If I had to compare this resist to another product it would be the old
Kodak KPR resist. KPR was a solvent based photo resist that was
processed in a xylene based chemistry. I worked with KPR many years
ago and certainly don't miss it or the solvent fumes.
I still have an old DuPont Model C developing machine left over from
the old days. That's what we used to develop solvent based photo
resist coatings. Anyone who worked with KPR in the old days will agree
that it's nothing they miss!!
I think this new water based resist will catch on and become well
accepted. The hobby guy's will appreciate it because there is almost
no odor. It's a one part product with a long shelf life.
--- In Homebrew_PCBs@yahoogroups.com, "roel_cnc" <roel_cnc@...> wrote:
>
> --- In Homebrew_PCBs@yahoogroups.com, "twb8899" <twb8899@> wrote:
> >
> > Check out this ebay auction: 300065847043
> >
> > I had a very interesting telephone conversation today with Steve
> > Johnson who owns the company that makes this photoresist. Steve is
> > just getting this product off the ground after many years of research.
> > A water based photoresist is something the circuit board industry has
> > been waiting on for years. He said it was the only water based product
> > of this type on the market.
> >
> > There are NO solvents or VOC's in this product. Steve told me it has a
> > slight water based (latex) paint odor. This would be great for anyone
> > with a home based shop who doesn't want to put up with the stink of
> > dry film or solvent based products. It can be processed the same as
> > dry film resist after it dries.
> >
> > Development would be in a weak sodium carbonate (soda ash) solution.
> > Washing soda from the grocery store is soda ash. Make a 1% solution
> > with water. Approximately 1.25 ounces of the dry soda ash powder to
> > one gallon of warm water should work fine.
> >
> > Sodium hydroxide (lye) can be used to strip this resist after etching.
> > A 1 or 2% solution should work for stripping.
> >
> > I plan on using this resist for photo engraving stainless steel sheets
> > for a product I make. Steve said this material has better adhesion
> > properties than dry film. Resist adhesion has always been a problem
> > for me when processing stainless steel. I will use it for my circuit
> > board production as well. My plan is to use a simple dip coater for
> > applying the resist and drying it with an infra red heater panel.
> >
> > Something else to consider, this company also makes soldermask and
> > component legend products that exhibit the same fast exposure
> > properties. I have used liquid photo imaged soldermask for years and
> > if you don't have a high power exposure unit you aren't going to get
> > the job done. Those products take lots of UV power for proper
> > exposure. The way it looks, this new soldermask product will get a
> > complete exposure with much less power. This is a HUGE bonus for the
> > experimenter and home shop guys who don't have high power equipment.
> >
> > I will be testing this product in my shop very soon and plan to post
> > the results here. Hopefully others will do the same as I feel they
> > will obtain some first class boards by doing so.
> >
> > Steve Johnson told me he would welcome orders from anyone so don't
> > worry about being a hobbyist or home based shop. He wants to get this
> > product out there and I applaud him for accepting orders from
> > commercial and hobbyist users alike.
> >
> > I am not affiliated in any way with this company and only learned
> > about them today but I plan on being a regular customer and I hope
> > others will try it too.
> >
> > Tom
> >
>
> hi, as you describe the resist its most like screenprining emulsion
to me
> is it a two part product ! (sensitizer)
>
> i have it, but never tryet using it that way :)
>
> Gr Roel
>