On Tue, 28 Feb 2012 20:06:25 -0600 Jon Elson <el...@pico-systems.com> wrote:
> dave wrote: > > If anyone is really desperate I think I still have some KPR (Kodak > > photoresist) around. IIRC ... vacuum pull down the photomask over > > the substrate (board) expose with UV. Develop with toluene. Etch. > > > > Since I'm a packrat (I'm obviously relate to Neotoma cinerea ) ;-) > > the KPR is tucked away someplace. It may have auto-polemerized. > > > Arrgh! Horrible stuff, horrible chemistry, terrible exposure control > and repeatability. > Use dry film resist, all aqueous processing with mild chemicals. > Vastly better > exposure control (I've used both, as you might tell from the above) > visible results after development so you know if the resist > expose/develop step went well before you try etching. Think and > Tinker sells it in small quantities, I > believe. > > Jon Sorry you had such bad luck with it. I diluted it IIRC 1:1 with toluene, floated in on the copper, drained off any that would run off, let it dry, exposed it with a very intense UV lamp. Developed with toluene and then etched. Never had one fail. The UV lamp was the nasty part of it (about 1 KW); we used it to convert diethylstibesterol to a colored compound that could be measured in a spectrophotometer; not something one usually has laying around. Aqueous based chemicals are probably a safer way for most people to go. I did this a LONG time ago and was not aware of any alternatives. Dave > > ------------------------------------------------------------------------------ > Virtualization & Cloud Management Using Capacity Planning > Cloud computing makes use of virtualization - but cloud computing > also focuses on allowing computing to be delivered as a service. > http://www.accelacomm.com/jaw/sfnl/114/51521223/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
