how to deal with varying methodology, hazards or think through situations.  

Tammy Rechtin
Chemical Engineering Safety Coordinator

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