Glycerin use at wbgeneral

Mahnaz Mansourpour mahnaz at
Tue Aug 2 15:22:31 PDT 2011

Hi Scott,

Your request has been approved, with the following:

To bring your chemical in the lab, First make sure to obtain a yellow 
label and log the chemical on the logsheet in my office.

Place your chemical in the top shelf (for personal chemicals) in the 
chemicals pass-through, from the hall way  (ask a Staff member to open it).
You can access the chemical from inside the lab when you go inside.

As you mentioned, there were only be small amount of the chemical at the 
time of processing.
The mixture to be used at room temperature.
The waste should be collected and labeled with all the appropriate 
As Uli has suggested,   the bench ( wbgeneral)  be reserved on both side 
when you are working.

Let me know if you have any questions.


On 8/2/2011 11:13 AM, Scott Lee wrote:
> Hi all,
> I talked to Mahnaz who wanted more process specifics and details about 
> glycerin.  I will be etching pieces at wbgeneral.  As stated earlier, 
> I will use a 5:3 BOE:glycerin mixture.  Since I will be working with 
> pieces, the quantity of the solution will be small (~500mL every 2 
> weeks).  The mixture will be used at room temperature.  Teflon and 
> plastic beakers will be used.  The waste will be specially collected 
> as per hazardous waste protocol and not be drained down the HF drain.
> The MSDS (link attached below) says that it may explode on contact 
> with chromium trioxide, potassium chlorate, and potassium 
> permanganate.  It also says to avoid contact with sulfuric and nitric 
> acids (leads to explosive glyceryl nitrate).  Uli recommended 
> reserving and enabling both sides of wbgeneral.  The recommendation 
> seems good to me to ensure that no one is using sulfuric acid or 
> nitric acid in the near vicinity.  Other than that, it's boiling point 
> is 290C and flashpoint is 177C.
> According to wikipedia, glycerin is found in a wide variety of 
> products including diet foods, laxatives, and cough syrup.
> Let me know if any other information would be of interest.
> Cheers,
> Scott
> Wikipedia
> On Tue, Aug 2, 2011 at 8:17 AM, Scott Lee <wslee at 
> <mailto:wslee at>> wrote:
>     Hi specmat,
>     Any response on my proposal to use glycerin at wbgeneral?  I
>     talked to Uli and it seems like the main concern is whether I can
>     dispose of the glycerin/BOE solution in the HF drain or if it
>     needs to be disposed of in the hazardous waste in the acid storage
>     cabinet.  Feedback would be greatly appreciated.
>     Thanks,
>     Scott
>     On Tue, Jul 26, 2011 at 12:03 PM, Scott Lee <wslee at
>     <mailto:wslee at>> wrote:
>         Hi all,
>         I wasn't sure who to send this to so I decided to send it to
>         the safety and specmat mailing lists.
>         I am working with a collaborator in Illinois on hafnium
>         diboride (HfB2) as a hard, conductive material.  I need to
>         selectively etch SiO2 without etching the HfB2.  My
>         collaborator says his group has had success using a 5:3
>         BOE:glycerin solution where the BOE is 7:1 40%NH4F:49% HF.
>         I would like to use this solution at wbgeneral since I will be
>         working with HF and I need to go to CPD afterwards.  Since
>         glycerin is an alcohol (which is not normally permitted at
>         wbgeneral), I wanted to make sure it is okay to use.  Let me
>         know if you have any concerns.  I attached the link to the
>         MSDS sheet below.
>         Thanks,
>         Scott
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