Homebrew PCBs

KPR developer is listed here as a mixture of xylenes, ethylbenzene, and 2-methoxyethylacetate (cas110-49-6).  Another name for the latter is ethanol, 2-methoxy, 1-acetate.  In other words, it is ethyl acetate with a methoxy attached to the end of the ethyl group.

http://www.mgchemicals.com/msds/english/718.pdf

Shelf life is probably quite good.  The 2-methoxyethylacetate might hydrolyze a little, if any water is present.  As for making it, one might be able to omit the ethylbenzene entirely from a workable substititute, or substitute toluene for it.  If you eliminate the ethylbenzene, increase the amount of xylenes to compensate.  If you use toluene, I would consider reducing its concentration to about half of the ethylbenzene concentration and making up the difference with xylenes.

I suspect the methoxyethylacetate or something similar is essential.  Diglyme might work.  You won't be able to find either at a consumer store.  Since you will end up ordering something, it might as well be the original methoxyethylacetate.

John


  
  ----- Original Message ----- 
  From: lemar 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Thursday, March 08, 2012 7:13 PM
  Subject: [Homebrew_PCBs] Re: KPR developer


    
  Thanks, I'll give that a try. Any idea what the shelf life is for KPR?

  --- In Homebrew_PCBs@yahoogroups.com, "bebx2000" <bebx2000@...> wrote:
  >
  > 
  > 
  > I think the Datak negative spray-on photoresist is the same as the old KPR. The resist and developer are listed at the bottom of this page,
  > 
  > http://shop.vetcosurplus.com/catalog/default.php?cPath=94_153
  > 
  > Baxter
  > 
  > --- In Homebrew_PCBs@yahoogroups.com, "lemar" <doyle51241@> wrote:
  > >
  > > i have some Kodak KPR photoresist left over from experimenting several years ago but I have not more developer. Any ideas for a substitute for the original? Something simple?
  > > Thanks,
  > > 
  > > LeMar
  > >
  >



  

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