Try contacting a local PCB fabricator and see if they will
sell you the last 10 meters off the dry film rolls, when
they next do a change over on the hot roll laminator. You
might like to cut it in 300x300mm squares for convenience,
then store in black plastic bag, in the fridge, and it will
last for many years.
As for the applying the film, I've finally got it worked
out. You need to get hold of a rubber roller like that from
ink printing machinery. Here, I took a few photos to show
basically what I use to put the film on the board and
process the photoresist. Excuse some of the poor quality
photos, I wasn't taking my time to do a better job.
http://members.optusnet.com.au/~eseychell/picturesThese two images show a magnified view of a pattern in the
photomask and the same pattern developed on the photoresist.
http://members.optusnet.com.au/~eseychell/pictures/Epson_inkjet_film.jpghttp://members.optusnet.com.au/~eseychell/pictures/resist_image_on_copper.jpgRon Amundson wrote:
> Since Kepro went out of business, I need to find a new supplier of
> presensized negative acting photoresist material . I tried some positive
> material from Injectorall, but can't seem to get a decent board from it. I'm
> sure it will work after I figure out the correct process, but that can get
> pretty expensive.
>
> Ideally I'd like to find some place that provides the same type of material
> as Kepro had. It was a 1.3mil thick laminated negative acting photoresist,
> Riston EM312 Photopolymer film made by Dupont. It was developed with sodium
> carbonate.
>
> Any ideas
> Ron
>