Re: [CAD_CAM_EDM_DRO] Re: making PC boards

dave engvall wrote:

>
> > I used to do boards with Kodak KPR using an intense UV lamp to
> polymerize the photoresist, then develop with toluene. Still have
> > some KPR if someone can't resist. :-)

Arrgh! I remember ALL TOO WELL the hassles of using KPR. It was VERY
touchy. The resist had low contrast, so any quality problems with the
master
films would make rotten boards. the exposure had to be just right, the
development
just right, and then you had to make the board etch real quick, or the
resist
punched through, and you got swiss cheese instead of solid copper.
The stink and hazards of the developer (111-triChloroEthylene) were
bad, too!

The Riston dry film resist is SO much better in about 5 different ways!
No toxic chemicals, the resist is tough as nails, never punches through,

has a VERY wide exposure latitude and wide development latitude.
You just can't lose with Riston.

All it took was one test with the dry film, I threw all my KPR stuff
out, and never looked back!

Jon