KPR developer
2012-03-07 by lemar
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
Thread
KPR developer
Re: KPR developer
2012-03-08 by bebx2000
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:
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> > 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 >
Re: KPR developer
2012-03-09 by lemar
Thanks, I'll give that a try. Any idea what the shelf life is for KPR? --- In Homebrew_PCBs@yahoogroups.com, "bebx2000" <bebx2000@...> wrote:
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> > > > 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 > > >
Re: [Homebrew_PCBs] Re: KPR developer
2012-03-09 by John Anhalt
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
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----- 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
> >
>
[Non-text portions of this message have been removed]Re: [Homebrew_PCBs] KPR developer
2012-03-09 by VK3YV
Hi ,I used to use TRICHLORETHELENE for many years and it worked perfectly, but I don't think you can get it now, been banned. KPR is also no longer available either, Don ....VK3YV ----- Original Message -----
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From: "lemar" <doyle51241@...> To: <Homebrew_PCBs@yahoogroups.com> Sent: Thursday, March 08, 2012 4:37 AM Subject: [Homebrew_PCBs] KPR developer >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 > > > > ------------------------------------ > > Be sure to visit the group home and check for new Links, Files, and > Photos: > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links > > > >