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RE: Replacement for MEK for Screen Printing



Tammy and Todd,
I will forward this thread to Printech for any further input.  Marci Kinter 
of the Screenprinting and Graphic Imaging Association International (SGIA) 
participates in Printech and is always an excellent source of information 
on compliance and P2 issues related to screen printing.  I will forward any 
responses at Printech to the P2Tech listserv as well.
-Wayne


At 01:47 PM 1/10/2002 -0500, Todd MacFadden wrote:
>Hi Tammy,
>
>I just did some work researching alternative cleaners for adhesive 
>removal, using Hansen Solubility Parameters (HSP) to help match cleaners 
>to resins. According to HSP, a 50:50 blend of DuPont DBE (di-basic ester) 
>and propylene carbonate should perform very similarly to MEK.
>
>You can learn more about DBE on
>http://www.dbe.dupont.com/
>
>You can learn about HSP in general on:
>http://wwwchem.murdoch.edu.au/staff/barton/parameters.html
>
>Good luck,
>Todd
>
>
>At 08:06 AM 1/10/02 -0500, you wrote:
>>Tammy,
>>I'm copying your question to <mailto:printech@great-lakes.net>. If not
>>subscribed to printech, you may wish to check it out or explore the Printers
>>National Environmental Assistance Center (PNEAC) at <http://www.pneac.org/>
>>Like p2tech, there is a searchable archive.
>>Ric
>>         -----Original Message-----
>>         From: Tammy Allen [mailto:tallen@co.pinellas.fl.us]
>>         Sent: Wednesday, January 09, 2002 10:31 AM
>>         To: p2tech@great-lakes.net
>>         Subject: Replacement for MEK
>>
>>         Can anyone identify a potential alternative cleaning solvent for MEK
>>in the following application:
>>         A facility is trying to eliminate the use of MEK in cleaning, but
>>has hit a snag in their screen cleaning (screen printing). The inks they use
>>are MEK-based and cannot be changed currently due to their government
>>customer specs. The MEK is wiped on an 8x8 screen. So far, they tried ethyl
>>acetate, but it dissolved the PVA in the screen. Now they are trying
>>acetone, but the employees complain of smell and health hazards. Any
>>suggestions on a solvent that is safe and could quickly remove an MEK-based
>>ink without hurting PVA-based materials?
>>         Thank you for any assistance,
>>         Tammy L. Allen
>>         Senior Environmental Specialist
>>         Pinellas County Environmental Management
>>         512 S. Ft. Harrison Ave.
>>         Clearwater, FL 33763
>>         (727) 464-4761
>>         Fax (727) 464-3174
>>         e-mail: tallen@co.pinellas.fl.us <mailto:tallen@co.pinellas.fl.us>
>

Wayne P. Pferdehirt
Director, MEPP, http://mepp.engr.wisc.edu/
Co-Director, PNEAC  http://www.pneac.org
Specialist, SHWEC, http://www.uwex.edu/shwec/
tel 608.265.2361
fax 608.262.6250